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SubjectRe: [PATCH v3 1/2] media: atmel: atmel-isc: split driver into driver base and isc
Hi Eugen,

Thanks for the patch.

On Thu, Jun 06, 2019 at 07:43:45AM +0000, Eugen.Hristev@microchip.com wrote:
> From: Eugen Hristev <eugen.hristev@microchip.com>
>
> This splits the Atmel ISC driver into a common base: atmel-isc-base.c
> and the driver probe/dt part , atmel-sama5d2-isc.c
> This is needed to keep a common ground for the sensor controller which will
> be reused.
> The atmel-isc will use the common symbols inside the atmel-isc-base
> Future driver will also use the same symbols and redefine different aspects,
> for a different version of the ISC.

I have to admit I had completely missed you had a little ISP there. :-)

Can you share at the moment whether the pipeline of the new device is more
complex than this one, with multiple outputs for instance?

> This is done to avoid complete code duplication by creating a totally
> different driver for the new variant of the ISC.
>
> Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
> ---
>
> Hello Hans,
>
> I created a subsequent patch that fixes the checkpatch issues. (2/2 in this
> series now).
>
> Thanks,
> Eugen
>
> Changes in v3:
> - Fixed up the externs, moved to header file
> - moved the module parameters to atmel-isc-base.c
>
> Changes in v2:
> - renamed atmel-isc.c to atmel-sama5d2-isc.c as sama5d2 is the SoC that
> includes this hardware block. The module will still be named atmel-isc.ko
> - removed ifdef around definition of ATMEL_ISC_NAME
> - moved external declarations in the specific files, this was breaking
> module loading
>
> MAINTAINERS | 4 +-
> drivers/media/platform/atmel/Makefile | 4 +-
> drivers/media/platform/atmel/atmel-isc-base.c | 2153 ++++++++++++++++++
> drivers/media/platform/atmel/atmel-isc.c | 2634 ----------------------
> drivers/media/platform/atmel/atmel-isc.h | 208 ++
> drivers/media/platform/atmel/atmel-sama5d2-isc.c | 344 +++
> 6 files changed, 2711 insertions(+), 2636 deletions(-)
> create mode 100644 drivers/media/platform/atmel/atmel-isc-base.c
> delete mode 100644 drivers/media/platform/atmel/atmel-isc.c
> create mode 100644 drivers/media/platform/atmel/atmel-isc.h
> create mode 100644 drivers/media/platform/atmel/atmel-sama5d2-isc.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 5cfbea4..3dc8289 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10270,7 +10270,9 @@ MICROCHIP ISC DRIVER
> M: Eugen Hristev <eugen.hristev@microchip.com>
> L: linux-media@vger.kernel.org
> S: Supported
> -F: drivers/media/platform/atmel/atmel-isc.c
> +F: drivers/media/platform/atmel/atmel-sama5d2-isc.c
> +F: drivers/media/platform/atmel/atmel-isc.h
> +F: drivers/media/platform/atmel/atmel-isc-base.c
> F: drivers/media/platform/atmel/atmel-isc-regs.h
> F: Documentation/devicetree/bindings/media/atmel-isc.txt
>
> diff --git a/drivers/media/platform/atmel/Makefile b/drivers/media/platform/atmel/Makefile
> index 27000d0..9462736 100644
> --- a/drivers/media/platform/atmel/Makefile
> +++ b/drivers/media/platform/atmel/Makefile
> @@ -1,2 +1,4 @@
> -obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel-isc.o
> +atmel-isc-objs = atmel-sama5d2-isc.o atmel-isc-base.o
> +
> obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel-isi.o
> +obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel-isc.o
> diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
> new file mode 100644
> index 0000000..e27e790
> --- /dev/null
> +++ b/drivers/media/platform/atmel/atmel-isc-base.c
> @@ -0,0 +1,2153 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Microchip Image Sensor Controller (ISC) common driver base
> + *
> + * Copyright (C) 2016-2019 Microchip Technology, Inc.
> + *
> + * Author: Songjun Wu <songjun.wu@microchip.com>
Is Songjun's e-mail still functional? I vaguely remember getting delivery
errors in the past. If it's not, please remove the e-mail address. Same on
MODULE_AUTHOR() at the end.

> + * Author: Eugen Hristev <eugen.hristev@microchip.com>
> + *
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/math64.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-image-sizes.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "atmel-isc-regs.h"
> +#include "atmel-isc.h"
> +
> +unsigned int debug;
> +module_param(debug, int, 0644);
> +MODULE_PARM_DESC(debug, "debug level (0-2)");
> +
> +unsigned int sensor_preferred = 1;
> +module_param(sensor_preferred, uint, 0644);
> +MODULE_PARM_DESC(sensor_preferred,
> + "Sensor is preferred to output the specified format (1-on 0-off), default 1");
> +
> +/* This is a list of the formats that the ISC can *output* */
> +struct isc_format controller_formats[] = {

const

> + {
> + .fourcc = V4L2_PIX_FMT_ARGB444,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_ARGB555,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_RGB565,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_ABGR32,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_XBGR32,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_YUV420,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_YUYV,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_YUV422P,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_GREY,
> + },
> +};
> +
> +/* This is a list of formats that the ISC can receive as *input* */
> +struct isc_format formats_list[] = {

const

> + {
> + .fourcc = V4L2_PIX_FMT_SBGGR8,
> + .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
> + .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> + .cfa_baycfg = ISC_BAY_CFG_BGBG,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SGBRG8,
> + .mbus_code = MEDIA_BUS_FMT_SGBRG8_1X8,
> + .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> + .cfa_baycfg = ISC_BAY_CFG_GBGB,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SGRBG8,
> + .mbus_code = MEDIA_BUS_FMT_SGRBG8_1X8,
> + .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> + .cfa_baycfg = ISC_BAY_CFG_GRGR,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SRGGB8,
> + .mbus_code = MEDIA_BUS_FMT_SRGGB8_1X8,
> + .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> + .cfa_baycfg = ISC_BAY_CFG_RGRG,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SBGGR10,
> + .mbus_code = MEDIA_BUS_FMT_SBGGR10_1X10,
> + .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TEN,
> + .cfa_baycfg = ISC_BAY_CFG_RGRG,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SGBRG10,
> + .mbus_code = MEDIA_BUS_FMT_SGBRG10_1X10,
> + .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TEN,
> + .cfa_baycfg = ISC_BAY_CFG_GBGB,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SGRBG10,
> + .mbus_code = MEDIA_BUS_FMT_SGRBG10_1X10,
> + .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TEN,
> + .cfa_baycfg = ISC_BAY_CFG_GRGR,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SRGGB10,
> + .mbus_code = MEDIA_BUS_FMT_SRGGB10_1X10,
> + .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TEN,
> + .cfa_baycfg = ISC_BAY_CFG_RGRG,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SBGGR12,
> + .mbus_code = MEDIA_BUS_FMT_SBGGR12_1X12,
> + .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TWELVE,
> + .cfa_baycfg = ISC_BAY_CFG_BGBG,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SGBRG12,
> + .mbus_code = MEDIA_BUS_FMT_SGBRG12_1X12,
> + .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TWELVE,
> + .cfa_baycfg = ISC_BAY_CFG_GBGB,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SGRBG12,
> + .mbus_code = MEDIA_BUS_FMT_SGRBG12_1X12,
> + .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TWELVE,
> + .cfa_baycfg = ISC_BAY_CFG_GRGR,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_SRGGB12,
> + .mbus_code = MEDIA_BUS_FMT_SRGGB12_1X12,
> + .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TWELVE,
> + .cfa_baycfg = ISC_BAY_CFG_RGRG,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_GREY,
> + .mbus_code = MEDIA_BUS_FMT_Y8_1X8,
> + .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_YUYV,
> + .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
> + .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> + },
> + {
> + .fourcc = V4L2_PIX_FMT_RGB565,
> + .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
> + .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> + },
> +};
> +
> +/* Gamma table with gamma 1/2.2 */
> +const u32 isc_gamma_table[GAMMA_MAX + 1][GAMMA_ENTRIES] = {

Can this be static?

> + /* 0 --> gamma 1/1.8 */
> + { 0x65, 0x66002F, 0x950025, 0xBB0020, 0xDB001D, 0xF8001A,
> + 0x1130018, 0x12B0017, 0x1420016, 0x1580014, 0x16D0013, 0x1810012,
> + 0x1940012, 0x1A60012, 0x1B80011, 0x1C90010, 0x1DA0010, 0x1EA000F,
> + 0x1FA000F, 0x209000F, 0x218000F, 0x227000E, 0x235000E, 0x243000E,
> + 0x251000E, 0x25F000D, 0x26C000D, 0x279000D, 0x286000D, 0x293000C,
> + 0x2A0000C, 0x2AC000C, 0x2B8000C, 0x2C4000C, 0x2D0000B, 0x2DC000B,
> + 0x2E7000B, 0x2F3000B, 0x2FE000B, 0x309000B, 0x314000B, 0x31F000A,
> + 0x32A000A, 0x334000B, 0x33F000A, 0x349000A, 0x354000A, 0x35E000A,
> + 0x368000A, 0x372000A, 0x37C000A, 0x386000A, 0x3900009, 0x399000A,
> + 0x3A30009, 0x3AD0009, 0x3B60009, 0x3BF000A, 0x3C90009, 0x3D20009,
> + 0x3DB0009, 0x3E40009, 0x3ED0009, 0x3F60009 },
> +
> + /* 1 --> gamma 1/2 */
> + { 0x7F, 0x800034, 0xB50028, 0xDE0021, 0x100001E, 0x11E001B,
> + 0x1390019, 0x1520017, 0x16A0015, 0x1800014, 0x1940014, 0x1A80013,
> + 0x1BB0012, 0x1CD0011, 0x1DF0010, 0x1EF0010, 0x200000F, 0x20F000F,
> + 0x21F000E, 0x22D000F, 0x23C000E, 0x24A000E, 0x258000D, 0x265000D,
> + 0x273000C, 0x27F000D, 0x28C000C, 0x299000C, 0x2A5000C, 0x2B1000B,
> + 0x2BC000C, 0x2C8000B, 0x2D3000C, 0x2DF000B, 0x2EA000A, 0x2F5000A,
> + 0x2FF000B, 0x30A000A, 0x314000B, 0x31F000A, 0x329000A, 0x333000A,
> + 0x33D0009, 0x3470009, 0x350000A, 0x35A0009, 0x363000A, 0x36D0009,
> + 0x3760009, 0x37F0009, 0x3880009, 0x3910009, 0x39A0009, 0x3A30009,
> + 0x3AC0008, 0x3B40009, 0x3BD0008, 0x3C60008, 0x3CE0008, 0x3D60009,
> + 0x3DF0008, 0x3E70008, 0x3EF0008, 0x3F70008 },
> +
> + /* 2 --> gamma 1/2.2 */
> + { 0x99, 0x9B0038, 0xD4002A, 0xFF0023, 0x122001F, 0x141001B,
> + 0x15D0019, 0x1760017, 0x18E0015, 0x1A30015, 0x1B80013, 0x1CC0012,
> + 0x1DE0011, 0x1F00010, 0x2010010, 0x2110010, 0x221000F, 0x230000F,
> + 0x23F000E, 0x24D000E, 0x25B000D, 0x269000C, 0x276000C, 0x283000C,
> + 0x28F000C, 0x29B000C, 0x2A7000C, 0x2B3000B, 0x2BF000B, 0x2CA000B,
> + 0x2D5000B, 0x2E0000A, 0x2EB000A, 0x2F5000A, 0x2FF000A, 0x30A000A,
> + 0x3140009, 0x31E0009, 0x327000A, 0x3310009, 0x33A0009, 0x3440009,
> + 0x34D0009, 0x3560009, 0x35F0009, 0x3680008, 0x3710008, 0x3790009,
> + 0x3820008, 0x38A0008, 0x3930008, 0x39B0008, 0x3A30008, 0x3AB0008,
> + 0x3B30008, 0x3BB0008, 0x3C30008, 0x3CB0007, 0x3D20008, 0x3DA0007,
> + 0x3E20007, 0x3E90007, 0x3F00008, 0x3F80007 },
> +};
> +
> +#define ISC_IS_FORMAT_RAW(mbus_code) \
> + (((mbus_code) & 0xf000) == 0x3000)
> +
> +static inline void isc_update_awb_ctrls(struct isc_device *isc)
> +{
> + struct isc_ctrls *ctrls = &isc->ctrls;
> +
> + regmap_write(isc->regmap, ISC_WB_O_RGR,
> + (ISC_WB_O_ZERO_VAL - (ctrls->offset[ISC_HIS_CFG_MODE_R])) |
> + ((ISC_WB_O_ZERO_VAL - ctrls->offset[ISC_HIS_CFG_MODE_GR]) << 16));
> + regmap_write(isc->regmap, ISC_WB_O_BGB,
> + (ISC_WB_O_ZERO_VAL - (ctrls->offset[ISC_HIS_CFG_MODE_B])) |
> + ((ISC_WB_O_ZERO_VAL - ctrls->offset[ISC_HIS_CFG_MODE_GB]) << 16));
> + regmap_write(isc->regmap, ISC_WB_G_RGR,
> + ctrls->gain[ISC_HIS_CFG_MODE_R] |
> + (ctrls->gain[ISC_HIS_CFG_MODE_GR] << 16));
> + regmap_write(isc->regmap, ISC_WB_G_BGB,
> + ctrls->gain[ISC_HIS_CFG_MODE_B] |
> + (ctrls->gain[ISC_HIS_CFG_MODE_GB] << 16));
> +}
> +
> +static inline void isc_reset_awb_ctrls(struct isc_device *isc)
> +{
> + int c;

unsigned int

> +
> + for (c = ISC_HIS_CFG_MODE_GR; c <= ISC_HIS_CFG_MODE_B; c++) {
> + /* gains have a fixed point at 9 decimals */
> + isc->ctrls.gain[c] = 1 << 9;
> + /* offsets are in 2's complements, the value
> + * will be substracted from ISC_WB_O_ZERO_VAL to obtain
> + * 2's complement of a value between 0 and
> + * ISC_WB_O_ZERO_VAL >> 1
> + */
> + isc->ctrls.offset[c] = ISC_WB_O_ZERO_VAL;
> + }
> +}
> +
> +static int isc_wait_clk_stable(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + struct regmap *regmap = isc_clk->regmap;
> + unsigned long timeout = jiffies + usecs_to_jiffies(1000);
> + unsigned int status;
> +
> + while (time_before(jiffies, timeout)) {
> + regmap_read(regmap, ISC_CLKSR, &status);
> + if (!(status & ISC_CLKSR_SIP))
> + return 0;
> +
> + usleep_range(10, 250);
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +static int isc_clk_prepare(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> +
> + if (isc_clk->id == ISC_ISPCK)
> + pm_runtime_get_sync(isc_clk->dev);
> +
> + return isc_wait_clk_stable(hw);
> +}
> +
> +static void isc_clk_unprepare(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> +
> + isc_wait_clk_stable(hw);
> +
> + if (isc_clk->id == ISC_ISPCK)
> + pm_runtime_put_sync(isc_clk->dev);
> +}
> +
> +static int isc_clk_enable(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + u32 id = isc_clk->id;
> + struct regmap *regmap = isc_clk->regmap;
> + unsigned long flags;
> + unsigned int status;
> +
> + dev_dbg(isc_clk->dev, "ISC CLK: %s, div = %d, parent id = %d\n",
> + __func__, isc_clk->div, isc_clk->parent_id);
> +
> + spin_lock_irqsave(&isc_clk->lock, flags);
> + regmap_update_bits(regmap, ISC_CLKCFG,
> + ISC_CLKCFG_DIV_MASK(id) | ISC_CLKCFG_SEL_MASK(id),
> + (isc_clk->div << ISC_CLKCFG_DIV_SHIFT(id)) |
> + (isc_clk->parent_id << ISC_CLKCFG_SEL_SHIFT(id)));
> +
> + regmap_write(regmap, ISC_CLKEN, ISC_CLK(id));
> + spin_unlock_irqrestore(&isc_clk->lock, flags);
> +
> + regmap_read(regmap, ISC_CLKSR, &status);
> + if (status & ISC_CLK(id))
> + return 0;
> + else
> + return -EINVAL;
> +}
> +
> +static void isc_clk_disable(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + u32 id = isc_clk->id;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&isc_clk->lock, flags);
> + regmap_write(isc_clk->regmap, ISC_CLKDIS, ISC_CLK(id));
> + spin_unlock_irqrestore(&isc_clk->lock, flags);
> +}
> +
> +static int isc_clk_is_enabled(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + u32 status;
> +
> + if (isc_clk->id == ISC_ISPCK)
> + pm_runtime_get_sync(isc_clk->dev);
> +
> + regmap_read(isc_clk->regmap, ISC_CLKSR, &status);
> +
> + if (isc_clk->id == ISC_ISPCK)
> + pm_runtime_put_sync(isc_clk->dev);
> +
> + return status & ISC_CLK(isc_clk->id) ? 1 : 0;
> +}
> +
> +static unsigned long
> +isc_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> +
> + return DIV_ROUND_CLOSEST(parent_rate, isc_clk->div + 1);
> +}
> +
> +static int isc_clk_determine_rate(struct clk_hw *hw,
> + struct clk_rate_request *req)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + long best_rate = -EINVAL;
> + int best_diff = -1;
> + unsigned int i, div;
> +
> + for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
> + struct clk_hw *parent;
> + unsigned long parent_rate;
> +
> + parent = clk_hw_get_parent_by_index(hw, i);
> + if (!parent)
> + continue;
> +
> + parent_rate = clk_hw_get_rate(parent);
> + if (!parent_rate)
> + continue;
> +
> + for (div = 1; div < ISC_CLK_MAX_DIV + 2; div++) {
> + unsigned long rate;
> + int diff;
> +
> + rate = DIV_ROUND_CLOSEST(parent_rate, div);
> + diff = abs(req->rate - rate);
> +
> + if (best_diff < 0 || best_diff > diff) {
> + best_rate = rate;
> + best_diff = diff;
> + req->best_parent_rate = parent_rate;
> + req->best_parent_hw = parent;
> + }
> +
> + if (!best_diff || rate < req->rate)
> + break;
> + }
> +
> + if (!best_diff)
> + break;
> + }
> +
> + dev_dbg(isc_clk->dev,
> + "ISC CLK: %s, best_rate = %ld, parent clk: %s @ %ld\n",
> + __func__, best_rate,
> + __clk_get_name((req->best_parent_hw)->clk),
> + req->best_parent_rate);
> +
> + if (best_rate < 0)
> + return best_rate;
> +
> + req->rate = best_rate;
> +
> + return 0;
> +}
> +
> +static int isc_clk_set_parent(struct clk_hw *hw, u8 index)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> +
> + if (index >= clk_hw_get_num_parents(hw))
> + return -EINVAL;
> +
> + isc_clk->parent_id = index;
> +
> + return 0;
> +}
> +
> +static u8 isc_clk_get_parent(struct clk_hw *hw)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> +
> + return isc_clk->parent_id;
> +}
> +
> +static int isc_clk_set_rate(struct clk_hw *hw,
> + unsigned long rate,
> + unsigned long parent_rate)
> +{
> + struct isc_clk *isc_clk = to_isc_clk(hw);
> + u32 div;
> +
> + if (!rate)
> + return -EINVAL;
> +
> + div = DIV_ROUND_CLOSEST(parent_rate, rate);
> + if (div > (ISC_CLK_MAX_DIV + 1) || !div)
> + return -EINVAL;
> +
> + isc_clk->div = div - 1;
> +
> + return 0;
> +}
> +
> +static const struct clk_ops isc_clk_ops = {
> + .prepare = isc_clk_prepare,
> + .unprepare = isc_clk_unprepare,
> + .enable = isc_clk_enable,
> + .disable = isc_clk_disable,
> + .is_enabled = isc_clk_is_enabled,
> + .recalc_rate = isc_clk_recalc_rate,
> + .determine_rate = isc_clk_determine_rate,
> + .set_parent = isc_clk_set_parent,
> + .get_parent = isc_clk_get_parent,
> + .set_rate = isc_clk_set_rate,
> +};
> +
> +static int isc_clk_register(struct isc_device *isc, unsigned int id)
> +{
> + struct regmap *regmap = isc->regmap;
> + struct device_node *np = isc->dev->of_node;
> + struct isc_clk *isc_clk;
> + struct clk_init_data init;
> + const char *clk_name = np->name;
> + const char *parent_names[3];
> + int num_parents;
> +
> + num_parents = of_clk_get_parent_count(np);
> + if (num_parents < 1 || num_parents > 3)
> + return -EINVAL;
> +
> + if (num_parents > 2 && id == ISC_ISPCK)
> + num_parents = 2;
> +
> + of_clk_parent_fill(np, parent_names, num_parents);
> +
> + if (id == ISC_MCK)
> + of_property_read_string(np, "clock-output-names", &clk_name);
> + else
> + clk_name = "isc-ispck";
> +
> + init.parent_names = parent_names;
> + init.num_parents = num_parents;
> + init.name = clk_name;
> + init.ops = &isc_clk_ops;
> + init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
> +
> + isc_clk = &isc->isc_clks[id];
> + isc_clk->hw.init = &init;
> + isc_clk->regmap = regmap;
> + isc_clk->id = id;
> + isc_clk->dev = isc->dev;
> + spin_lock_init(&isc_clk->lock);
> +
> + isc_clk->clk = clk_register(isc->dev, &isc_clk->hw);
> + if (IS_ERR(isc_clk->clk)) {
> + dev_err(isc->dev, "%s: clock register fail\n", clk_name);
> + return PTR_ERR(isc_clk->clk);
> + } else if (id == ISC_MCK)
> + of_clk_add_provider(np, of_clk_src_simple_get, isc_clk->clk);
> +
> + return 0;
> +}
> +
> +int isc_clk_init(struct isc_device *isc)
> +{
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++)
> + isc->isc_clks[i].clk = ERR_PTR(-EINVAL);
> +
> + for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
> + ret = isc_clk_register(isc, i);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +void isc_clk_cleanup(struct isc_device *isc)
> +{
> + unsigned int i;
> +
> + of_clk_del_provider(isc->dev->of_node);
> +
> + for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
> + struct isc_clk *isc_clk = &isc->isc_clks[i];
> +
> + if (!IS_ERR(isc_clk->clk))
> + clk_unregister(isc_clk->clk);
> + }
> +}
> +
> +static int isc_queue_setup(struct vb2_queue *vq,
> + unsigned int *nbuffers, unsigned int *nplanes,
> + unsigned int sizes[], struct device *alloc_devs[])
> +{
> + struct isc_device *isc = vb2_get_drv_priv(vq);
> + unsigned int size = isc->fmt.fmt.pix.sizeimage;
> +
> + if (*nplanes)
> + return sizes[0] < size ? -EINVAL : 0;
> +
> + *nplanes = 1;
> + sizes[0] = size;
> +
> + return 0;
> +}
> +
> +static int isc_buffer_prepare(struct vb2_buffer *vb)
> +{
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct isc_device *isc = vb2_get_drv_priv(vb->vb2_queue);
> + unsigned long size = isc->fmt.fmt.pix.sizeimage;
> +
> + if (vb2_plane_size(vb, 0) < size) {
> + v4l2_err(&isc->v4l2_dev, "buffer too small (%lu < %lu)\n",
> + vb2_plane_size(vb, 0), size);
> + return -EINVAL;
> + }
> +
> + vb2_set_plane_payload(vb, 0, size);
> +
> + vbuf->field = isc->fmt.fmt.pix.field;
> +
> + return 0;
> +}
> +
> +static void isc_start_dma(struct isc_device *isc)
> +{
> + struct regmap *regmap = isc->regmap;
> + u32 sizeimage = isc->fmt.fmt.pix.sizeimage;
> + u32 dctrl_dview;
> + dma_addr_t addr0;
> + u32 h, w;
> +
> + h = isc->fmt.fmt.pix.height;
> + w = isc->fmt.fmt.pix.width;
> +
> + /*
> + * In case the sensor is not RAW, it will output a pixel (12-16 bits)
> + * with two samples on the ISC Data bus (which is 8-12)
> + * ISC will count each sample, so, we need to multiply these values
> + * by two, to get the real number of samples for the required pixels.
> + */
> + if (!ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code)) {
> + h <<= 1;
> + w <<= 1;
> + }
> +
> + /*
> + * We limit the column/row count that the ISC will output according
> + * to the configured resolution that we want.
> + * This will avoid the situation where the sensor is misconfigured,
> + * sending more data, and the ISC will just take it and DMA to memory,
> + * causing corruption.
> + */
> + regmap_write(regmap, ISC_PFE_CFG1,
> + (ISC_PFE_CFG1_COLMIN(0) & ISC_PFE_CFG1_COLMIN_MASK) |
> + (ISC_PFE_CFG1_COLMAX(w - 1) & ISC_PFE_CFG1_COLMAX_MASK));
> +
> + regmap_write(regmap, ISC_PFE_CFG2,
> + (ISC_PFE_CFG2_ROWMIN(0) & ISC_PFE_CFG2_ROWMIN_MASK) |
> + (ISC_PFE_CFG2_ROWMAX(h - 1) & ISC_PFE_CFG2_ROWMAX_MASK));
> +
> + regmap_update_bits(regmap, ISC_PFE_CFG0,
> + ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN,
> + ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN);
> +
> + addr0 = vb2_dma_contig_plane_dma_addr(&isc->cur_frm->vb.vb2_buf, 0);
> + regmap_write(regmap, ISC_DAD0, addr0);
> +
> + switch (isc->config.fourcc) {
> + case V4L2_PIX_FMT_YUV420:
> + regmap_write(regmap, ISC_DAD1, addr0 + (sizeimage * 2) / 3);
> + regmap_write(regmap, ISC_DAD2, addr0 + (sizeimage * 5) / 6);
> + break;
> + case V4L2_PIX_FMT_YUV422P:
> + regmap_write(regmap, ISC_DAD1, addr0 + sizeimage / 2);
> + regmap_write(regmap, ISC_DAD2, addr0 + (sizeimage * 3) / 4);
> + break;
> + default:
> + break;
> + }
> +
> + dctrl_dview = isc->config.dctrl_dview;
> +
> + regmap_write(regmap, ISC_DCTRL, dctrl_dview | ISC_DCTRL_IE_IS);
> + spin_lock(&isc->awb_lock);
> + regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_CAPTURE);
> + spin_unlock(&isc->awb_lock);
> +}
> +
> +static void isc_set_pipeline(struct isc_device *isc, u32 pipeline)
> +{
> + struct regmap *regmap = isc->regmap;
> + struct isc_ctrls *ctrls = &isc->ctrls;
> + u32 val, bay_cfg;
> + const u32 *gamma;
> + unsigned int i;
> +
> + /* WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB422-->SUB420 */
> + for (i = 0; i < ISC_PIPE_LINE_NODE_NUM; i++) {
> + val = pipeline & BIT(i) ? 1 : 0;
> + regmap_field_write(isc->pipeline[i], val);
> + }
> +
> + if (!pipeline)
> + return;
> +
> + bay_cfg = isc->config.sd_format->cfa_baycfg;
> +
> + if (ctrls->awb == ISC_WB_NONE)
> + isc_reset_awb_ctrls(isc);
> +
> + regmap_write(regmap, ISC_WB_CFG, bay_cfg);
> + isc_update_awb_ctrls(isc);
> +
> + regmap_write(regmap, ISC_CFA_CFG, bay_cfg | ISC_CFA_CFG_EITPOL);
> +
> + gamma = &isc_gamma_table[ctrls->gamma_index][0];
> + regmap_bulk_write(regmap, ISC_GAM_BENTRY, gamma, GAMMA_ENTRIES);
> + regmap_bulk_write(regmap, ISC_GAM_GENTRY, gamma, GAMMA_ENTRIES);
> + regmap_bulk_write(regmap, ISC_GAM_RENTRY, gamma, GAMMA_ENTRIES);
> +
> + /* Convert RGB to YUV */
> + regmap_write(regmap, ISC_CSC_YR_YG, 0x42 | (0x81 << 16));
> + regmap_write(regmap, ISC_CSC_YB_OY, 0x19 | (0x10 << 16));
> + regmap_write(regmap, ISC_CSC_CBR_CBG, 0xFDA | (0xFB6 << 16));
> + regmap_write(regmap, ISC_CSC_CBB_OCB, 0x70 | (0x80 << 16));
> + regmap_write(regmap, ISC_CSC_CRR_CRG, 0x70 | (0xFA2 << 16));
> + regmap_write(regmap, ISC_CSC_CRB_OCR, 0xFEE | (0x80 << 16));
> +
> + regmap_write(regmap, ISC_CBC_BRIGHT, ctrls->brightness);
> + regmap_write(regmap, ISC_CBC_CONTRAST, ctrls->contrast);
> +}
> +
> +static int isc_update_profile(struct isc_device *isc)
> +{
> + struct regmap *regmap = isc->regmap;
> + u32 sr;
> + int counter = 100;
> +
> + regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_UPPRO);
> +
> + regmap_read(regmap, ISC_CTRLSR, &sr);
> + while ((sr & ISC_CTRL_UPPRO) && counter--) {
> + usleep_range(1000, 2000);
> + regmap_read(regmap, ISC_CTRLSR, &sr);
> + }
> +
> + if (counter < 0) {
> + v4l2_warn(&isc->v4l2_dev, "Time out to update profile\n");
> + return -ETIMEDOUT;
> + }
> +
> + return 0;
> +}
> +
> +static void isc_set_histogram(struct isc_device *isc, bool enable)
> +{
> + struct regmap *regmap = isc->regmap;
> + struct isc_ctrls *ctrls = &isc->ctrls;
> +
> + if (enable) {
> + regmap_write(regmap, ISC_HIS_CFG,
> + ISC_HIS_CFG_MODE_GR |
> + (isc->config.sd_format->cfa_baycfg
> + << ISC_HIS_CFG_BAYSEL_SHIFT) |
> + ISC_HIS_CFG_RAR);
> + regmap_write(regmap, ISC_HIS_CTRL, ISC_HIS_CTRL_EN);
> + regmap_write(regmap, ISC_INTEN, ISC_INT_HISDONE);
> + ctrls->hist_id = ISC_HIS_CFG_MODE_GR;
> + isc_update_profile(isc);
> + regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_HISREQ);
> +
> + ctrls->hist_stat = HIST_ENABLED;
> + } else {
> + regmap_write(regmap, ISC_INTDIS, ISC_INT_HISDONE);
> + regmap_write(regmap, ISC_HIS_CTRL, ISC_HIS_CTRL_DIS);
> +
> + ctrls->hist_stat = HIST_DISABLED;
> + }
> +}
> +
> +static int isc_configure(struct isc_device *isc)
> +{
> + struct regmap *regmap = isc->regmap;
> + u32 pfe_cfg0, rlp_mode, dcfg, mask, pipeline;
> + struct isc_subdev_entity *subdev = isc->current_subdev;
> +
> + pfe_cfg0 = isc->config.sd_format->pfe_cfg0_bps;
> + rlp_mode = isc->config.rlp_cfg_mode;
> + pipeline = isc->config.bits_pipeline;
> +
> + dcfg = isc->config.dcfg_imode |
> + ISC_DCFG_YMBSIZE_BEATS8 | ISC_DCFG_CMBSIZE_BEATS8;
> +
> + pfe_cfg0 |= subdev->pfe_cfg0 | ISC_PFE_CFG0_MODE_PROGRESSIVE;
> + mask = ISC_PFE_CFG0_BPS_MASK | ISC_PFE_CFG0_HPOL_LOW |
> + ISC_PFE_CFG0_VPOL_LOW | ISC_PFE_CFG0_PPOL_LOW |
> + ISC_PFE_CFG0_MODE_MASK | ISC_PFE_CFG0_CCIR_CRC |
> + ISC_PFE_CFG0_CCIR656;
> +
> + regmap_update_bits(regmap, ISC_PFE_CFG0, mask, pfe_cfg0);
> +
> + regmap_update_bits(regmap, ISC_RLP_CFG, ISC_RLP_CFG_MODE_MASK,
> + rlp_mode);
> +
> + regmap_write(regmap, ISC_DCFG, dcfg);
> +
> + /* Set the pipeline */
> + isc_set_pipeline(isc, pipeline);
> +
> + /*
> + * The current implemented histogram is available for RAW R, B, GB, GR
> + * channels. We need to check if sensor is outputting RAW BAYER
> + */
> + if (isc->ctrls.awb &&
> + ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
> + isc_set_histogram(isc, true);
> + else
> + isc_set_histogram(isc, false);
> +
> + /* Update profile */
> + return isc_update_profile(isc);
> +}
> +
> +static int isc_start_streaming(struct vb2_queue *vq, unsigned int count)
> +{
> + struct isc_device *isc = vb2_get_drv_priv(vq);
> + struct regmap *regmap = isc->regmap;
> + struct isc_buffer *buf;
> + unsigned long flags;
> + int ret;
> +
> + /* Enable stream on the sub device */
> + ret = v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 1);
> + if (ret && ret != -ENOIOCTLCMD) {
> + v4l2_err(&isc->v4l2_dev, "stream on failed in subdev %d\n",
> + ret);
> + goto err_start_stream;
> + }
> +
> + pm_runtime_get_sync(isc->dev);
> +
> + ret = isc_configure(isc);
> + if (unlikely(ret))
> + goto err_configure;
> +
> + /* Enable DMA interrupt */
> + regmap_write(regmap, ISC_INTEN, ISC_INT_DDONE);
> +
> + spin_lock_irqsave(&isc->dma_queue_lock, flags);
> +
> + isc->sequence = 0;
> + isc->stop = false;
> + reinit_completion(&isc->comp);
> +
> + isc->cur_frm = list_first_entry(&isc->dma_queue,
> + struct isc_buffer, list);
> + list_del(&isc->cur_frm->list);
> +
> + isc_start_dma(isc);
> +
> + spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
> +
> + /* if we streaming from RAW, we can do one-shot white balance adj */
> + if (ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
> + v4l2_ctrl_activate(isc->do_wb_ctrl, true);
> +
> + return 0;
> +
> +err_configure:
> + pm_runtime_put_sync(isc->dev);
> +
> + v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
> +
> +err_start_stream:
> + spin_lock_irqsave(&isc->dma_queue_lock, flags);
> + list_for_each_entry(buf, &isc->dma_queue, list)
> + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
> + INIT_LIST_HEAD(&isc->dma_queue);
> + spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
> +
> + return ret;
> +}
> +
> +static void isc_stop_streaming(struct vb2_queue *vq)
> +{
> + struct isc_device *isc = vb2_get_drv_priv(vq);
> + unsigned long flags;
> + struct isc_buffer *buf;
> + int ret;
> +
> + v4l2_ctrl_activate(isc->do_wb_ctrl, false);
> +
> + isc->stop = true;
> +
> + /* Wait until the end of the current frame */
> + if (isc->cur_frm && !wait_for_completion_timeout(&isc->comp, 5 * HZ))
> + v4l2_err(&isc->v4l2_dev,
> + "Timeout waiting for end of the capture\n");
> +
> + /* Disable DMA interrupt */
> + regmap_write(isc->regmap, ISC_INTDIS, ISC_INT_DDONE);
> +
> + pm_runtime_put_sync(isc->dev);
> +
> + /* Disable stream on the sub device */
> + ret = v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
> + if (ret && ret != -ENOIOCTLCMD)
> + v4l2_err(&isc->v4l2_dev, "stream off failed in subdev\n");
> +
> + /* Release all active buffers */
> + spin_lock_irqsave(&isc->dma_queue_lock, flags);
> + if (unlikely(isc->cur_frm)) {
> + vb2_buffer_done(&isc->cur_frm->vb.vb2_buf,
> + VB2_BUF_STATE_ERROR);
> + isc->cur_frm = NULL;
> + }
> + list_for_each_entry(buf, &isc->dma_queue, list)
> + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> + INIT_LIST_HEAD(&isc->dma_queue);
> + spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
> +}
> +
> +static void isc_buffer_queue(struct vb2_buffer *vb)
> +{
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct isc_buffer *buf = container_of(vbuf, struct isc_buffer, vb);
> + struct isc_device *isc = vb2_get_drv_priv(vb->vb2_queue);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&isc->dma_queue_lock, flags);
> + if (!isc->cur_frm && list_empty(&isc->dma_queue) &&
> + vb2_is_streaming(vb->vb2_queue)) {
> + isc->cur_frm = buf;
> + isc_start_dma(isc);
> + } else
> + list_add_tail(&buf->list, &isc->dma_queue);
> + spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
> +}
> +
> +static struct isc_format *find_format_by_fourcc(struct isc_device *isc,
> + unsigned int fourcc)
> +{
> + unsigned int num_formats = isc->num_user_formats;
> + struct isc_format *fmt;
> + unsigned int i;
> +
> + for (i = 0; i < num_formats; i++) {
> + fmt = isc->user_formats[i];
> + if (fmt->fourcc == fourcc)
> + return fmt;
> + }
> +
> + return NULL;
> +}
> +
> +static const struct vb2_ops isc_vb2_ops = {
> + .queue_setup = isc_queue_setup,
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> + .buf_prepare = isc_buffer_prepare,
> + .start_streaming = isc_start_streaming,
> + .stop_streaming = isc_stop_streaming,
> + .buf_queue = isc_buffer_queue,
> +};
> +
> +static int isc_querycap(struct file *file, void *priv,
> + struct v4l2_capability *cap)
> +{
> + struct isc_device *isc = video_drvdata(file);
> +
> + strscpy(cap->driver, ATMEL_ISC_NAME, sizeof(cap->driver));
> + strscpy(cap->card, "Atmel Image Sensor Controller", sizeof(cap->card));
> + snprintf(cap->bus_info, sizeof(cap->bus_info),
> + "platform:%s", isc->v4l2_dev.name);
> +
> + return 0;
> +}
> +
> +static int isc_enum_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_fmtdesc *f)
> +{
> + u32 index = f->index;
> + u32 i, supported_index;
> +
> + if (index < ARRAY_SIZE(controller_formats)) {
> + f->pixelformat = controller_formats[index].fourcc;
> + return 0;
> + }
> +
> + index -= ARRAY_SIZE(controller_formats);
> +
> + i = 0;
> + supported_index = 0;
> +
> + for (i = 0; i < ARRAY_SIZE(formats_list); i++) {
> + if (!ISC_IS_FORMAT_RAW(formats_list[i].mbus_code) ||
> + !formats_list[i].sd_support)
> + continue;
> + if (supported_index == index) {
> + f->pixelformat = formats_list[i].fourcc;
> + return 0;
> + }
> + supported_index++;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int isc_g_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *fmt)
> +{
> + struct isc_device *isc = video_drvdata(file);
> +
> + *fmt = isc->fmt;
> +
> + return 0;
> +}
> +
> +/*
> + * Checks the current configured format, if ISC can output it,
> + * considering which type of format the ISC receives from the sensor
> + */
> +static int isc_try_validate_formats(struct isc_device *isc)
> +{
> + int ret;
> + bool bayer = false, yuv = false, rgb = false, grey = false;
> +
> + /* all formats supported by the RLP module are OK */
> + switch (isc->try_config.fourcc) {
> + case V4L2_PIX_FMT_SBGGR8:
> + case V4L2_PIX_FMT_SGBRG8:
> + case V4L2_PIX_FMT_SGRBG8:
> + case V4L2_PIX_FMT_SRGGB8:
> + case V4L2_PIX_FMT_SBGGR10:
> + case V4L2_PIX_FMT_SGBRG10:
> + case V4L2_PIX_FMT_SGRBG10:
> + case V4L2_PIX_FMT_SRGGB10:
> + case V4L2_PIX_FMT_SBGGR12:
> + case V4L2_PIX_FMT_SGBRG12:
> + case V4L2_PIX_FMT_SGRBG12:
> + case V4L2_PIX_FMT_SRGGB12:
> + ret = 0;
> + bayer = true;
> + break;
> +
> + case V4L2_PIX_FMT_YUV420:
> + case V4L2_PIX_FMT_YUV422P:
> + case V4L2_PIX_FMT_YUYV:
> + ret = 0;
> + yuv = true;
> + break;
> +
> + case V4L2_PIX_FMT_RGB565:
> + case V4L2_PIX_FMT_ABGR32:
> + case V4L2_PIX_FMT_XBGR32:
> + case V4L2_PIX_FMT_ARGB444:
> + case V4L2_PIX_FMT_ARGB555:
> + ret = 0;
> + rgb = true;
> + break;
> + case V4L2_PIX_FMT_GREY:
> + ret = 0;
> + grey = true;
> + break;
> + default:
> + /* any other different formats are not supported */
> + ret = -EINVAL;
> + }
> +
> + /* we cannot output RAW/Grey if we do not receive RAW */
> + if ((bayer || grey) &&
> + !ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code))
> + return -EINVAL;
> +
> + v4l2_dbg(1, debug, &isc->v4l2_dev,
> + "Format validation, requested rgb=%u, yuv=%u, grey=%u, bayer=%u\n",
> + rgb, yuv, grey, bayer);
> +
> + return ret;
> +}
> +
> +/*
> + * Configures the RLP and DMA modules, depending on the output format
> + * configured for the ISC.
> + * If direct_dump == true, just dump raw data 8 bits.
> + */
> +static int isc_try_configure_rlp_dma(struct isc_device *isc, bool direct_dump)
> +{
> + if (direct_dump) {
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT8;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 16;
> + return 0;
> + }
> +
> + switch (isc->try_config.fourcc) {
> + case V4L2_PIX_FMT_SBGGR8:
> + case V4L2_PIX_FMT_SGBRG8:
> + case V4L2_PIX_FMT_SGRBG8:
> + case V4L2_PIX_FMT_SRGGB8:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT8;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 8;
> + break;
> + case V4L2_PIX_FMT_SBGGR10:
> + case V4L2_PIX_FMT_SGBRG10:
> + case V4L2_PIX_FMT_SGRBG10:
> + case V4L2_PIX_FMT_SRGGB10:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT10;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 16;
> + break;
> + case V4L2_PIX_FMT_SBGGR12:
> + case V4L2_PIX_FMT_SGBRG12:
> + case V4L2_PIX_FMT_SGRBG12:
> + case V4L2_PIX_FMT_SRGGB12:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT12;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 16;
> + break;
> + case V4L2_PIX_FMT_RGB565:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_RGB565;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 16;
> + break;
> + case V4L2_PIX_FMT_ARGB444:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB444;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 16;
> + break;
> + case V4L2_PIX_FMT_ARGB555:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB555;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 16;
> + break;
> + case V4L2_PIX_FMT_ABGR32:
> + case V4L2_PIX_FMT_XBGR32:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB32;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED32;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 32;
> + break;
> + case V4L2_PIX_FMT_YUV420:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_YC420P;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PLANAR;
> + isc->try_config.bpp = 12;
> + break;
> + case V4L2_PIX_FMT_YUV422P:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_YC422P;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PLANAR;
> + isc->try_config.bpp = 16;
> + break;
> + case V4L2_PIX_FMT_YUYV:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED32;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 16;
> + break;
> + case V4L2_PIX_FMT_GREY:
> + isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DATY8;
> + isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
> + isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> + isc->try_config.bpp = 8;
> + break;
> + default:
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> +/*
> + * Configuring pipeline modules, depending on which format the ISC outputs
> + * and considering which format it has as input from the sensor.
> + */
> +static int isc_try_configure_pipeline(struct isc_device *isc)
> +{
> + switch (isc->try_config.fourcc) {
> + case V4L2_PIX_FMT_RGB565:
> + case V4L2_PIX_FMT_ARGB555:
> + case V4L2_PIX_FMT_ARGB444:
> + case V4L2_PIX_FMT_ABGR32:
> + case V4L2_PIX_FMT_XBGR32:
> + /* if sensor format is RAW, we convert inside ISC */
> + if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> + isc->try_config.bits_pipeline = CFA_ENABLE |
> + WB_ENABLE | GAM_ENABLES;
> + } else {
> + isc->try_config.bits_pipeline = 0x0;
> + }
> + break;
> + case V4L2_PIX_FMT_YUV420:
> + /* if sensor format is RAW, we convert inside ISC */
> + if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> + isc->try_config.bits_pipeline = CFA_ENABLE |
> + CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
> + SUB420_ENABLE | SUB422_ENABLE | CBC_ENABLE;
> + } else {
> + isc->try_config.bits_pipeline = 0x0;
> + }
> + break;
> + case V4L2_PIX_FMT_YUV422P:
> + /* if sensor format is RAW, we convert inside ISC */
> + if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> + isc->try_config.bits_pipeline = CFA_ENABLE |
> + CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
> + SUB422_ENABLE | CBC_ENABLE;
> + } else {
> + isc->try_config.bits_pipeline = 0x0;
> + }
> + break;
> + case V4L2_PIX_FMT_YUYV:
> + /* if sensor format is RAW, we convert inside ISC */
> + if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> + isc->try_config.bits_pipeline = CFA_ENABLE |
> + CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
> + SUB422_ENABLE | CBC_ENABLE;
> + } else {
> + isc->try_config.bits_pipeline = 0x0;
> + }
> + break;
> + case V4L2_PIX_FMT_GREY:
> + if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> + /* if sensor format is RAW, we convert inside ISC */
> + isc->try_config.bits_pipeline = CFA_ENABLE |
> + CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
> + CBC_ENABLE;
> + } else {
> + isc->try_config.bits_pipeline = 0x0;
> + }
> + break;
> + default:
> + isc->try_config.bits_pipeline = 0x0;
> + }
> + return 0;
> +}
> +
> +static int isc_try_fmt(struct isc_device *isc, struct v4l2_format *f,
> + u32 *code)
> +{
> + int i;
> + struct isc_format *sd_fmt = NULL, *direct_fmt = NULL;
> + struct v4l2_pix_format *pixfmt = &f->fmt.pix;
> + struct v4l2_subdev_pad_config pad_cfg;
> + struct v4l2_subdev_format format = {
> + .which = V4L2_SUBDEV_FORMAT_TRY,
> + };
> + u32 mbus_code;
> + int ret;
> + bool rlp_dma_direct_dump = false;
> +
> + if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + /* Step 1: find a RAW format that is supported */
> + for (i = 0; i < isc->num_user_formats; i++) {
> + if (ISC_IS_FORMAT_RAW(isc->user_formats[i]->mbus_code)) {
> + sd_fmt = isc->user_formats[i];
> + break;
> + }
> + }
> + /* Step 2: We can continue with this RAW format, or we can look
> + * for better: maybe sensor supports directly what we need.
> + */
> + direct_fmt = find_format_by_fourcc(isc, pixfmt->pixelformat);
> +
> + /* Step 3: We have both. We decide given the module parameter which
> + * one to use.
> + */
> + if (direct_fmt && sd_fmt && sensor_preferred)
> + sd_fmt = direct_fmt;
> +
> + /* Step 4: we do not have RAW but we have a direct format. Use it. */
> + if (direct_fmt && !sd_fmt)
> + sd_fmt = direct_fmt;
> +
> + /* Step 5: if we are using a direct format, we need to package
> + * everything as 8 bit data and just dump it
> + */
> + if (sd_fmt == direct_fmt)
> + rlp_dma_direct_dump = true;
> +
> + /* Step 6: We have no format. This can happen if the userspace
> + * requests some weird/invalid format.
> + * In this case, default to whatever we have
> + */
> + if (!sd_fmt && !direct_fmt) {
> + sd_fmt = isc->user_formats[isc->num_user_formats - 1];
> + v4l2_dbg(1, debug, &isc->v4l2_dev,
> + "Sensor not supporting %.4s, using %.4s\n",
> + (char *)&pixfmt->pixelformat, (char *)&sd_fmt->fourcc);
> + }
> +
> + if (!sd_fmt) {
> + ret = -EINVAL;
> + goto isc_try_fmt_err;
> + }
> +
> + /* Step 7: Print out what we decided for debugging */
> + v4l2_dbg(1, debug, &isc->v4l2_dev,
> + "Preferring to have sensor using format %.4s\n",
> + (char *)&sd_fmt->fourcc);
> +
> + /* Step 8: at this moment we decided which format the subdev will use */
> + isc->try_config.sd_format = sd_fmt;
> +
> + /* Limit to Atmel ISC hardware capabilities */
> + if (pixfmt->width > ISC_MAX_SUPPORT_WIDTH)
> + pixfmt->width = ISC_MAX_SUPPORT_WIDTH;
> + if (pixfmt->height > ISC_MAX_SUPPORT_HEIGHT)
> + pixfmt->height = ISC_MAX_SUPPORT_HEIGHT;
> +
> + /*
> + * The mbus format is the one the subdev outputs.
> + * The pixels will be transferred in this format Sensor -> ISC
> + */
> + mbus_code = sd_fmt->mbus_code;
> +
> + /*
> + * Validate formats. If the required format is not OK, default to raw.
> + */
> +
> + isc->try_config.fourcc = pixfmt->pixelformat;
> +
> + if (isc_try_validate_formats(isc)) {
> + pixfmt->pixelformat = isc->try_config.fourcc = sd_fmt->fourcc;
> + /* Re-try to validate the new format */
> + ret = isc_try_validate_formats(isc);
> + if (ret)
> + goto isc_try_fmt_err;
> + }
> +
> + ret = isc_try_configure_rlp_dma(isc, rlp_dma_direct_dump);
> + if (ret)
> + goto isc_try_fmt_err;
> +
> + ret = isc_try_configure_pipeline(isc);
> + if (ret)
> + goto isc_try_fmt_err;
> +
> + v4l2_fill_mbus_format(&format.format, pixfmt, mbus_code);
> + ret = v4l2_subdev_call(isc->current_subdev->sd, pad, set_fmt,
> + &pad_cfg, &format);
> + if (ret < 0)
> + goto isc_try_fmt_subdev_err;
> +
> + v4l2_fill_pix_format(pixfmt, &format.format);
> +
> + pixfmt->field = V4L2_FIELD_NONE;
> + pixfmt->bytesperline = (pixfmt->width * isc->try_config.bpp) >> 3;
> + pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
> +
> + if (code)
> + *code = mbus_code;
> +
> + return 0;
> +
> +isc_try_fmt_err:
> + v4l2_err(&isc->v4l2_dev, "Could not find any possible format for a working pipeline\n");
> +isc_try_fmt_subdev_err:
> + memset(&isc->try_config, 0, sizeof(isc->try_config));
> +
> + return ret;
> +}
> +
> +static int isc_set_fmt(struct isc_device *isc, struct v4l2_format *f)
> +{
> + struct v4l2_subdev_format format = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> + u32 mbus_code = 0;
> + int ret;
> +
> + ret = isc_try_fmt(isc, f, &mbus_code);
> + if (ret)
> + return ret;
> +
> + v4l2_fill_mbus_format(&format.format, &f->fmt.pix, mbus_code);
> + ret = v4l2_subdev_call(isc->current_subdev->sd, pad,
> + set_fmt, NULL, &format);
> + if (ret < 0)
> + return ret;
> +
> + isc->fmt = *f;
> +
> + if (isc->try_config.sd_format && isc->config.sd_format &&
> + isc->try_config.sd_format != isc->config.sd_format) {
> + isc->ctrls.hist_stat = HIST_INIT;
> + isc_reset_awb_ctrls(isc);
> + }
> + /* make the try configuration active */
> + isc->config = isc->try_config;
> +
> + v4l2_dbg(1, debug, &isc->v4l2_dev, "New ISC configuration in place\n");
> +
> + return 0;
> +}
> +
> +static int isc_s_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct isc_device *isc = video_drvdata(file);
> +
> + if (vb2_is_streaming(&isc->vb2_vidq))
> + return -EBUSY;
> +
> + return isc_set_fmt(isc, f);
> +}
> +
> +static int isc_try_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct isc_device *isc = video_drvdata(file);
> +
> + return isc_try_fmt(isc, f, NULL);
> +}
> +
> +static int isc_enum_input(struct file *file, void *priv,
> + struct v4l2_input *inp)
> +{
> + if (inp->index != 0)
> + return -EINVAL;
> +
> + inp->type = V4L2_INPUT_TYPE_CAMERA;
> + inp->std = 0;
> + strscpy(inp->name, "Camera", sizeof(inp->name));
> +
> + return 0;
> +}
> +
> +static int isc_g_input(struct file *file, void *priv, unsigned int *i)
> +{
> + *i = 0;
> +
> + return 0;
> +}
> +
> +static int isc_s_input(struct file *file, void *priv, unsigned int i)
> +{
> + if (i > 0)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int isc_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
> +{
> + struct isc_device *isc = video_drvdata(file);
> +
> + return v4l2_g_parm_cap(video_devdata(file), isc->current_subdev->sd, a);
> +}
> +
> +static int isc_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
> +{
> + struct isc_device *isc = video_drvdata(file);
> +
> + return v4l2_s_parm_cap(video_devdata(file), isc->current_subdev->sd, a);
> +}
> +
> +static int isc_enum_framesizes(struct file *file, void *fh,
> + struct v4l2_frmsizeenum *fsize)
> +{
> + struct isc_device *isc = video_drvdata(file);
> + struct v4l2_subdev_frame_size_enum fse = {
> + .index = fsize->index,
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> + int ret = -EINVAL;
> + int i;
> +
> + for (i = 0; i < isc->num_user_formats; i++)
> + if (isc->user_formats[i]->fourcc == fsize->pixel_format)
> + ret = 0;
> +
> + for (i = 0; i < ARRAY_SIZE(controller_formats); i++)
> + if (controller_formats[i].fourcc == fsize->pixel_format)
> + ret = 0;
> +
> + if (ret)
> + return ret;
> +
> + ret = v4l2_subdev_call(isc->current_subdev->sd, pad, enum_frame_size,
> + NULL, &fse);
> + if (ret)
> + return ret;
> +
> + fse.code = isc->config.sd_format->mbus_code;
> +
> + fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
> + fsize->discrete.width = fse.max_width;
> + fsize->discrete.height = fse.max_height;
> +
> + return 0;
> +}
> +
> +static int isc_enum_frameintervals(struct file *file, void *fh,
> + struct v4l2_frmivalenum *fival)
> +{
> + struct isc_device *isc = video_drvdata(file);
> + struct v4l2_subdev_frame_interval_enum fie = {
> + .index = fival->index,
> + .width = fival->width,
> + .height = fival->height,
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> + int ret = -EINVAL;
> + int i;

unsigned int

> +
> + for (i = 0; i < isc->num_user_formats; i++)
> + if (isc->user_formats[i]->fourcc == fival->pixel_format)
> + ret = 0;
> +
> + for (i = 0; i < ARRAY_SIZE(controller_formats); i++)
> + if (controller_formats[i].fourcc == fival->pixel_format)
> + ret = 0;
> +
> + if (ret)
> + return ret;
> +
> + ret = v4l2_subdev_call(isc->current_subdev->sd, pad,
> + enum_frame_interval, NULL, &fie);
> + if (ret)
> + return ret;
> +
> + fie.code = isc->config.sd_format->mbus_code;
> + fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
> + fival->discrete = fie.interval;
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops isc_ioctl_ops = {
> + .vidioc_querycap = isc_querycap,
> + .vidioc_enum_fmt_vid_cap = isc_enum_fmt_vid_cap,
> + .vidioc_g_fmt_vid_cap = isc_g_fmt_vid_cap,
> + .vidioc_s_fmt_vid_cap = isc_s_fmt_vid_cap,
> + .vidioc_try_fmt_vid_cap = isc_try_fmt_vid_cap,
> +
> + .vidioc_enum_input = isc_enum_input,
> + .vidioc_g_input = isc_g_input,
> + .vidioc_s_input = isc_s_input,
> +
> + .vidioc_reqbufs = vb2_ioctl_reqbufs,
> + .vidioc_querybuf = vb2_ioctl_querybuf,
> + .vidioc_qbuf = vb2_ioctl_qbuf,
> + .vidioc_expbuf = vb2_ioctl_expbuf,
> + .vidioc_dqbuf = vb2_ioctl_dqbuf,
> + .vidioc_create_bufs = vb2_ioctl_create_bufs,
> + .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> + .vidioc_streamon = vb2_ioctl_streamon,
> + .vidioc_streamoff = vb2_ioctl_streamoff,
> +
> + .vidioc_g_parm = isc_g_parm,
> + .vidioc_s_parm = isc_s_parm,
> + .vidioc_enum_framesizes = isc_enum_framesizes,
> + .vidioc_enum_frameintervals = isc_enum_frameintervals,
> +
> + .vidioc_log_status = v4l2_ctrl_log_status,
> + .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +};
> +
> +static int isc_open(struct file *file)
> +{
> + struct isc_device *isc = video_drvdata(file);
> + struct v4l2_subdev *sd = isc->current_subdev->sd;
> + int ret;
> +
> + if (mutex_lock_interruptible(&isc->lock))
> + return -ERESTARTSYS;
> +
> + ret = v4l2_fh_open(file);
> + if (ret < 0)
> + goto unlock;
> +
> + if (!v4l2_fh_is_singular_file(file))
> + goto unlock;
> +
> + ret = v4l2_subdev_call(sd, core, s_power, 1);
> + if (ret < 0 && ret != -ENOIOCTLCMD) {
> + v4l2_fh_release(file);
> + goto unlock;
> + }
> +
> + ret = isc_set_fmt(isc, &isc->fmt);
> + if (ret) {
> + v4l2_subdev_call(sd, core, s_power, 0);
> + v4l2_fh_release(file);
> + }
> +
> +unlock:
> + mutex_unlock(&isc->lock);
> + return ret;
> +}
> +
> +static int isc_release(struct file *file)
> +{
> + struct isc_device *isc = video_drvdata(file);
> + struct v4l2_subdev *sd = isc->current_subdev->sd;
> + bool fh_singular;
> + int ret;
> +
> + mutex_lock(&isc->lock);
> +
> + fh_singular = v4l2_fh_is_singular_file(file);
> +
> + ret = _vb2_fop_release(file, NULL);
> +
> + if (fh_singular)
> + v4l2_subdev_call(sd, core, s_power, 0);
> +
> + mutex_unlock(&isc->lock);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_file_operations isc_fops = {
> + .owner = THIS_MODULE,
> + .open = isc_open,
> + .release = isc_release,
> + .unlocked_ioctl = video_ioctl2,
> + .read = vb2_fop_read,
> + .mmap = vb2_fop_mmap,
> + .poll = vb2_fop_poll,
> +};
> +
> +irqreturn_t isc_interrupt(int irq, void *dev_id)
> +{
> + struct isc_device *isc = (struct isc_device *)dev_id;
> + struct regmap *regmap = isc->regmap;
> + u32 isc_intsr, isc_intmask, pending;
> + irqreturn_t ret = IRQ_NONE;
> +
> + regmap_read(regmap, ISC_INTSR, &isc_intsr);
> + regmap_read(regmap, ISC_INTMASK, &isc_intmask);
> +
> + pending = isc_intsr & isc_intmask;
> +
> + if (likely(pending & ISC_INT_DDONE)) {
> + spin_lock(&isc->dma_queue_lock);
> + if (isc->cur_frm) {
> + struct vb2_v4l2_buffer *vbuf = &isc->cur_frm->vb;
> + struct vb2_buffer *vb = &vbuf->vb2_buf;
> +
> + vb->timestamp = ktime_get_ns();
> + vbuf->sequence = isc->sequence++;
> + vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> + isc->cur_frm = NULL;
> + }
> +
> + if (!list_empty(&isc->dma_queue) && !isc->stop) {
> + isc->cur_frm = list_first_entry(&isc->dma_queue,
> + struct isc_buffer, list);
> + list_del(&isc->cur_frm->list);
> +
> + isc_start_dma(isc);
> + }
> +
> + if (isc->stop)
> + complete(&isc->comp);
> +
> + ret = IRQ_HANDLED;
> + spin_unlock(&isc->dma_queue_lock);
> + }
> +
> + if (pending & ISC_INT_HISDONE) {
> + schedule_work(&isc->awb_work);
> + ret = IRQ_HANDLED;
> + }
> +
> + return ret;
> +}
> +
> +static void isc_hist_count(struct isc_device *isc, u32 *min, u32 *max)
> +{
> + struct regmap *regmap = isc->regmap;
> + struct isc_ctrls *ctrls = &isc->ctrls;
> + u32 *hist_count = &ctrls->hist_count[ctrls->hist_id];
> + u32 *hist_entry = &ctrls->hist_entry[0];
> + u32 i;
> +
> + *min = 0;
> + *max = HIST_ENTRIES;
> +
> + regmap_bulk_read(regmap, ISC_HIS_ENTRY, hist_entry, HIST_ENTRIES);
> +
> + *hist_count = 0;
> + /*
> + * we deliberately ignore the end of the histogram,
> + * the most white pixels
> + */
> + for (i = 1; i < HIST_ENTRIES; i++) {
> + if (*hist_entry && !*min)
> + *min = i;
> + if (*hist_entry)
> + *max = i;
> + *hist_count += i * (*hist_entry++);
> + }
> +
> + if (!*min)
> + *min = 1;
> +}
> +
> +static void isc_wb_update(struct isc_ctrls *ctrls)
> +{
> + u32 *hist_count = &ctrls->hist_count[0];
> + u32 c, offset[4];
> + u64 avg = 0;
> + /* We compute two gains, stretch gain and grey world gain */
> + u32 s_gain[4], gw_gain[4];
> +
> + /*
> + * According to Grey World, we need to set gains for R/B to normalize
> + * them towards the green channel.
> + * Thus we want to keep Green as fixed and adjust only Red/Blue
> + * Compute the average of the both green channels first
> + */
> + avg = (u64)hist_count[ISC_HIS_CFG_MODE_GR] +
> + (u64)hist_count[ISC_HIS_CFG_MODE_GB];
> + avg >>= 1;
> +
> + /* Green histogram is null, nothing to do */
> + if (!avg)
> + return;
> +
> + for (c = ISC_HIS_CFG_MODE_GR; c <= ISC_HIS_CFG_MODE_B; c++) {
> + /*
> + * the color offset is the minimum value of the histogram.
> + * we stretch this color to the full range by substracting
> + * this value from the color component.
> + */
> + offset[c] = ctrls->hist_minmax[c][HIST_MIN_INDEX];
> + /*
> + * The offset is always at least 1. If the offset is 1, we do
> + * not need to adjust it, so our result must be zero.
> + * the offset is computed in a histogram on 9 bits (0..512)
> + * but the offset in register is based on
> + * 12 bits pipeline (0..4096).
> + * we need to shift with the 3 bits that the histogram is
> + * ignoring
> + */
> + ctrls->offset[c] = (offset[c] - 1) << 3;
> +
> + /* the offset is then taken and converted to 2's complements */
> + if (!ctrls->offset[c])
> + ctrls->offset[c] = ISC_WB_O_ZERO_VAL;
> +
> + /*
> + * the stretch gain is the total number of histogram bins
> + * divided by the actual range of color component (Max - Min)
> + * If we compute gain like this, the actual color component
> + * will be stretched to the full histogram.
> + * We need to shift 9 bits for precision, we have 9 bits for
> + * decimals
> + */
> + s_gain[c] = (HIST_ENTRIES << 9) /
> + (ctrls->hist_minmax[c][HIST_MAX_INDEX] -
> + ctrls->hist_minmax[c][HIST_MIN_INDEX] + 1);
> +
> + /*
> + * Now we have to compute the gain w.r.t. the average.
> + * Add/lose gain to the component towards the average.
> + * If it happens that the component is zero, use the
> + * fixed point value : 1.0 gain.
> + */
> + if (hist_count[c])
> + gw_gain[c] = div_u64(avg << 9, hist_count[c]);
> + else
> + gw_gain[c] = 1 << 9;
> +
> + /* multiply both gains and adjust for decimals */
> + ctrls->gain[c] = s_gain[c] * gw_gain[c];
> + ctrls->gain[c] >>= 9;
> + }
> +}
> +
> +static void isc_awb_work(struct work_struct *w)
> +{
> + struct isc_device *isc =
> + container_of(w, struct isc_device, awb_work);
> + struct regmap *regmap = isc->regmap;
> + struct isc_ctrls *ctrls = &isc->ctrls;
> + u32 hist_id = ctrls->hist_id;
> + u32 baysel;
> + unsigned long flags;
> + u32 min, max;
> +
> + /* streaming is not active anymore */
> + if (isc->stop)
> + return;
> +
> + if (ctrls->hist_stat != HIST_ENABLED)
> + return;
> +
> + isc_hist_count(isc, &min, &max);
> + ctrls->hist_minmax[hist_id][HIST_MIN_INDEX] = min;
> + ctrls->hist_minmax[hist_id][HIST_MAX_INDEX] = max;
> +
> + if (hist_id != ISC_HIS_CFG_MODE_B) {
> + hist_id++;
> + } else {
> + isc_wb_update(ctrls);
> + hist_id = ISC_HIS_CFG_MODE_GR;
> + }
> +
> + ctrls->hist_id = hist_id;
> + baysel = isc->config.sd_format->cfa_baycfg << ISC_HIS_CFG_BAYSEL_SHIFT;
> +
> + /* if no more auto white balance, reset controls. */
> + if (ctrls->awb == ISC_WB_NONE)
> + isc_reset_awb_ctrls(isc);
> +
> + pm_runtime_get_sync(isc->dev);
> +
> + /*
> + * only update if we have all the required histograms and controls
> + * if awb has been disabled, we need to reset registers as well.
> + */
> + if (hist_id == ISC_HIS_CFG_MODE_GR || ctrls->awb == ISC_WB_NONE) {
> + /*
> + * It may happen that DMA Done IRQ will trigger while we are
> + * updating white balance registers here.
> + * In that case, only parts of the controls have been updated.
> + * We can avoid that by locking the section.
> + */
> + spin_lock_irqsave(&isc->awb_lock, flags);
> + isc_update_awb_ctrls(isc);
> + spin_unlock_irqrestore(&isc->awb_lock, flags);
> +
> + /*
> + * if we are doing just the one time white balance adjustment,
> + * we are basically done.
> + */
> + if (ctrls->awb == ISC_WB_ONETIME) {
> + v4l2_info(&isc->v4l2_dev,
> + "Completed one time white-balance adjustment.\n");
> + ctrls->awb = ISC_WB_NONE;
> + }
> + }
> + regmap_write(regmap, ISC_HIS_CFG, hist_id | baysel | ISC_HIS_CFG_RAR);
> + isc_update_profile(isc);
> + /* if awb has been disabled, we don't need to start another histogram */
> + if (ctrls->awb)
> + regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_HISREQ);
> +
> + pm_runtime_put_sync(isc->dev);
> +}
> +
> +static int isc_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct isc_device *isc = container_of(ctrl->handler,
> + struct isc_device, ctrls.handler);
> + struct isc_ctrls *ctrls = &isc->ctrls;
> +
> + if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
> + return 0;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_BRIGHTNESS:
> + ctrls->brightness = ctrl->val & ISC_CBC_BRIGHT_MASK;
> + break;
> + case V4L2_CID_CONTRAST:
> + ctrls->contrast = ctrl->val & ISC_CBC_CONTRAST_MASK;
> + break;
> + case V4L2_CID_GAMMA:
> + ctrls->gamma_index = ctrl->val;
> + break;
> + case V4L2_CID_AUTO_WHITE_BALANCE:
> + if (ctrl->val == 1)
> + ctrls->awb = ISC_WB_AUTO;
> + else
> + ctrls->awb = ISC_WB_NONE;
> +
> + /* we did not configure ISC yet */
> + if (!isc->config.sd_format)
> + break;
> +
> + if (ctrls->hist_stat != HIST_ENABLED)
> + isc_reset_awb_ctrls(isc);
> +
> + if (isc->ctrls.awb == ISC_WB_AUTO &&
> + vb2_is_streaming(&isc->vb2_vidq) &&
> + ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
> + isc_set_histogram(isc, true);
> +
> + break;
> + case V4L2_CID_DO_WHITE_BALANCE:
> + /* if AWB is enabled, do nothing */
> + if (ctrls->awb == ISC_WB_AUTO)
> + return 0;
> +
> + ctrls->awb = ISC_WB_ONETIME;
> + isc_set_histogram(isc, true);
> + v4l2_dbg(1, debug, &isc->v4l2_dev,
> + "One time white-balance started.\n");
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ctrl_ops isc_ctrl_ops = {
> + .s_ctrl = isc_s_ctrl,
> +};
> +
> +static int isc_ctrl_init(struct isc_device *isc)
> +{
> + const struct v4l2_ctrl_ops *ops = &isc_ctrl_ops;
> + struct isc_ctrls *ctrls = &isc->ctrls;
> + struct v4l2_ctrl_handler *hdl = &ctrls->handler;
> + int ret;
> +
> + ctrls->hist_stat = HIST_INIT;
> + isc_reset_awb_ctrls(isc);
> +
> + ret = v4l2_ctrl_handler_init(hdl, 5);
> + if (ret < 0)
> + return ret;
> +
> + ctrls->brightness = 0;
> + ctrls->contrast = 256;
> +
> + v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BRIGHTNESS, -1024, 1023, 1, 0);
> + v4l2_ctrl_new_std(hdl, ops, V4L2_CID_CONTRAST, -2048, 2047, 1, 256);
> + v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAMMA, 0, GAMMA_MAX, 1, 2);
> + v4l2_ctrl_new_std(hdl, ops, V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
> +
> + /* do_white_balance is a button, so min,max,step,default are ignored */
> + isc->do_wb_ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_DO_WHITE_BALANCE,
> + 0, 0, 0, 0);

This can fail. You'll need to handle the error, including freeing the
initialised control handler.

> +
> + v4l2_ctrl_activate(isc->do_wb_ctrl, false);
> +
> + v4l2_ctrl_handler_setup(hdl);
> +
> + return 0;
> +}
> +
> +static int isc_async_bound(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_subdev *asd)
> +{
> + struct isc_device *isc = container_of(notifier->v4l2_dev,
> + struct isc_device, v4l2_dev);
> + struct isc_subdev_entity *subdev_entity =
> + container_of(notifier, struct isc_subdev_entity, notifier);
> +
> + if (video_is_registered(&isc->video_dev)) {
> + v4l2_err(&isc->v4l2_dev, "only supports one sub-device.\n");
> + return -EBUSY;
> + }
> +
> + subdev_entity->sd = subdev;
> +
> + return 0;
> +}
> +
> +static void isc_async_unbind(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_subdev *asd)
> +{
> + struct isc_device *isc = container_of(notifier->v4l2_dev,
> + struct isc_device, v4l2_dev);
> + cancel_work_sync(&isc->awb_work);
> + video_unregister_device(&isc->video_dev);
> + v4l2_ctrl_handler_free(&isc->ctrls.handler);
> +}
> +
> +static struct isc_format *find_format_by_code(unsigned int code, int *index)
> +{
> + struct isc_format *fmt = &formats_list[0];
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(formats_list); i++) {
> + if (fmt->mbus_code == code) {
> + *index = i;
> + return fmt;
> + }
> +
> + fmt++;
> + }
> +
> + return NULL;
> +}
> +
> +static int isc_formats_init(struct isc_device *isc)
> +{
> + struct isc_format *fmt;
> + struct v4l2_subdev *subdev = isc->current_subdev->sd;
> + unsigned int num_fmts, i, j;
> + u32 list_size = ARRAY_SIZE(formats_list);
> + struct v4l2_subdev_mbus_code_enum mbus_code = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> +
> + num_fmts = 0;
> + while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
> + NULL, &mbus_code)) {
> + mbus_code.index++;
> +
> + fmt = find_format_by_code(mbus_code.code, &i);
> + if (!fmt) {
> + v4l2_warn(&isc->v4l2_dev, "Mbus code %x not supported\n",
> + mbus_code.code);
> + continue;
> + }
> +
> + fmt->sd_support = true;
> + num_fmts++;
> + }
> +
> + if (!num_fmts)
> + return -ENXIO;
> +
> + isc->num_user_formats = num_fmts;
> + isc->user_formats = devm_kcalloc(isc->dev,
> + num_fmts, sizeof(*isc->user_formats),
> + GFP_KERNEL);
> + if (!isc->user_formats)
> + return -ENOMEM;
> +
> + fmt = &formats_list[0];
> + for (i = 0, j = 0; i < list_size; i++) {
> + if (fmt->sd_support)
> + isc->user_formats[j++] = fmt;
> + fmt++;
> + }
> +
> + return 0;
> +}
> +
> +static int isc_set_default_fmt(struct isc_device *isc)
> +{
> + struct v4l2_format f = {
> + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
> + .fmt.pix = {
> + .width = VGA_WIDTH,
> + .height = VGA_HEIGHT,
> + .field = V4L2_FIELD_NONE,
> + .pixelformat = isc->user_formats[0]->fourcc,
> + },
> + };
> + int ret;
> +
> + ret = isc_try_fmt(isc, &f, NULL);
> + if (ret)
> + return ret;
> +
> + isc->fmt = f;
> + return 0;
> +}
> +
> +static int isc_async_complete(struct v4l2_async_notifier *notifier)
> +{
> + struct isc_device *isc = container_of(notifier->v4l2_dev,
> + struct isc_device, v4l2_dev);
> + struct video_device *vdev = &isc->video_dev;
> + struct vb2_queue *q = &isc->vb2_vidq;
> + int ret;
> +
> + INIT_WORK(&isc->awb_work, isc_awb_work);
> +
> + ret = v4l2_device_register_subdev_nodes(&isc->v4l2_dev);
> + if (ret < 0) {
> + v4l2_err(&isc->v4l2_dev, "Failed to register subdev nodes\n");
> + return ret;
> + }
> +
> + isc->current_subdev = container_of(notifier,
> + struct isc_subdev_entity, notifier);
> + mutex_init(&isc->lock);
> + init_completion(&isc->comp);
> +
> + /* Initialize videobuf2 queue */
> + q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
> + q->drv_priv = isc;
> + q->buf_struct_size = sizeof(struct isc_buffer);
> + q->ops = &isc_vb2_ops;
> + q->mem_ops = &vb2_dma_contig_memops;
> + q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> + q->lock = &isc->lock;
> + q->min_buffers_needed = 1;
> + q->dev = isc->dev;
> +
> + ret = vb2_queue_init(q);
> + if (ret < 0) {
> + v4l2_err(&isc->v4l2_dev,
> + "vb2_queue_init() failed: %d\n", ret);

mutex_destroy(&isc->lock);

I'd add a label to do that at the end. Or move the mutex_init() just before
registering the video device, unless something needs the mutex before that.

> + return ret;
> + }
> +
> + /* Init video dma queues */
> + INIT_LIST_HEAD(&isc->dma_queue);
> + spin_lock_init(&isc->dma_queue_lock);
> + spin_lock_init(&isc->awb_lock);
> +
> + ret = isc_formats_init(isc);
> + if (ret < 0) {
> + v4l2_err(&isc->v4l2_dev,
> + "Init format failed: %d\n", ret);
> + return ret;
> + }
> +
> + ret = isc_set_default_fmt(isc);
> + if (ret) {
> + v4l2_err(&isc->v4l2_dev, "Could not set default format\n");
> + return ret;
> + }
> +
> + ret = isc_ctrl_init(isc);
> + if (ret) {
> + v4l2_err(&isc->v4l2_dev, "Init isc ctrols failed: %d\n", ret);
> + return ret;
> + }
> +
> + /* Register video device */
> + strscpy(vdev->name, ATMEL_ISC_NAME, sizeof(vdev->name));
> + vdev->release = video_device_release_empty;
> + vdev->fops = &isc_fops;
> + vdev->ioctl_ops = &isc_ioctl_ops;
> + vdev->v4l2_dev = &isc->v4l2_dev;
> + vdev->vfl_dir = VFL_DIR_RX;
> + vdev->queue = q;
> + vdev->lock = &isc->lock;
> + vdev->ctrl_handler = &isc->ctrls.handler;
> + vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
> + video_set_drvdata(vdev, isc);
> +
> + ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
> + if (ret < 0) {
> + v4l2_err(&isc->v4l2_dev,
> + "video_register_device failed: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +const struct v4l2_async_notifier_operations isc_async_ops = {
> + .bound = isc_async_bound,
> + .unbind = isc_async_unbind,
> + .complete = isc_async_complete,
> +};
> +
> +void isc_subdev_cleanup(struct isc_device *isc)
> +{
> + struct isc_subdev_entity *subdev_entity;
> +
> + list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
> + v4l2_async_notifier_unregister(&subdev_entity->notifier);
> + v4l2_async_notifier_cleanup(&subdev_entity->notifier);
> + }
> +
> + INIT_LIST_HEAD(&isc->subdev_entities);
> +}
> +
> +int isc_pipeline_init(struct isc_device *isc)
> +{
> + struct device *dev = isc->dev;
> + struct regmap *regmap = isc->regmap;
> + struct regmap_field *regs;
> + unsigned int i;
> +
> + /* WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB422-->SUB420 */
> + const struct reg_field regfields[ISC_PIPE_LINE_NODE_NUM] = {
> + REG_FIELD(ISC_WB_CTRL, 0, 0),
> + REG_FIELD(ISC_CFA_CTRL, 0, 0),
> + REG_FIELD(ISC_CC_CTRL, 0, 0),
> + REG_FIELD(ISC_GAM_CTRL, 0, 0),
> + REG_FIELD(ISC_GAM_CTRL, 1, 1),
> + REG_FIELD(ISC_GAM_CTRL, 2, 2),
> + REG_FIELD(ISC_GAM_CTRL, 3, 3),
> + REG_FIELD(ISC_CSC_CTRL, 0, 0),
> + REG_FIELD(ISC_CBC_CTRL, 0, 0),
> + REG_FIELD(ISC_SUB422_CTRL, 0, 0),
> + REG_FIELD(ISC_SUB420_CTRL, 0, 0),
> + };
> +
> + for (i = 0; i < ISC_PIPE_LINE_NODE_NUM; i++) {
> + regs = devm_regmap_field_alloc(dev, regmap, regfields[i]);
> + if (IS_ERR(regs))
> + return PTR_ERR(regs);
> +
> + isc->pipeline[i] = regs;
> + }
> +
> + return 0;
> +}
> +
> +/* regmap configuration */
> +#define ATMEL_ISC_REG_MAX 0xbfc
> +const struct regmap_config isc_regmap_config = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> + .max_register = ATMEL_ISC_REG_MAX,
> +};
> +
> diff --git a/drivers/media/platform/atmel/atmel-isc.c b/drivers/media/platform/atmel/atmel-isc.c
> deleted file mode 100644
> index da3b441..0000000
> --- a/drivers/media/platform/atmel/atmel-isc.c
> +++ /dev/null
> @@ -1,2634 +0,0 @@
> -/*
> - * Atmel Image Sensor Controller (ISC) driver
> - *
> - * Copyright (C) 2016 Atmel
> - *
> - * Author: Songjun Wu <songjun.wu@microchip.com>
> - *
> - * This program is free software; you may redistribute it and/or modify
> - * it under the terms of the GNU General Public License as published by
> - * the Free Software Foundation; version 2 of the License.
> - *
> - * Sensor-->PFE-->WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB-->RLP-->DMA
> - *
> - * ISC video pipeline integrates the following submodules:
> - * PFE: Parallel Front End to sample the camera sensor input stream
> - * WB: Programmable white balance in the Bayer domain
> - * CFA: Color filter array interpolation module
> - * CC: Programmable color correction
> - * GAM: Gamma correction
> - * CSC: Programmable color space conversion
> - * CBC: Contrast and Brightness control
> - * SUB: This module performs YCbCr444 to YCbCr420 chrominance subsampling
> - * RLP: This module performs rounding, range limiting
> - * and packing of the incoming data
> - */
> -
> -#include <linux/clk.h>
> -#include <linux/clkdev.h>
> -#include <linux/clk-provider.h>
> -#include <linux/delay.h>
> -#include <linux/interrupt.h>
> -#include <linux/math64.h>
> -#include <linux/module.h>
> -#include <linux/of.h>
> -#include <linux/of_graph.h>
> -#include <linux/platform_device.h>
> -#include <linux/pm_runtime.h>
> -#include <linux/regmap.h>
> -#include <linux/videodev2.h>
> -
> -#include <media/v4l2-ctrls.h>
> -#include <media/v4l2-device.h>
> -#include <media/v4l2-event.h>
> -#include <media/v4l2-image-sizes.h>
> -#include <media/v4l2-ioctl.h>
> -#include <media/v4l2-fwnode.h>
> -#include <media/v4l2-subdev.h>
> -#include <media/videobuf2-dma-contig.h>
> -
> -#include "atmel-isc-regs.h"
> -
> -#define ATMEL_ISC_NAME "atmel_isc"
> -
> -#define ISC_MAX_SUPPORT_WIDTH 2592
> -#define ISC_MAX_SUPPORT_HEIGHT 1944
> -
> -#define ISC_CLK_MAX_DIV 255
> -
> -enum isc_clk_id {
> - ISC_ISPCK = 0,
> - ISC_MCK = 1,
> -};
> -
> -struct isc_clk {
> - struct clk_hw hw;
> - struct clk *clk;
> - struct regmap *regmap;
> - spinlock_t lock;
> - u8 id;
> - u8 parent_id;
> - u32 div;
> - struct device *dev;
> -};
> -
> -#define to_isc_clk(hw) container_of(hw, struct isc_clk, hw)
> -
> -struct isc_buffer {
> - struct vb2_v4l2_buffer vb;
> - struct list_head list;
> -};
> -
> -struct isc_subdev_entity {
> - struct v4l2_subdev *sd;
> - struct v4l2_async_subdev *asd;
> - struct v4l2_async_notifier notifier;
> -
> - u32 pfe_cfg0;
> -
> - struct list_head list;
> -};
> -
> -/*
> - * struct isc_format - ISC media bus format information
> - This structure represents the interface between the ISC
> - and the sensor. It's the input format received by
> - the ISC.
> - * @fourcc: Fourcc code for this format
> - * @mbus_code: V4L2 media bus format code.
> - * @cfa_baycfg: If this format is RAW BAYER, indicate the type of bayer.
> - this is either BGBG, RGRG, etc.
> - * @pfe_cfg0_bps: Number of hardware data lines connected to the ISC
> - */
> -
> -struct isc_format {
> - u32 fourcc;
> - u32 mbus_code;
> - u32 cfa_baycfg;
> -
> - bool sd_support;
> - u32 pfe_cfg0_bps;
> -};
> -
> -/* Pipeline bitmap */
> -#define WB_ENABLE BIT(0)
> -#define CFA_ENABLE BIT(1)
> -#define CC_ENABLE BIT(2)
> -#define GAM_ENABLE BIT(3)
> -#define GAM_BENABLE BIT(4)
> -#define GAM_GENABLE BIT(5)
> -#define GAM_RENABLE BIT(6)
> -#define CSC_ENABLE BIT(7)
> -#define CBC_ENABLE BIT(8)
> -#define SUB422_ENABLE BIT(9)
> -#define SUB420_ENABLE BIT(10)
> -
> -#define GAM_ENABLES (GAM_RENABLE | GAM_GENABLE | GAM_BENABLE | GAM_ENABLE)
> -
> -/*
> - * struct fmt_config - ISC format configuration and internal pipeline
> - This structure represents the internal configuration
> - of the ISC.
> - It also holds the format that ISC will present to v4l2.
> - * @sd_format: Pointer to an isc_format struct that holds the sensor
> - configuration.
> - * @fourcc: Fourcc code for this format.
> - * @bpp: Bytes per pixel in the current format.
> - * @rlp_cfg_mode: Configuration of the RLP (rounding, limiting packaging)
> - * @dcfg_imode: Configuration of the input of the DMA module
> - * @dctrl_dview: Configuration of the output of the DMA module
> - * @bits_pipeline: Configuration of the pipeline, which modules are enabled
> - */
> -struct fmt_config {
> - struct isc_format *sd_format;
> -
> - u32 fourcc;
> - u8 bpp;
> -
> - u32 rlp_cfg_mode;
> - u32 dcfg_imode;
> - u32 dctrl_dview;
> -
> - u32 bits_pipeline;
> -};
> -
> -#define HIST_ENTRIES 512
> -#define HIST_BAYER (ISC_HIS_CFG_MODE_B + 1)
> -
> -enum{
> - HIST_INIT = 0,
> - HIST_ENABLED,
> - HIST_DISABLED,
> -};
> -
> -struct isc_ctrls {
> - struct v4l2_ctrl_handler handler;
> -
> - u32 brightness;
> - u32 contrast;
> - u8 gamma_index;
> -#define ISC_WB_NONE 0
> -#define ISC_WB_AUTO 1
> -#define ISC_WB_ONETIME 2
> - u8 awb;
> -
> - /* one for each component : GR, R, GB, B */
> - u32 gain[HIST_BAYER];
> - u32 offset[HIST_BAYER];
> -
> - u32 hist_entry[HIST_ENTRIES];
> - u32 hist_count[HIST_BAYER];
> - u8 hist_id;
> - u8 hist_stat;
> -#define HIST_MIN_INDEX 0
> -#define HIST_MAX_INDEX 1
> - u32 hist_minmax[HIST_BAYER][2];
> -};
> -
> -#define ISC_PIPE_LINE_NODE_NUM 11
> -
> -struct isc_device {
> - struct regmap *regmap;
> - struct clk *hclock;
> - struct clk *ispck;
> - struct isc_clk isc_clks[2];
> -
> - struct device *dev;
> - struct v4l2_device v4l2_dev;
> - struct video_device video_dev;
> -
> - struct vb2_queue vb2_vidq;
> - spinlock_t dma_queue_lock;
> - struct list_head dma_queue;
> - struct isc_buffer *cur_frm;
> - unsigned int sequence;
> - bool stop;
> - struct completion comp;
> -
> - struct v4l2_format fmt;
> - struct isc_format **user_formats;
> - unsigned int num_user_formats;
> -
> - struct fmt_config config;
> - struct fmt_config try_config;
> -
> - struct isc_ctrls ctrls;
> - struct v4l2_ctrl *do_wb_ctrl;
> - struct work_struct awb_work;
> -
> - struct mutex lock;
> - spinlock_t awb_lock;
> -
> - struct regmap_field *pipeline[ISC_PIPE_LINE_NODE_NUM];
> -
> - struct isc_subdev_entity *current_subdev;
> - struct list_head subdev_entities;
> -};
> -
> -/* This is a list of the formats that the ISC can *output* */
> -static struct isc_format controller_formats[] = {
> - {
> - .fourcc = V4L2_PIX_FMT_ARGB444,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_ARGB555,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_RGB565,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_ABGR32,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_XBGR32,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_YUV420,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_YUYV,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_YUV422P,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_GREY,
> - },
> -};
> -
> -/* This is a list of formats that the ISC can receive as *input* */
> -static struct isc_format formats_list[] = {
> - {
> - .fourcc = V4L2_PIX_FMT_SBGGR8,
> - .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
> - .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> - .cfa_baycfg = ISC_BAY_CFG_BGBG,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SGBRG8,
> - .mbus_code = MEDIA_BUS_FMT_SGBRG8_1X8,
> - .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> - .cfa_baycfg = ISC_BAY_CFG_GBGB,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SGRBG8,
> - .mbus_code = MEDIA_BUS_FMT_SGRBG8_1X8,
> - .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> - .cfa_baycfg = ISC_BAY_CFG_GRGR,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SRGGB8,
> - .mbus_code = MEDIA_BUS_FMT_SRGGB8_1X8,
> - .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> - .cfa_baycfg = ISC_BAY_CFG_RGRG,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SBGGR10,
> - .mbus_code = MEDIA_BUS_FMT_SBGGR10_1X10,
> - .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TEN,
> - .cfa_baycfg = ISC_BAY_CFG_RGRG,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SGBRG10,
> - .mbus_code = MEDIA_BUS_FMT_SGBRG10_1X10,
> - .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TEN,
> - .cfa_baycfg = ISC_BAY_CFG_GBGB,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SGRBG10,
> - .mbus_code = MEDIA_BUS_FMT_SGRBG10_1X10,
> - .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TEN,
> - .cfa_baycfg = ISC_BAY_CFG_GRGR,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SRGGB10,
> - .mbus_code = MEDIA_BUS_FMT_SRGGB10_1X10,
> - .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TEN,
> - .cfa_baycfg = ISC_BAY_CFG_RGRG,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SBGGR12,
> - .mbus_code = MEDIA_BUS_FMT_SBGGR12_1X12,
> - .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TWELVE,
> - .cfa_baycfg = ISC_BAY_CFG_BGBG,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SGBRG12,
> - .mbus_code = MEDIA_BUS_FMT_SGBRG12_1X12,
> - .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TWELVE,
> - .cfa_baycfg = ISC_BAY_CFG_GBGB,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SGRBG12,
> - .mbus_code = MEDIA_BUS_FMT_SGRBG12_1X12,
> - .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TWELVE,
> - .cfa_baycfg = ISC_BAY_CFG_GRGR,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_SRGGB12,
> - .mbus_code = MEDIA_BUS_FMT_SRGGB12_1X12,
> - .pfe_cfg0_bps = ISC_PFG_CFG0_BPS_TWELVE,
> - .cfa_baycfg = ISC_BAY_CFG_RGRG,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_GREY,
> - .mbus_code = MEDIA_BUS_FMT_Y8_1X8,
> - .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_YUYV,
> - .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
> - .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> - },
> - {
> - .fourcc = V4L2_PIX_FMT_RGB565,
> - .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
> - .pfe_cfg0_bps = ISC_PFE_CFG0_BPS_EIGHT,
> - },
> -};
> -
> -#define GAMMA_MAX 2
> -#define GAMMA_ENTRIES 64
> -
> -/* Gamma table with gamma 1/2.2 */
> -static const u32 isc_gamma_table[GAMMA_MAX + 1][GAMMA_ENTRIES] = {
> - /* 0 --> gamma 1/1.8 */
> - { 0x65, 0x66002F, 0x950025, 0xBB0020, 0xDB001D, 0xF8001A,
> - 0x1130018, 0x12B0017, 0x1420016, 0x1580014, 0x16D0013, 0x1810012,
> - 0x1940012, 0x1A60012, 0x1B80011, 0x1C90010, 0x1DA0010, 0x1EA000F,
> - 0x1FA000F, 0x209000F, 0x218000F, 0x227000E, 0x235000E, 0x243000E,
> - 0x251000E, 0x25F000D, 0x26C000D, 0x279000D, 0x286000D, 0x293000C,
> - 0x2A0000C, 0x2AC000C, 0x2B8000C, 0x2C4000C, 0x2D0000B, 0x2DC000B,
> - 0x2E7000B, 0x2F3000B, 0x2FE000B, 0x309000B, 0x314000B, 0x31F000A,
> - 0x32A000A, 0x334000B, 0x33F000A, 0x349000A, 0x354000A, 0x35E000A,
> - 0x368000A, 0x372000A, 0x37C000A, 0x386000A, 0x3900009, 0x399000A,
> - 0x3A30009, 0x3AD0009, 0x3B60009, 0x3BF000A, 0x3C90009, 0x3D20009,
> - 0x3DB0009, 0x3E40009, 0x3ED0009, 0x3F60009 },
> -
> - /* 1 --> gamma 1/2 */
> - { 0x7F, 0x800034, 0xB50028, 0xDE0021, 0x100001E, 0x11E001B,
> - 0x1390019, 0x1520017, 0x16A0015, 0x1800014, 0x1940014, 0x1A80013,
> - 0x1BB0012, 0x1CD0011, 0x1DF0010, 0x1EF0010, 0x200000F, 0x20F000F,
> - 0x21F000E, 0x22D000F, 0x23C000E, 0x24A000E, 0x258000D, 0x265000D,
> - 0x273000C, 0x27F000D, 0x28C000C, 0x299000C, 0x2A5000C, 0x2B1000B,
> - 0x2BC000C, 0x2C8000B, 0x2D3000C, 0x2DF000B, 0x2EA000A, 0x2F5000A,
> - 0x2FF000B, 0x30A000A, 0x314000B, 0x31F000A, 0x329000A, 0x333000A,
> - 0x33D0009, 0x3470009, 0x350000A, 0x35A0009, 0x363000A, 0x36D0009,
> - 0x3760009, 0x37F0009, 0x3880009, 0x3910009, 0x39A0009, 0x3A30009,
> - 0x3AC0008, 0x3B40009, 0x3BD0008, 0x3C60008, 0x3CE0008, 0x3D60009,
> - 0x3DF0008, 0x3E70008, 0x3EF0008, 0x3F70008 },
> -
> - /* 2 --> gamma 1/2.2 */
> - { 0x99, 0x9B0038, 0xD4002A, 0xFF0023, 0x122001F, 0x141001B,
> - 0x15D0019, 0x1760017, 0x18E0015, 0x1A30015, 0x1B80013, 0x1CC0012,
> - 0x1DE0011, 0x1F00010, 0x2010010, 0x2110010, 0x221000F, 0x230000F,
> - 0x23F000E, 0x24D000E, 0x25B000D, 0x269000C, 0x276000C, 0x283000C,
> - 0x28F000C, 0x29B000C, 0x2A7000C, 0x2B3000B, 0x2BF000B, 0x2CA000B,
> - 0x2D5000B, 0x2E0000A, 0x2EB000A, 0x2F5000A, 0x2FF000A, 0x30A000A,
> - 0x3140009, 0x31E0009, 0x327000A, 0x3310009, 0x33A0009, 0x3440009,
> - 0x34D0009, 0x3560009, 0x35F0009, 0x3680008, 0x3710008, 0x3790009,
> - 0x3820008, 0x38A0008, 0x3930008, 0x39B0008, 0x3A30008, 0x3AB0008,
> - 0x3B30008, 0x3BB0008, 0x3C30008, 0x3CB0007, 0x3D20008, 0x3DA0007,
> - 0x3E20007, 0x3E90007, 0x3F00008, 0x3F80007 },
> -};
> -
> -#define ISC_IS_FORMAT_RAW(mbus_code) \
> - (((mbus_code) & 0xf000) == 0x3000)
> -
> -static unsigned int debug;
> -module_param(debug, int, 0644);
> -MODULE_PARM_DESC(debug, "debug level (0-2)");
> -
> -static unsigned int sensor_preferred = 1;
> -module_param(sensor_preferred, uint, 0644);
> -MODULE_PARM_DESC(sensor_preferred,
> - "Sensor is preferred to output the specified format (1-on 0-off), default 1");
> -
> -static inline void isc_update_awb_ctrls(struct isc_device *isc)
> -{
> - struct isc_ctrls *ctrls = &isc->ctrls;
> -
> - regmap_write(isc->regmap, ISC_WB_O_RGR,
> - (ISC_WB_O_ZERO_VAL - (ctrls->offset[ISC_HIS_CFG_MODE_R])) |
> - ((ISC_WB_O_ZERO_VAL - ctrls->offset[ISC_HIS_CFG_MODE_GR]) << 16));
> - regmap_write(isc->regmap, ISC_WB_O_BGB,
> - (ISC_WB_O_ZERO_VAL - (ctrls->offset[ISC_HIS_CFG_MODE_B])) |
> - ((ISC_WB_O_ZERO_VAL - ctrls->offset[ISC_HIS_CFG_MODE_GB]) << 16));
> - regmap_write(isc->regmap, ISC_WB_G_RGR,
> - ctrls->gain[ISC_HIS_CFG_MODE_R] |
> - (ctrls->gain[ISC_HIS_CFG_MODE_GR] << 16));
> - regmap_write(isc->regmap, ISC_WB_G_BGB,
> - ctrls->gain[ISC_HIS_CFG_MODE_B] |
> - (ctrls->gain[ISC_HIS_CFG_MODE_GB] << 16));
> -}
> -
> -static inline void isc_reset_awb_ctrls(struct isc_device *isc)
> -{
> - int c;
> -
> - for (c = ISC_HIS_CFG_MODE_GR; c <= ISC_HIS_CFG_MODE_B; c++) {
> - /* gains have a fixed point at 9 decimals */
> - isc->ctrls.gain[c] = 1 << 9;
> - /* offsets are in 2's complements, the value
> - * will be substracted from ISC_WB_O_ZERO_VAL to obtain
> - * 2's complement of a value between 0 and
> - * ISC_WB_O_ZERO_VAL >> 1
> - */
> - isc->ctrls.offset[c] = ISC_WB_O_ZERO_VAL;
> - }
> -}
> -
> -static int isc_wait_clk_stable(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - struct regmap *regmap = isc_clk->regmap;
> - unsigned long timeout = jiffies + usecs_to_jiffies(1000);
> - unsigned int status;
> -
> - while (time_before(jiffies, timeout)) {
> - regmap_read(regmap, ISC_CLKSR, &status);
> - if (!(status & ISC_CLKSR_SIP))
> - return 0;
> -
> - usleep_range(10, 250);
> - }
> -
> - return -ETIMEDOUT;
> -}
> -
> -static int isc_clk_prepare(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> -
> - if (isc_clk->id == ISC_ISPCK)
> - pm_runtime_get_sync(isc_clk->dev);
> -
> - return isc_wait_clk_stable(hw);
> -}
> -
> -static void isc_clk_unprepare(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> -
> - isc_wait_clk_stable(hw);
> -
> - if (isc_clk->id == ISC_ISPCK)
> - pm_runtime_put_sync(isc_clk->dev);
> -}
> -
> -static int isc_clk_enable(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - u32 id = isc_clk->id;
> - struct regmap *regmap = isc_clk->regmap;
> - unsigned long flags;
> - unsigned int status;
> -
> - dev_dbg(isc_clk->dev, "ISC CLK: %s, div = %d, parent id = %d\n",
> - __func__, isc_clk->div, isc_clk->parent_id);
> -
> - spin_lock_irqsave(&isc_clk->lock, flags);
> - regmap_update_bits(regmap, ISC_CLKCFG,
> - ISC_CLKCFG_DIV_MASK(id) | ISC_CLKCFG_SEL_MASK(id),
> - (isc_clk->div << ISC_CLKCFG_DIV_SHIFT(id)) |
> - (isc_clk->parent_id << ISC_CLKCFG_SEL_SHIFT(id)));
> -
> - regmap_write(regmap, ISC_CLKEN, ISC_CLK(id));
> - spin_unlock_irqrestore(&isc_clk->lock, flags);
> -
> - regmap_read(regmap, ISC_CLKSR, &status);
> - if (status & ISC_CLK(id))
> - return 0;
> - else
> - return -EINVAL;
> -}
> -
> -static void isc_clk_disable(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - u32 id = isc_clk->id;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&isc_clk->lock, flags);
> - regmap_write(isc_clk->regmap, ISC_CLKDIS, ISC_CLK(id));
> - spin_unlock_irqrestore(&isc_clk->lock, flags);
> -}
> -
> -static int isc_clk_is_enabled(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - u32 status;
> -
> - if (isc_clk->id == ISC_ISPCK)
> - pm_runtime_get_sync(isc_clk->dev);
> -
> - regmap_read(isc_clk->regmap, ISC_CLKSR, &status);
> -
> - if (isc_clk->id == ISC_ISPCK)
> - pm_runtime_put_sync(isc_clk->dev);
> -
> - return status & ISC_CLK(isc_clk->id) ? 1 : 0;
> -}
> -
> -static unsigned long
> -isc_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> -
> - return DIV_ROUND_CLOSEST(parent_rate, isc_clk->div + 1);
> -}
> -
> -static int isc_clk_determine_rate(struct clk_hw *hw,
> - struct clk_rate_request *req)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - long best_rate = -EINVAL;
> - int best_diff = -1;
> - unsigned int i, div;
> -
> - for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
> - struct clk_hw *parent;
> - unsigned long parent_rate;
> -
> - parent = clk_hw_get_parent_by_index(hw, i);
> - if (!parent)
> - continue;
> -
> - parent_rate = clk_hw_get_rate(parent);
> - if (!parent_rate)
> - continue;
> -
> - for (div = 1; div < ISC_CLK_MAX_DIV + 2; div++) {
> - unsigned long rate;
> - int diff;
> -
> - rate = DIV_ROUND_CLOSEST(parent_rate, div);
> - diff = abs(req->rate - rate);
> -
> - if (best_diff < 0 || best_diff > diff) {
> - best_rate = rate;
> - best_diff = diff;
> - req->best_parent_rate = parent_rate;
> - req->best_parent_hw = parent;
> - }
> -
> - if (!best_diff || rate < req->rate)
> - break;
> - }
> -
> - if (!best_diff)
> - break;
> - }
> -
> - dev_dbg(isc_clk->dev,
> - "ISC CLK: %s, best_rate = %ld, parent clk: %s @ %ld\n",
> - __func__, best_rate,
> - __clk_get_name((req->best_parent_hw)->clk),
> - req->best_parent_rate);
> -
> - if (best_rate < 0)
> - return best_rate;
> -
> - req->rate = best_rate;
> -
> - return 0;
> -}
> -
> -static int isc_clk_set_parent(struct clk_hw *hw, u8 index)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> -
> - if (index >= clk_hw_get_num_parents(hw))
> - return -EINVAL;
> -
> - isc_clk->parent_id = index;
> -
> - return 0;
> -}
> -
> -static u8 isc_clk_get_parent(struct clk_hw *hw)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> -
> - return isc_clk->parent_id;
> -}
> -
> -static int isc_clk_set_rate(struct clk_hw *hw,
> - unsigned long rate,
> - unsigned long parent_rate)
> -{
> - struct isc_clk *isc_clk = to_isc_clk(hw);
> - u32 div;
> -
> - if (!rate)
> - return -EINVAL;
> -
> - div = DIV_ROUND_CLOSEST(parent_rate, rate);
> - if (div > (ISC_CLK_MAX_DIV + 1) || !div)
> - return -EINVAL;
> -
> - isc_clk->div = div - 1;
> -
> - return 0;
> -}
> -
> -static const struct clk_ops isc_clk_ops = {
> - .prepare = isc_clk_prepare,
> - .unprepare = isc_clk_unprepare,
> - .enable = isc_clk_enable,
> - .disable = isc_clk_disable,
> - .is_enabled = isc_clk_is_enabled,
> - .recalc_rate = isc_clk_recalc_rate,
> - .determine_rate = isc_clk_determine_rate,
> - .set_parent = isc_clk_set_parent,
> - .get_parent = isc_clk_get_parent,
> - .set_rate = isc_clk_set_rate,
> -};
> -
> -static int isc_clk_register(struct isc_device *isc, unsigned int id)
> -{
> - struct regmap *regmap = isc->regmap;
> - struct device_node *np = isc->dev->of_node;
> - struct isc_clk *isc_clk;
> - struct clk_init_data init;
> - const char *clk_name = np->name;
> - const char *parent_names[3];
> - int num_parents;
> -
> - num_parents = of_clk_get_parent_count(np);
> - if (num_parents < 1 || num_parents > 3)
> - return -EINVAL;
> -
> - if (num_parents > 2 && id == ISC_ISPCK)
> - num_parents = 2;
> -
> - of_clk_parent_fill(np, parent_names, num_parents);
> -
> - if (id == ISC_MCK)
> - of_property_read_string(np, "clock-output-names", &clk_name);
> - else
> - clk_name = "isc-ispck";
> -
> - init.parent_names = parent_names;
> - init.num_parents = num_parents;
> - init.name = clk_name;
> - init.ops = &isc_clk_ops;
> - init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
> -
> - isc_clk = &isc->isc_clks[id];
> - isc_clk->hw.init = &init;
> - isc_clk->regmap = regmap;
> - isc_clk->id = id;
> - isc_clk->dev = isc->dev;
> - spin_lock_init(&isc_clk->lock);
> -
> - isc_clk->clk = clk_register(isc->dev, &isc_clk->hw);
> - if (IS_ERR(isc_clk->clk)) {
> - dev_err(isc->dev, "%s: clock register fail\n", clk_name);
> - return PTR_ERR(isc_clk->clk);
> - } else if (id == ISC_MCK)
> - of_clk_add_provider(np, of_clk_src_simple_get, isc_clk->clk);
> -
> - return 0;
> -}
> -
> -static int isc_clk_init(struct isc_device *isc)
> -{
> - unsigned int i;
> - int ret;
> -
> - for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++)
> - isc->isc_clks[i].clk = ERR_PTR(-EINVAL);
> -
> - for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
> - ret = isc_clk_register(isc, i);
> - if (ret)
> - return ret;
> - }
> -
> - return 0;
> -}
> -
> -static void isc_clk_cleanup(struct isc_device *isc)
> -{
> - unsigned int i;
> -
> - of_clk_del_provider(isc->dev->of_node);
> -
> - for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
> - struct isc_clk *isc_clk = &isc->isc_clks[i];
> -
> - if (!IS_ERR(isc_clk->clk))
> - clk_unregister(isc_clk->clk);
> - }
> -}
> -
> -static int isc_queue_setup(struct vb2_queue *vq,
> - unsigned int *nbuffers, unsigned int *nplanes,
> - unsigned int sizes[], struct device *alloc_devs[])
> -{
> - struct isc_device *isc = vb2_get_drv_priv(vq);
> - unsigned int size = isc->fmt.fmt.pix.sizeimage;
> -
> - if (*nplanes)
> - return sizes[0] < size ? -EINVAL : 0;
> -
> - *nplanes = 1;
> - sizes[0] = size;
> -
> - return 0;
> -}
> -
> -static int isc_buffer_prepare(struct vb2_buffer *vb)
> -{
> - struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> - struct isc_device *isc = vb2_get_drv_priv(vb->vb2_queue);
> - unsigned long size = isc->fmt.fmt.pix.sizeimage;
> -
> - if (vb2_plane_size(vb, 0) < size) {
> - v4l2_err(&isc->v4l2_dev, "buffer too small (%lu < %lu)\n",
> - vb2_plane_size(vb, 0), size);
> - return -EINVAL;
> - }
> -
> - vb2_set_plane_payload(vb, 0, size);
> -
> - vbuf->field = isc->fmt.fmt.pix.field;
> -
> - return 0;
> -}
> -
> -static void isc_start_dma(struct isc_device *isc)
> -{
> - struct regmap *regmap = isc->regmap;
> - u32 sizeimage = isc->fmt.fmt.pix.sizeimage;
> - u32 dctrl_dview;
> - dma_addr_t addr0;
> - u32 h, w;
> -
> - h = isc->fmt.fmt.pix.height;
> - w = isc->fmt.fmt.pix.width;
> -
> - /*
> - * In case the sensor is not RAW, it will output a pixel (12-16 bits)
> - * with two samples on the ISC Data bus (which is 8-12)
> - * ISC will count each sample, so, we need to multiply these values
> - * by two, to get the real number of samples for the required pixels.
> - */
> - if (!ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code)) {
> - h <<= 1;
> - w <<= 1;
> - }
> -
> - /*
> - * We limit the column/row count that the ISC will output according
> - * to the configured resolution that we want.
> - * This will avoid the situation where the sensor is misconfigured,
> - * sending more data, and the ISC will just take it and DMA to memory,
> - * causing corruption.
> - */
> - regmap_write(regmap, ISC_PFE_CFG1,
> - (ISC_PFE_CFG1_COLMIN(0) & ISC_PFE_CFG1_COLMIN_MASK) |
> - (ISC_PFE_CFG1_COLMAX(w - 1) & ISC_PFE_CFG1_COLMAX_MASK));
> -
> - regmap_write(regmap, ISC_PFE_CFG2,
> - (ISC_PFE_CFG2_ROWMIN(0) & ISC_PFE_CFG2_ROWMIN_MASK) |
> - (ISC_PFE_CFG2_ROWMAX(h - 1) & ISC_PFE_CFG2_ROWMAX_MASK));
> -
> - regmap_update_bits(regmap, ISC_PFE_CFG0,
> - ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN,
> - ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN);
> -
> - addr0 = vb2_dma_contig_plane_dma_addr(&isc->cur_frm->vb.vb2_buf, 0);
> - regmap_write(regmap, ISC_DAD0, addr0);
> -
> - switch (isc->config.fourcc) {
> - case V4L2_PIX_FMT_YUV420:
> - regmap_write(regmap, ISC_DAD1, addr0 + (sizeimage * 2) / 3);
> - regmap_write(regmap, ISC_DAD2, addr0 + (sizeimage * 5) / 6);
> - break;
> - case V4L2_PIX_FMT_YUV422P:
> - regmap_write(regmap, ISC_DAD1, addr0 + sizeimage / 2);
> - regmap_write(regmap, ISC_DAD2, addr0 + (sizeimage * 3) / 4);
> - break;
> - default:
> - break;
> - }
> -
> - dctrl_dview = isc->config.dctrl_dview;
> -
> - regmap_write(regmap, ISC_DCTRL, dctrl_dview | ISC_DCTRL_IE_IS);
> - spin_lock(&isc->awb_lock);
> - regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_CAPTURE);
> - spin_unlock(&isc->awb_lock);
> -}
> -
> -static void isc_set_pipeline(struct isc_device *isc, u32 pipeline)
> -{
> - struct regmap *regmap = isc->regmap;
> - struct isc_ctrls *ctrls = &isc->ctrls;
> - u32 val, bay_cfg;
> - const u32 *gamma;
> - unsigned int i;
> -
> - /* WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB422-->SUB420 */
> - for (i = 0; i < ISC_PIPE_LINE_NODE_NUM; i++) {
> - val = pipeline & BIT(i) ? 1 : 0;
> - regmap_field_write(isc->pipeline[i], val);
> - }
> -
> - if (!pipeline)
> - return;
> -
> - bay_cfg = isc->config.sd_format->cfa_baycfg;
> -
> - if (ctrls->awb == ISC_WB_NONE)
> - isc_reset_awb_ctrls(isc);
> -
> - regmap_write(regmap, ISC_WB_CFG, bay_cfg);
> - isc_update_awb_ctrls(isc);
> -
> - regmap_write(regmap, ISC_CFA_CFG, bay_cfg | ISC_CFA_CFG_EITPOL);
> -
> - gamma = &isc_gamma_table[ctrls->gamma_index][0];
> - regmap_bulk_write(regmap, ISC_GAM_BENTRY, gamma, GAMMA_ENTRIES);
> - regmap_bulk_write(regmap, ISC_GAM_GENTRY, gamma, GAMMA_ENTRIES);
> - regmap_bulk_write(regmap, ISC_GAM_RENTRY, gamma, GAMMA_ENTRIES);
> -
> - /* Convert RGB to YUV */
> - regmap_write(regmap, ISC_CSC_YR_YG, 0x42 | (0x81 << 16));
> - regmap_write(regmap, ISC_CSC_YB_OY, 0x19 | (0x10 << 16));
> - regmap_write(regmap, ISC_CSC_CBR_CBG, 0xFDA | (0xFB6 << 16));
> - regmap_write(regmap, ISC_CSC_CBB_OCB, 0x70 | (0x80 << 16));
> - regmap_write(regmap, ISC_CSC_CRR_CRG, 0x70 | (0xFA2 << 16));
> - regmap_write(regmap, ISC_CSC_CRB_OCR, 0xFEE | (0x80 << 16));
> -
> - regmap_write(regmap, ISC_CBC_BRIGHT, ctrls->brightness);
> - regmap_write(regmap, ISC_CBC_CONTRAST, ctrls->contrast);
> -}
> -
> -static int isc_update_profile(struct isc_device *isc)
> -{
> - struct regmap *regmap = isc->regmap;
> - u32 sr;
> - int counter = 100;
> -
> - regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_UPPRO);
> -
> - regmap_read(regmap, ISC_CTRLSR, &sr);
> - while ((sr & ISC_CTRL_UPPRO) && counter--) {
> - usleep_range(1000, 2000);
> - regmap_read(regmap, ISC_CTRLSR, &sr);
> - }
> -
> - if (counter < 0) {
> - v4l2_warn(&isc->v4l2_dev, "Time out to update profile\n");
> - return -ETIMEDOUT;
> - }
> -
> - return 0;
> -}
> -
> -static void isc_set_histogram(struct isc_device *isc, bool enable)
> -{
> - struct regmap *regmap = isc->regmap;
> - struct isc_ctrls *ctrls = &isc->ctrls;
> -
> - if (enable) {
> - regmap_write(regmap, ISC_HIS_CFG,
> - ISC_HIS_CFG_MODE_GR |
> - (isc->config.sd_format->cfa_baycfg
> - << ISC_HIS_CFG_BAYSEL_SHIFT) |
> - ISC_HIS_CFG_RAR);
> - regmap_write(regmap, ISC_HIS_CTRL, ISC_HIS_CTRL_EN);
> - regmap_write(regmap, ISC_INTEN, ISC_INT_HISDONE);
> - ctrls->hist_id = ISC_HIS_CFG_MODE_GR;
> - isc_update_profile(isc);
> - regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_HISREQ);
> -
> - ctrls->hist_stat = HIST_ENABLED;
> - } else {
> - regmap_write(regmap, ISC_INTDIS, ISC_INT_HISDONE);
> - regmap_write(regmap, ISC_HIS_CTRL, ISC_HIS_CTRL_DIS);
> -
> - ctrls->hist_stat = HIST_DISABLED;
> - }
> -}
> -
> -static int isc_configure(struct isc_device *isc)
> -{
> - struct regmap *regmap = isc->regmap;
> - u32 pfe_cfg0, rlp_mode, dcfg, mask, pipeline;
> - struct isc_subdev_entity *subdev = isc->current_subdev;
> -
> - pfe_cfg0 = isc->config.sd_format->pfe_cfg0_bps;
> - rlp_mode = isc->config.rlp_cfg_mode;
> - pipeline = isc->config.bits_pipeline;
> -
> - dcfg = isc->config.dcfg_imode |
> - ISC_DCFG_YMBSIZE_BEATS8 | ISC_DCFG_CMBSIZE_BEATS8;
> -
> - pfe_cfg0 |= subdev->pfe_cfg0 | ISC_PFE_CFG0_MODE_PROGRESSIVE;
> - mask = ISC_PFE_CFG0_BPS_MASK | ISC_PFE_CFG0_HPOL_LOW |
> - ISC_PFE_CFG0_VPOL_LOW | ISC_PFE_CFG0_PPOL_LOW |
> - ISC_PFE_CFG0_MODE_MASK | ISC_PFE_CFG0_CCIR_CRC |
> - ISC_PFE_CFG0_CCIR656;
> -
> - regmap_update_bits(regmap, ISC_PFE_CFG0, mask, pfe_cfg0);
> -
> - regmap_update_bits(regmap, ISC_RLP_CFG, ISC_RLP_CFG_MODE_MASK,
> - rlp_mode);
> -
> - regmap_write(regmap, ISC_DCFG, dcfg);
> -
> - /* Set the pipeline */
> - isc_set_pipeline(isc, pipeline);
> -
> - /*
> - * The current implemented histogram is available for RAW R, B, GB, GR
> - * channels. We need to check if sensor is outputting RAW BAYER
> - */
> - if (isc->ctrls.awb &&
> - ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
> - isc_set_histogram(isc, true);
> - else
> - isc_set_histogram(isc, false);
> -
> - /* Update profile */
> - return isc_update_profile(isc);
> -}
> -
> -static int isc_start_streaming(struct vb2_queue *vq, unsigned int count)
> -{
> - struct isc_device *isc = vb2_get_drv_priv(vq);
> - struct regmap *regmap = isc->regmap;
> - struct isc_buffer *buf;
> - unsigned long flags;
> - int ret;
> -
> - /* Enable stream on the sub device */
> - ret = v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 1);
> - if (ret && ret != -ENOIOCTLCMD) {
> - v4l2_err(&isc->v4l2_dev, "stream on failed in subdev %d\n",
> - ret);
> - goto err_start_stream;
> - }
> -
> - pm_runtime_get_sync(isc->dev);
> -
> - ret = isc_configure(isc);
> - if (unlikely(ret))
> - goto err_configure;
> -
> - /* Enable DMA interrupt */
> - regmap_write(regmap, ISC_INTEN, ISC_INT_DDONE);
> -
> - spin_lock_irqsave(&isc->dma_queue_lock, flags);
> -
> - isc->sequence = 0;
> - isc->stop = false;
> - reinit_completion(&isc->comp);
> -
> - isc->cur_frm = list_first_entry(&isc->dma_queue,
> - struct isc_buffer, list);
> - list_del(&isc->cur_frm->list);
> -
> - isc_start_dma(isc);
> -
> - spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
> -
> - /* if we streaming from RAW, we can do one-shot white balance adj */
> - if (ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
> - v4l2_ctrl_activate(isc->do_wb_ctrl, true);
> -
> - return 0;
> -
> -err_configure:
> - pm_runtime_put_sync(isc->dev);
> -
> - v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
> -
> -err_start_stream:
> - spin_lock_irqsave(&isc->dma_queue_lock, flags);
> - list_for_each_entry(buf, &isc->dma_queue, list)
> - vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
> - INIT_LIST_HEAD(&isc->dma_queue);
> - spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
> -
> - return ret;
> -}
> -
> -static void isc_stop_streaming(struct vb2_queue *vq)
> -{
> - struct isc_device *isc = vb2_get_drv_priv(vq);
> - unsigned long flags;
> - struct isc_buffer *buf;
> - int ret;
> -
> - v4l2_ctrl_activate(isc->do_wb_ctrl, false);
> -
> - isc->stop = true;
> -
> - /* Wait until the end of the current frame */
> - if (isc->cur_frm && !wait_for_completion_timeout(&isc->comp, 5 * HZ))
> - v4l2_err(&isc->v4l2_dev,
> - "Timeout waiting for end of the capture\n");
> -
> - /* Disable DMA interrupt */
> - regmap_write(isc->regmap, ISC_INTDIS, ISC_INT_DDONE);
> -
> - pm_runtime_put_sync(isc->dev);
> -
> - /* Disable stream on the sub device */
> - ret = v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
> - if (ret && ret != -ENOIOCTLCMD)
> - v4l2_err(&isc->v4l2_dev, "stream off failed in subdev\n");
> -
> - /* Release all active buffers */
> - spin_lock_irqsave(&isc->dma_queue_lock, flags);
> - if (unlikely(isc->cur_frm)) {
> - vb2_buffer_done(&isc->cur_frm->vb.vb2_buf,
> - VB2_BUF_STATE_ERROR);
> - isc->cur_frm = NULL;
> - }
> - list_for_each_entry(buf, &isc->dma_queue, list)
> - vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> - INIT_LIST_HEAD(&isc->dma_queue);
> - spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
> -}
> -
> -static void isc_buffer_queue(struct vb2_buffer *vb)
> -{
> - struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> - struct isc_buffer *buf = container_of(vbuf, struct isc_buffer, vb);
> - struct isc_device *isc = vb2_get_drv_priv(vb->vb2_queue);
> - unsigned long flags;
> -
> - spin_lock_irqsave(&isc->dma_queue_lock, flags);
> - if (!isc->cur_frm && list_empty(&isc->dma_queue) &&
> - vb2_is_streaming(vb->vb2_queue)) {
> - isc->cur_frm = buf;
> - isc_start_dma(isc);
> - } else
> - list_add_tail(&buf->list, &isc->dma_queue);
> - spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
> -}
> -
> -static struct isc_format *find_format_by_fourcc(struct isc_device *isc,
> - unsigned int fourcc)
> -{
> - unsigned int num_formats = isc->num_user_formats;
> - struct isc_format *fmt;
> - unsigned int i;
> -
> - for (i = 0; i < num_formats; i++) {
> - fmt = isc->user_formats[i];
> - if (fmt->fourcc == fourcc)
> - return fmt;
> - }
> -
> - return NULL;
> -}
> -
> -static const struct vb2_ops isc_vb2_ops = {
> - .queue_setup = isc_queue_setup,
> - .wait_prepare = vb2_ops_wait_prepare,
> - .wait_finish = vb2_ops_wait_finish,
> - .buf_prepare = isc_buffer_prepare,
> - .start_streaming = isc_start_streaming,
> - .stop_streaming = isc_stop_streaming,
> - .buf_queue = isc_buffer_queue,
> -};
> -
> -static int isc_querycap(struct file *file, void *priv,
> - struct v4l2_capability *cap)
> -{
> - struct isc_device *isc = video_drvdata(file);
> -
> - strscpy(cap->driver, ATMEL_ISC_NAME, sizeof(cap->driver));
> - strscpy(cap->card, "Atmel Image Sensor Controller", sizeof(cap->card));
> - snprintf(cap->bus_info, sizeof(cap->bus_info),
> - "platform:%s", isc->v4l2_dev.name);
> -
> - return 0;
> -}
> -
> -static int isc_enum_fmt_vid_cap(struct file *file, void *priv,
> - struct v4l2_fmtdesc *f)
> -{
> - u32 index = f->index;
> - u32 i, supported_index;
> -
> - if (index < ARRAY_SIZE(controller_formats)) {
> - f->pixelformat = controller_formats[index].fourcc;
> - return 0;
> - }
> -
> - index -= ARRAY_SIZE(controller_formats);
> -
> - i = 0;
> - supported_index = 0;
> -
> - for (i = 0; i < ARRAY_SIZE(formats_list); i++) {
> - if (!ISC_IS_FORMAT_RAW(formats_list[i].mbus_code) ||
> - !formats_list[i].sd_support)
> - continue;
> - if (supported_index == index) {
> - f->pixelformat = formats_list[i].fourcc;
> - return 0;
> - }
> - supported_index++;
> - }
> -
> - return -EINVAL;
> -}
> -
> -static int isc_g_fmt_vid_cap(struct file *file, void *priv,
> - struct v4l2_format *fmt)
> -{
> - struct isc_device *isc = video_drvdata(file);
> -
> - *fmt = isc->fmt;
> -
> - return 0;
> -}
> -
> -/*
> - * Checks the current configured format, if ISC can output it,
> - * considering which type of format the ISC receives from the sensor
> - */
> -static int isc_try_validate_formats(struct isc_device *isc)
> -{
> - int ret;
> - bool bayer = false, yuv = false, rgb = false, grey = false;
> -
> - /* all formats supported by the RLP module are OK */
> - switch (isc->try_config.fourcc) {
> - case V4L2_PIX_FMT_SBGGR8:
> - case V4L2_PIX_FMT_SGBRG8:
> - case V4L2_PIX_FMT_SGRBG8:
> - case V4L2_PIX_FMT_SRGGB8:
> - case V4L2_PIX_FMT_SBGGR10:
> - case V4L2_PIX_FMT_SGBRG10:
> - case V4L2_PIX_FMT_SGRBG10:
> - case V4L2_PIX_FMT_SRGGB10:
> - case V4L2_PIX_FMT_SBGGR12:
> - case V4L2_PIX_FMT_SGBRG12:
> - case V4L2_PIX_FMT_SGRBG12:
> - case V4L2_PIX_FMT_SRGGB12:
> - ret = 0;
> - bayer = true;
> - break;
> -
> - case V4L2_PIX_FMT_YUV420:
> - case V4L2_PIX_FMT_YUV422P:
> - case V4L2_PIX_FMT_YUYV:
> - ret = 0;
> - yuv = true;
> - break;
> -
> - case V4L2_PIX_FMT_RGB565:
> - case V4L2_PIX_FMT_ABGR32:
> - case V4L2_PIX_FMT_XBGR32:
> - case V4L2_PIX_FMT_ARGB444:
> - case V4L2_PIX_FMT_ARGB555:
> - ret = 0;
> - rgb = true;
> - break;
> - case V4L2_PIX_FMT_GREY:
> - ret = 0;
> - grey = true;
> - break;
> - default:
> - /* any other different formats are not supported */
> - ret = -EINVAL;
> - }
> -
> - /* we cannot output RAW/Grey if we do not receive RAW */
> - if ((bayer || grey) &&
> - !ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code))
> - return -EINVAL;
> -
> - v4l2_dbg(1, debug, &isc->v4l2_dev,
> - "Format validation, requested rgb=%u, yuv=%u, grey=%u, bayer=%u\n",
> - rgb, yuv, grey, bayer);
> -
> - return ret;
> -}
> -
> -/*
> - * Configures the RLP and DMA modules, depending on the output format
> - * configured for the ISC.
> - * If direct_dump == true, just dump raw data 8 bits.
> - */
> -static int isc_try_configure_rlp_dma(struct isc_device *isc, bool direct_dump)
> -{
> - if (direct_dump) {
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT8;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 16;
> - return 0;
> - }
> -
> - switch (isc->try_config.fourcc) {
> - case V4L2_PIX_FMT_SBGGR8:
> - case V4L2_PIX_FMT_SGBRG8:
> - case V4L2_PIX_FMT_SGRBG8:
> - case V4L2_PIX_FMT_SRGGB8:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT8;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 8;
> - break;
> - case V4L2_PIX_FMT_SBGGR10:
> - case V4L2_PIX_FMT_SGBRG10:
> - case V4L2_PIX_FMT_SGRBG10:
> - case V4L2_PIX_FMT_SRGGB10:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT10;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 16;
> - break;
> - case V4L2_PIX_FMT_SBGGR12:
> - case V4L2_PIX_FMT_SGBRG12:
> - case V4L2_PIX_FMT_SGRBG12:
> - case V4L2_PIX_FMT_SRGGB12:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT12;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 16;
> - break;
> - case V4L2_PIX_FMT_RGB565:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_RGB565;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 16;
> - break;
> - case V4L2_PIX_FMT_ARGB444:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB444;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 16;
> - break;
> - case V4L2_PIX_FMT_ARGB555:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB555;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 16;
> - break;
> - case V4L2_PIX_FMT_ABGR32:
> - case V4L2_PIX_FMT_XBGR32:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB32;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED32;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 32;
> - break;
> - case V4L2_PIX_FMT_YUV420:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_YC420P;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PLANAR;
> - isc->try_config.bpp = 12;
> - break;
> - case V4L2_PIX_FMT_YUV422P:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_YC422P;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PLANAR;
> - isc->try_config.bpp = 16;
> - break;
> - case V4L2_PIX_FMT_YUYV:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED32;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 16;
> - break;
> - case V4L2_PIX_FMT_GREY:
> - isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DATY8;
> - isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
> - isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
> - isc->try_config.bpp = 8;
> - break;
> - default:
> - return -EINVAL;
> - }
> - return 0;
> -}
> -
> -/*
> - * Configuring pipeline modules, depending on which format the ISC outputs
> - * and considering which format it has as input from the sensor.
> - */
> -static int isc_try_configure_pipeline(struct isc_device *isc)
> -{
> - switch (isc->try_config.fourcc) {
> - case V4L2_PIX_FMT_RGB565:
> - case V4L2_PIX_FMT_ARGB555:
> - case V4L2_PIX_FMT_ARGB444:
> - case V4L2_PIX_FMT_ABGR32:
> - case V4L2_PIX_FMT_XBGR32:
> - /* if sensor format is RAW, we convert inside ISC */
> - if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> - isc->try_config.bits_pipeline = CFA_ENABLE |
> - WB_ENABLE | GAM_ENABLES;
> - } else {
> - isc->try_config.bits_pipeline = 0x0;
> - }
> - break;
> - case V4L2_PIX_FMT_YUV420:
> - /* if sensor format is RAW, we convert inside ISC */
> - if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> - isc->try_config.bits_pipeline = CFA_ENABLE |
> - CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
> - SUB420_ENABLE | SUB422_ENABLE | CBC_ENABLE;
> - } else {
> - isc->try_config.bits_pipeline = 0x0;
> - }
> - break;
> - case V4L2_PIX_FMT_YUV422P:
> - /* if sensor format is RAW, we convert inside ISC */
> - if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> - isc->try_config.bits_pipeline = CFA_ENABLE |
> - CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
> - SUB422_ENABLE | CBC_ENABLE;
> - } else {
> - isc->try_config.bits_pipeline = 0x0;
> - }
> - break;
> - case V4L2_PIX_FMT_YUYV:
> - /* if sensor format is RAW, we convert inside ISC */
> - if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> - isc->try_config.bits_pipeline = CFA_ENABLE |
> - CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
> - SUB422_ENABLE | CBC_ENABLE;
> - } else {
> - isc->try_config.bits_pipeline = 0x0;
> - }
> - break;
> - case V4L2_PIX_FMT_GREY:
> - if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
> - /* if sensor format is RAW, we convert inside ISC */
> - isc->try_config.bits_pipeline = CFA_ENABLE |
> - CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
> - CBC_ENABLE;
> - } else {
> - isc->try_config.bits_pipeline = 0x0;
> - }
> - break;
> - default:
> - isc->try_config.bits_pipeline = 0x0;
> - }
> - return 0;
> -}
> -
> -static int isc_try_fmt(struct isc_device *isc, struct v4l2_format *f,
> - u32 *code)
> -{
> - int i;
> - struct isc_format *sd_fmt = NULL, *direct_fmt = NULL;
> - struct v4l2_pix_format *pixfmt = &f->fmt.pix;
> - struct v4l2_subdev_pad_config pad_cfg;
> - struct v4l2_subdev_format format = {
> - .which = V4L2_SUBDEV_FORMAT_TRY,
> - };
> - u32 mbus_code;
> - int ret;
> - bool rlp_dma_direct_dump = false;
> -
> - if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> - return -EINVAL;
> -
> - /* Step 1: find a RAW format that is supported */
> - for (i = 0; i < isc->num_user_formats; i++) {
> - if (ISC_IS_FORMAT_RAW(isc->user_formats[i]->mbus_code)) {
> - sd_fmt = isc->user_formats[i];
> - break;
> - }
> - }
> - /* Step 2: We can continue with this RAW format, or we can look
> - * for better: maybe sensor supports directly what we need.
> - */
> - direct_fmt = find_format_by_fourcc(isc, pixfmt->pixelformat);
> -
> - /* Step 3: We have both. We decide given the module parameter which
> - * one to use.
> - */
> - if (direct_fmt && sd_fmt && sensor_preferred)
> - sd_fmt = direct_fmt;
> -
> - /* Step 4: we do not have RAW but we have a direct format. Use it. */
> - if (direct_fmt && !sd_fmt)
> - sd_fmt = direct_fmt;
> -
> - /* Step 5: if we are using a direct format, we need to package
> - * everything as 8 bit data and just dump it
> - */
> - if (sd_fmt == direct_fmt)
> - rlp_dma_direct_dump = true;
> -
> - /* Step 6: We have no format. This can happen if the userspace
> - * requests some weird/invalid format.
> - * In this case, default to whatever we have
> - */
> - if (!sd_fmt && !direct_fmt) {
> - sd_fmt = isc->user_formats[isc->num_user_formats - 1];
> - v4l2_dbg(1, debug, &isc->v4l2_dev,
> - "Sensor not supporting %.4s, using %.4s\n",
> - (char *)&pixfmt->pixelformat, (char *)&sd_fmt->fourcc);
> - }
> -
> - if (!sd_fmt) {
> - ret = -EINVAL;
> - goto isc_try_fmt_err;
> - }
> -
> - /* Step 7: Print out what we decided for debugging */
> - v4l2_dbg(1, debug, &isc->v4l2_dev,
> - "Preferring to have sensor using format %.4s\n",
> - (char *)&sd_fmt->fourcc);
> -
> - /* Step 8: at this moment we decided which format the subdev will use */
> - isc->try_config.sd_format = sd_fmt;
> -
> - /* Limit to Atmel ISC hardware capabilities */
> - if (pixfmt->width > ISC_MAX_SUPPORT_WIDTH)
> - pixfmt->width = ISC_MAX_SUPPORT_WIDTH;
> - if (pixfmt->height > ISC_MAX_SUPPORT_HEIGHT)
> - pixfmt->height = ISC_MAX_SUPPORT_HEIGHT;
> -
> - /*
> - * The mbus format is the one the subdev outputs.
> - * The pixels will be transferred in this format Sensor -> ISC
> - */
> - mbus_code = sd_fmt->mbus_code;
> -
> - /*
> - * Validate formats. If the required format is not OK, default to raw.
> - */
> -
> - isc->try_config.fourcc = pixfmt->pixelformat;
> -
> - if (isc_try_validate_formats(isc)) {
> - pixfmt->pixelformat = isc->try_config.fourcc = sd_fmt->fourcc;
> - /* Re-try to validate the new format */
> - ret = isc_try_validate_formats(isc);
> - if (ret)
> - goto isc_try_fmt_err;
> - }
> -
> - ret = isc_try_configure_rlp_dma(isc, rlp_dma_direct_dump);
> - if (ret)
> - goto isc_try_fmt_err;
> -
> - ret = isc_try_configure_pipeline(isc);
> - if (ret)
> - goto isc_try_fmt_err;
> -
> - v4l2_fill_mbus_format(&format.format, pixfmt, mbus_code);
> - ret = v4l2_subdev_call(isc->current_subdev->sd, pad, set_fmt,
> - &pad_cfg, &format);
> - if (ret < 0)
> - goto isc_try_fmt_subdev_err;
> -
> - v4l2_fill_pix_format(pixfmt, &format.format);
> -
> - pixfmt->field = V4L2_FIELD_NONE;
> - pixfmt->bytesperline = (pixfmt->width * isc->try_config.bpp) >> 3;
> - pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
> -
> - if (code)
> - *code = mbus_code;
> -
> - return 0;
> -
> -isc_try_fmt_err:
> - v4l2_err(&isc->v4l2_dev, "Could not find any possible format for a working pipeline\n");
> -isc_try_fmt_subdev_err:
> - memset(&isc->try_config, 0, sizeof(isc->try_config));
> -
> - return ret;
> -}
> -
> -static int isc_set_fmt(struct isc_device *isc, struct v4l2_format *f)
> -{
> - struct v4l2_subdev_format format = {
> - .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> - };
> - u32 mbus_code = 0;
> - int ret;
> -
> - ret = isc_try_fmt(isc, f, &mbus_code);
> - if (ret)
> - return ret;
> -
> - v4l2_fill_mbus_format(&format.format, &f->fmt.pix, mbus_code);
> - ret = v4l2_subdev_call(isc->current_subdev->sd, pad,
> - set_fmt, NULL, &format);
> - if (ret < 0)
> - return ret;
> -
> - isc->fmt = *f;
> -
> - if (isc->try_config.sd_format && isc->config.sd_format &&
> - isc->try_config.sd_format != isc->config.sd_format) {
> - isc->ctrls.hist_stat = HIST_INIT;
> - isc_reset_awb_ctrls(isc);
> - }
> - /* make the try configuration active */
> - isc->config = isc->try_config;
> -
> - v4l2_dbg(1, debug, &isc->v4l2_dev, "New ISC configuration in place\n");
> -
> - return 0;
> -}
> -
> -static int isc_s_fmt_vid_cap(struct file *file, void *priv,
> - struct v4l2_format *f)
> -{
> - struct isc_device *isc = video_drvdata(file);
> -
> - if (vb2_is_streaming(&isc->vb2_vidq))
> - return -EBUSY;
> -
> - return isc_set_fmt(isc, f);
> -}
> -
> -static int isc_try_fmt_vid_cap(struct file *file, void *priv,
> - struct v4l2_format *f)
> -{
> - struct isc_device *isc = video_drvdata(file);
> -
> - return isc_try_fmt(isc, f, NULL);
> -}
> -
> -static int isc_enum_input(struct file *file, void *priv,
> - struct v4l2_input *inp)
> -{
> - if (inp->index != 0)
> - return -EINVAL;
> -
> - inp->type = V4L2_INPUT_TYPE_CAMERA;
> - inp->std = 0;
> - strscpy(inp->name, "Camera", sizeof(inp->name));
> -
> - return 0;
> -}
> -
> -static int isc_g_input(struct file *file, void *priv, unsigned int *i)
> -{
> - *i = 0;
> -
> - return 0;
> -}
> -
> -static int isc_s_input(struct file *file, void *priv, unsigned int i)
> -{
> - if (i > 0)
> - return -EINVAL;
> -
> - return 0;
> -}
> -
> -static int isc_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
> -{
> - struct isc_device *isc = video_drvdata(file);
> -
> - return v4l2_g_parm_cap(video_devdata(file), isc->current_subdev->sd, a);
> -}
> -
> -static int isc_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
> -{
> - struct isc_device *isc = video_drvdata(file);
> -
> - return v4l2_s_parm_cap(video_devdata(file), isc->current_subdev->sd, a);
> -}
> -
> -static int isc_enum_framesizes(struct file *file, void *fh,
> - struct v4l2_frmsizeenum *fsize)
> -{
> - struct isc_device *isc = video_drvdata(file);
> - struct v4l2_subdev_frame_size_enum fse = {
> - .index = fsize->index,
> - .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> - };
> - int ret = -EINVAL;
> - int i;
> -
> - for (i = 0; i < isc->num_user_formats; i++)
> - if (isc->user_formats[i]->fourcc == fsize->pixel_format)
> - ret = 0;
> -
> - for (i = 0; i < ARRAY_SIZE(controller_formats); i++)
> - if (controller_formats[i].fourcc == fsize->pixel_format)
> - ret = 0;
> -
> - if (ret)
> - return ret;
> -
> - ret = v4l2_subdev_call(isc->current_subdev->sd, pad, enum_frame_size,
> - NULL, &fse);
> - if (ret)
> - return ret;
> -
> - fse.code = isc->config.sd_format->mbus_code;
> -
> - fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
> - fsize->discrete.width = fse.max_width;
> - fsize->discrete.height = fse.max_height;
> -
> - return 0;
> -}
> -
> -static int isc_enum_frameintervals(struct file *file, void *fh,
> - struct v4l2_frmivalenum *fival)
> -{
> - struct isc_device *isc = video_drvdata(file);
> - struct v4l2_subdev_frame_interval_enum fie = {
> - .index = fival->index,
> - .width = fival->width,
> - .height = fival->height,
> - .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> - };
> - int ret = -EINVAL;
> - int i;
> -
> - for (i = 0; i < isc->num_user_formats; i++)
> - if (isc->user_formats[i]->fourcc == fival->pixel_format)
> - ret = 0;
> -
> - for (i = 0; i < ARRAY_SIZE(controller_formats); i++)
> - if (controller_formats[i].fourcc == fival->pixel_format)
> - ret = 0;
> -
> - if (ret)
> - return ret;
> -
> - ret = v4l2_subdev_call(isc->current_subdev->sd, pad,
> - enum_frame_interval, NULL, &fie);
> - if (ret)
> - return ret;
> -
> - fie.code = isc->config.sd_format->mbus_code;
> - fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
> - fival->discrete = fie.interval;
> -
> - return 0;
> -}
> -
> -static const struct v4l2_ioctl_ops isc_ioctl_ops = {
> - .vidioc_querycap = isc_querycap,
> - .vidioc_enum_fmt_vid_cap = isc_enum_fmt_vid_cap,
> - .vidioc_g_fmt_vid_cap = isc_g_fmt_vid_cap,
> - .vidioc_s_fmt_vid_cap = isc_s_fmt_vid_cap,
> - .vidioc_try_fmt_vid_cap = isc_try_fmt_vid_cap,
> -
> - .vidioc_enum_input = isc_enum_input,
> - .vidioc_g_input = isc_g_input,
> - .vidioc_s_input = isc_s_input,
> -
> - .vidioc_reqbufs = vb2_ioctl_reqbufs,
> - .vidioc_querybuf = vb2_ioctl_querybuf,
> - .vidioc_qbuf = vb2_ioctl_qbuf,
> - .vidioc_expbuf = vb2_ioctl_expbuf,
> - .vidioc_dqbuf = vb2_ioctl_dqbuf,
> - .vidioc_create_bufs = vb2_ioctl_create_bufs,
> - .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> - .vidioc_streamon = vb2_ioctl_streamon,
> - .vidioc_streamoff = vb2_ioctl_streamoff,
> -
> - .vidioc_g_parm = isc_g_parm,
> - .vidioc_s_parm = isc_s_parm,
> - .vidioc_enum_framesizes = isc_enum_framesizes,
> - .vidioc_enum_frameintervals = isc_enum_frameintervals,
> -
> - .vidioc_log_status = v4l2_ctrl_log_status,
> - .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> - .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> -};
> -
> -static int isc_open(struct file *file)
> -{
> - struct isc_device *isc = video_drvdata(file);
> - struct v4l2_subdev *sd = isc->current_subdev->sd;
> - int ret;
> -
> - if (mutex_lock_interruptible(&isc->lock))
> - return -ERESTARTSYS;
> -
> - ret = v4l2_fh_open(file);
> - if (ret < 0)
> - goto unlock;
> -
> - if (!v4l2_fh_is_singular_file(file))
> - goto unlock;
> -
> - ret = v4l2_subdev_call(sd, core, s_power, 1);
> - if (ret < 0 && ret != -ENOIOCTLCMD) {
> - v4l2_fh_release(file);
> - goto unlock;
> - }
> -
> - ret = isc_set_fmt(isc, &isc->fmt);
> - if (ret) {
> - v4l2_subdev_call(sd, core, s_power, 0);
> - v4l2_fh_release(file);
> - }
> -
> -unlock:
> - mutex_unlock(&isc->lock);
> - return ret;
> -}
> -
> -static int isc_release(struct file *file)
> -{
> - struct isc_device *isc = video_drvdata(file);
> - struct v4l2_subdev *sd = isc->current_subdev->sd;
> - bool fh_singular;
> - int ret;
> -
> - mutex_lock(&isc->lock);
> -
> - fh_singular = v4l2_fh_is_singular_file(file);
> -
> - ret = _vb2_fop_release(file, NULL);
> -
> - if (fh_singular)
> - v4l2_subdev_call(sd, core, s_power, 0);
> -
> - mutex_unlock(&isc->lock);
> -
> - return ret;
> -}
> -
> -static const struct v4l2_file_operations isc_fops = {
> - .owner = THIS_MODULE,
> - .open = isc_open,
> - .release = isc_release,
> - .unlocked_ioctl = video_ioctl2,
> - .read = vb2_fop_read,
> - .mmap = vb2_fop_mmap,
> - .poll = vb2_fop_poll,
> -};
> -
> -static irqreturn_t isc_interrupt(int irq, void *dev_id)
> -{
> - struct isc_device *isc = (struct isc_device *)dev_id;
> - struct regmap *regmap = isc->regmap;
> - u32 isc_intsr, isc_intmask, pending;
> - irqreturn_t ret = IRQ_NONE;
> -
> - regmap_read(regmap, ISC_INTSR, &isc_intsr);
> - regmap_read(regmap, ISC_INTMASK, &isc_intmask);
> -
> - pending = isc_intsr & isc_intmask;
> -
> - if (likely(pending & ISC_INT_DDONE)) {
> - spin_lock(&isc->dma_queue_lock);
> - if (isc->cur_frm) {
> - struct vb2_v4l2_buffer *vbuf = &isc->cur_frm->vb;
> - struct vb2_buffer *vb = &vbuf->vb2_buf;
> -
> - vb->timestamp = ktime_get_ns();
> - vbuf->sequence = isc->sequence++;
> - vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> - isc->cur_frm = NULL;
> - }
> -
> - if (!list_empty(&isc->dma_queue) && !isc->stop) {
> - isc->cur_frm = list_first_entry(&isc->dma_queue,
> - struct isc_buffer, list);
> - list_del(&isc->cur_frm->list);
> -
> - isc_start_dma(isc);
> - }
> -
> - if (isc->stop)
> - complete(&isc->comp);
> -
> - ret = IRQ_HANDLED;
> - spin_unlock(&isc->dma_queue_lock);
> - }
> -
> - if (pending & ISC_INT_HISDONE) {
> - schedule_work(&isc->awb_work);
> - ret = IRQ_HANDLED;
> - }
> -
> - return ret;
> -}
> -
> -static void isc_hist_count(struct isc_device *isc, u32 *min, u32 *max)
> -{
> - struct regmap *regmap = isc->regmap;
> - struct isc_ctrls *ctrls = &isc->ctrls;
> - u32 *hist_count = &ctrls->hist_count[ctrls->hist_id];
> - u32 *hist_entry = &ctrls->hist_entry[0];
> - u32 i;
> -
> - *min = 0;
> - *max = HIST_ENTRIES;
> -
> - regmap_bulk_read(regmap, ISC_HIS_ENTRY, hist_entry, HIST_ENTRIES);
> -
> - *hist_count = 0;
> - /*
> - * we deliberately ignore the end of the histogram,
> - * the most white pixels
> - */
> - for (i = 1; i < HIST_ENTRIES; i++) {
> - if (*hist_entry && !*min)
> - *min = i;
> - if (*hist_entry)
> - *max = i;
> - *hist_count += i * (*hist_entry++);
> - }
> -
> - if (!*min)
> - *min = 1;
> -}
> -
> -static void isc_wb_update(struct isc_ctrls *ctrls)
> -{
> - u32 *hist_count = &ctrls->hist_count[0];
> - u32 c, offset[4];
> - u64 avg = 0;
> - /* We compute two gains, stretch gain and grey world gain */
> - u32 s_gain[4], gw_gain[4];
> -
> - /*
> - * According to Grey World, we need to set gains for R/B to normalize
> - * them towards the green channel.
> - * Thus we want to keep Green as fixed and adjust only Red/Blue
> - * Compute the average of the both green channels first
> - */
> - avg = (u64)hist_count[ISC_HIS_CFG_MODE_GR] +
> - (u64)hist_count[ISC_HIS_CFG_MODE_GB];
> - avg >>= 1;
> -
> - /* Green histogram is null, nothing to do */
> - if (!avg)
> - return;
> -
> - for (c = ISC_HIS_CFG_MODE_GR; c <= ISC_HIS_CFG_MODE_B; c++) {
> - /*
> - * the color offset is the minimum value of the histogram.
> - * we stretch this color to the full range by substracting
> - * this value from the color component.
> - */
> - offset[c] = ctrls->hist_minmax[c][HIST_MIN_INDEX];
> - /*
> - * The offset is always at least 1. If the offset is 1, we do
> - * not need to adjust it, so our result must be zero.
> - * the offset is computed in a histogram on 9 bits (0..512)
> - * but the offset in register is based on
> - * 12 bits pipeline (0..4096).
> - * we need to shift with the 3 bits that the histogram is
> - * ignoring
> - */
> - ctrls->offset[c] = (offset[c] - 1) << 3;
> -
> - /* the offset is then taken and converted to 2's complements */
> - if (!ctrls->offset[c])
> - ctrls->offset[c] = ISC_WB_O_ZERO_VAL;
> -
> - /*
> - * the stretch gain is the total number of histogram bins
> - * divided by the actual range of color component (Max - Min)
> - * If we compute gain like this, the actual color component
> - * will be stretched to the full histogram.
> - * We need to shift 9 bits for precision, we have 9 bits for
> - * decimals
> - */
> - s_gain[c] = (HIST_ENTRIES << 9) /
> - (ctrls->hist_minmax[c][HIST_MAX_INDEX] -
> - ctrls->hist_minmax[c][HIST_MIN_INDEX] + 1);
> -
> - /*
> - * Now we have to compute the gain w.r.t. the average.
> - * Add/lose gain to the component towards the average.
> - * If it happens that the component is zero, use the
> - * fixed point value : 1.0 gain.
> - */
> - if (hist_count[c])
> - gw_gain[c] = div_u64(avg << 9, hist_count[c]);
> - else
> - gw_gain[c] = 1 << 9;
> -
> - /* multiply both gains and adjust for decimals */
> - ctrls->gain[c] = s_gain[c] * gw_gain[c];
> - ctrls->gain[c] >>= 9;
> - }
> -}
> -
> -static void isc_awb_work(struct work_struct *w)
> -{
> - struct isc_device *isc =
> - container_of(w, struct isc_device, awb_work);
> - struct regmap *regmap = isc->regmap;
> - struct isc_ctrls *ctrls = &isc->ctrls;
> - u32 hist_id = ctrls->hist_id;
> - u32 baysel;
> - unsigned long flags;
> - u32 min, max;
> -
> - /* streaming is not active anymore */
> - if (isc->stop)
> - return;
> -
> - if (ctrls->hist_stat != HIST_ENABLED)
> - return;
> -
> - isc_hist_count(isc, &min, &max);
> - ctrls->hist_minmax[hist_id][HIST_MIN_INDEX] = min;
> - ctrls->hist_minmax[hist_id][HIST_MAX_INDEX] = max;
> -
> - if (hist_id != ISC_HIS_CFG_MODE_B) {
> - hist_id++;
> - } else {
> - isc_wb_update(ctrls);
> - hist_id = ISC_HIS_CFG_MODE_GR;
> - }
> -
> - ctrls->hist_id = hist_id;
> - baysel = isc->config.sd_format->cfa_baycfg << ISC_HIS_CFG_BAYSEL_SHIFT;
> -
> - /* if no more auto white balance, reset controls. */
> - if (ctrls->awb == ISC_WB_NONE)
> - isc_reset_awb_ctrls(isc);
> -
> - pm_runtime_get_sync(isc->dev);
> -
> - /*
> - * only update if we have all the required histograms and controls
> - * if awb has been disabled, we need to reset registers as well.
> - */
> - if (hist_id == ISC_HIS_CFG_MODE_GR || ctrls->awb == ISC_WB_NONE) {
> - /*
> - * It may happen that DMA Done IRQ will trigger while we are
> - * updating white balance registers here.
> - * In that case, only parts of the controls have been updated.
> - * We can avoid that by locking the section.
> - */
> - spin_lock_irqsave(&isc->awb_lock, flags);
> - isc_update_awb_ctrls(isc);
> - spin_unlock_irqrestore(&isc->awb_lock, flags);
> -
> - /*
> - * if we are doing just the one time white balance adjustment,
> - * we are basically done.
> - */
> - if (ctrls->awb == ISC_WB_ONETIME) {
> - v4l2_info(&isc->v4l2_dev,
> - "Completed one time white-balance adjustment.\n");
> - ctrls->awb = ISC_WB_NONE;
> - }
> - }
> - regmap_write(regmap, ISC_HIS_CFG, hist_id | baysel | ISC_HIS_CFG_RAR);
> - isc_update_profile(isc);
> - /* if awb has been disabled, we don't need to start another histogram */
> - if (ctrls->awb)
> - regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_HISREQ);
> -
> - pm_runtime_put_sync(isc->dev);
> -}
> -
> -static int isc_s_ctrl(struct v4l2_ctrl *ctrl)
> -{
> - struct isc_device *isc = container_of(ctrl->handler,
> - struct isc_device, ctrls.handler);
> - struct isc_ctrls *ctrls = &isc->ctrls;
> -
> - if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
> - return 0;
> -
> - switch (ctrl->id) {
> - case V4L2_CID_BRIGHTNESS:
> - ctrls->brightness = ctrl->val & ISC_CBC_BRIGHT_MASK;
> - break;
> - case V4L2_CID_CONTRAST:
> - ctrls->contrast = ctrl->val & ISC_CBC_CONTRAST_MASK;
> - break;
> - case V4L2_CID_GAMMA:
> - ctrls->gamma_index = ctrl->val;
> - break;
> - case V4L2_CID_AUTO_WHITE_BALANCE:
> - if (ctrl->val == 1)
> - ctrls->awb = ISC_WB_AUTO;
> - else
> - ctrls->awb = ISC_WB_NONE;
> -
> - /* we did not configure ISC yet */
> - if (!isc->config.sd_format)
> - break;
> -
> - if (ctrls->hist_stat != HIST_ENABLED)
> - isc_reset_awb_ctrls(isc);
> -
> - if (isc->ctrls.awb == ISC_WB_AUTO &&
> - vb2_is_streaming(&isc->vb2_vidq) &&
> - ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
> - isc_set_histogram(isc, true);
> -
> - break;
> - case V4L2_CID_DO_WHITE_BALANCE:
> - /* if AWB is enabled, do nothing */
> - if (ctrls->awb == ISC_WB_AUTO)
> - return 0;
> -
> - ctrls->awb = ISC_WB_ONETIME;
> - isc_set_histogram(isc, true);
> - v4l2_dbg(1, debug, &isc->v4l2_dev,
> - "One time white-balance started.\n");
> - break;
> - default:
> - return -EINVAL;
> - }
> -
> - return 0;
> -}
> -
> -static const struct v4l2_ctrl_ops isc_ctrl_ops = {
> - .s_ctrl = isc_s_ctrl,
> -};
> -
> -static int isc_ctrl_init(struct isc_device *isc)
> -{
> - const struct v4l2_ctrl_ops *ops = &isc_ctrl_ops;
> - struct isc_ctrls *ctrls = &isc->ctrls;
> - struct v4l2_ctrl_handler *hdl = &ctrls->handler;
> - int ret;
> -
> - ctrls->hist_stat = HIST_INIT;
> - isc_reset_awb_ctrls(isc);
> -
> - ret = v4l2_ctrl_handler_init(hdl, 5);
> - if (ret < 0)
> - return ret;
> -
> - ctrls->brightness = 0;
> - ctrls->contrast = 256;
> -
> - v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BRIGHTNESS, -1024, 1023, 1, 0);
> - v4l2_ctrl_new_std(hdl, ops, V4L2_CID_CONTRAST, -2048, 2047, 1, 256);
> - v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAMMA, 0, GAMMA_MAX, 1, 2);
> - v4l2_ctrl_new_std(hdl, ops, V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
> -
> - /* do_white_balance is a button, so min,max,step,default are ignored */
> - isc->do_wb_ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_DO_WHITE_BALANCE,
> - 0, 0, 0, 0);
> -
> - v4l2_ctrl_activate(isc->do_wb_ctrl, false);
> -
> - v4l2_ctrl_handler_setup(hdl);
> -
> - return 0;
> -}
> -
> -static int isc_async_bound(struct v4l2_async_notifier *notifier,
> - struct v4l2_subdev *subdev,
> - struct v4l2_async_subdev *asd)
> -{
> - struct isc_device *isc = container_of(notifier->v4l2_dev,
> - struct isc_device, v4l2_dev);
> - struct isc_subdev_entity *subdev_entity =
> - container_of(notifier, struct isc_subdev_entity, notifier);
> -
> - if (video_is_registered(&isc->video_dev)) {
> - v4l2_err(&isc->v4l2_dev, "only supports one sub-device.\n");
> - return -EBUSY;
> - }
> -
> - subdev_entity->sd = subdev;
> -
> - return 0;
> -}
> -
> -static void isc_async_unbind(struct v4l2_async_notifier *notifier,
> - struct v4l2_subdev *subdev,
> - struct v4l2_async_subdev *asd)
> -{
> - struct isc_device *isc = container_of(notifier->v4l2_dev,
> - struct isc_device, v4l2_dev);
> - cancel_work_sync(&isc->awb_work);
> - video_unregister_device(&isc->video_dev);
> - v4l2_ctrl_handler_free(&isc->ctrls.handler);
> -}
> -
> -static struct isc_format *find_format_by_code(unsigned int code, int *index)
> -{
> - struct isc_format *fmt = &formats_list[0];
> - unsigned int i;
> -
> - for (i = 0; i < ARRAY_SIZE(formats_list); i++) {
> - if (fmt->mbus_code == code) {
> - *index = i;
> - return fmt;
> - }
> -
> - fmt++;
> - }
> -
> - return NULL;
> -}
> -
> -static int isc_formats_init(struct isc_device *isc)
> -{
> - struct isc_format *fmt;
> - struct v4l2_subdev *subdev = isc->current_subdev->sd;
> - unsigned int num_fmts, i, j;
> - u32 list_size = ARRAY_SIZE(formats_list);
> - struct v4l2_subdev_mbus_code_enum mbus_code = {
> - .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> - };
> -
> - num_fmts = 0;
> - while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
> - NULL, &mbus_code)) {
> - mbus_code.index++;
> -
> - fmt = find_format_by_code(mbus_code.code, &i);
> - if (!fmt) {
> - v4l2_warn(&isc->v4l2_dev, "Mbus code %x not supported\n",
> - mbus_code.code);
> - continue;
> - }
> -
> - fmt->sd_support = true;
> - num_fmts++;
> - }
> -
> - if (!num_fmts)
> - return -ENXIO;
> -
> - isc->num_user_formats = num_fmts;
> - isc->user_formats = devm_kcalloc(isc->dev,
> - num_fmts, sizeof(*isc->user_formats),
> - GFP_KERNEL);
> - if (!isc->user_formats)
> - return -ENOMEM;
> -
> - fmt = &formats_list[0];
> - for (i = 0, j = 0; i < list_size; i++) {
> - if (fmt->sd_support)
> - isc->user_formats[j++] = fmt;
> - fmt++;
> - }
> -
> - return 0;
> -}
> -
> -static int isc_set_default_fmt(struct isc_device *isc)
> -{
> - struct v4l2_format f = {
> - .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
> - .fmt.pix = {
> - .width = VGA_WIDTH,
> - .height = VGA_HEIGHT,
> - .field = V4L2_FIELD_NONE,
> - .pixelformat = isc->user_formats[0]->fourcc,
> - },
> - };
> - int ret;
> -
> - ret = isc_try_fmt(isc, &f, NULL);
> - if (ret)
> - return ret;
> -
> - isc->fmt = f;
> - return 0;
> -}
> -
> -static int isc_async_complete(struct v4l2_async_notifier *notifier)
> -{
> - struct isc_device *isc = container_of(notifier->v4l2_dev,
> - struct isc_device, v4l2_dev);
> - struct video_device *vdev = &isc->video_dev;
> - struct vb2_queue *q = &isc->vb2_vidq;
> - int ret;
> -
> - INIT_WORK(&isc->awb_work, isc_awb_work);
> -
> - ret = v4l2_device_register_subdev_nodes(&isc->v4l2_dev);
> - if (ret < 0) {
> - v4l2_err(&isc->v4l2_dev, "Failed to register subdev nodes\n");
> - return ret;
> - }
> -
> - isc->current_subdev = container_of(notifier,
> - struct isc_subdev_entity, notifier);
> - mutex_init(&isc->lock);
> - init_completion(&isc->comp);
> -
> - /* Initialize videobuf2 queue */
> - q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> - q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
> - q->drv_priv = isc;
> - q->buf_struct_size = sizeof(struct isc_buffer);
> - q->ops = &isc_vb2_ops;
> - q->mem_ops = &vb2_dma_contig_memops;
> - q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> - q->lock = &isc->lock;
> - q->min_buffers_needed = 1;
> - q->dev = isc->dev;
> -
> - ret = vb2_queue_init(q);
> - if (ret < 0) {
> - v4l2_err(&isc->v4l2_dev,
> - "vb2_queue_init() failed: %d\n", ret);
> - return ret;
> - }
> -
> - /* Init video dma queues */
> - INIT_LIST_HEAD(&isc->dma_queue);
> - spin_lock_init(&isc->dma_queue_lock);
> - spin_lock_init(&isc->awb_lock);
> -
> - ret = isc_formats_init(isc);
> - if (ret < 0) {
> - v4l2_err(&isc->v4l2_dev,
> - "Init format failed: %d\n", ret);
> - return ret;
> - }
> -
> - ret = isc_set_default_fmt(isc);
> - if (ret) {
> - v4l2_err(&isc->v4l2_dev, "Could not set default format\n");
> - return ret;
> - }
> -
> - ret = isc_ctrl_init(isc);
> - if (ret) {
> - v4l2_err(&isc->v4l2_dev, "Init isc ctrols failed: %d\n", ret);
> - return ret;
> - }
> -
> - /* Register video device */
> - strscpy(vdev->name, ATMEL_ISC_NAME, sizeof(vdev->name));
> - vdev->release = video_device_release_empty;
> - vdev->fops = &isc_fops;
> - vdev->ioctl_ops = &isc_ioctl_ops;
> - vdev->v4l2_dev = &isc->v4l2_dev;
> - vdev->vfl_dir = VFL_DIR_RX;
> - vdev->queue = q;
> - vdev->lock = &isc->lock;
> - vdev->ctrl_handler = &isc->ctrls.handler;
> - vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
> - video_set_drvdata(vdev, isc);
> -
> - ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
> - if (ret < 0) {
> - v4l2_err(&isc->v4l2_dev,
> - "video_register_device failed: %d\n", ret);
> - return ret;
> - }
> -
> - return 0;
> -}
> -
> -static const struct v4l2_async_notifier_operations isc_async_ops = {
> - .bound = isc_async_bound,
> - .unbind = isc_async_unbind,
> - .complete = isc_async_complete,
> -};
> -
> -static void isc_subdev_cleanup(struct isc_device *isc)
> -{
> - struct isc_subdev_entity *subdev_entity;
> -
> - list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
> - v4l2_async_notifier_unregister(&subdev_entity->notifier);
> - v4l2_async_notifier_cleanup(&subdev_entity->notifier);
> - }
> -
> - INIT_LIST_HEAD(&isc->subdev_entities);
> -}
> -
> -static int isc_pipeline_init(struct isc_device *isc)
> -{
> - struct device *dev = isc->dev;
> - struct regmap *regmap = isc->regmap;
> - struct regmap_field *regs;
> - unsigned int i;
> -
> - /* WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB422-->SUB420 */
> - const struct reg_field regfields[ISC_PIPE_LINE_NODE_NUM] = {
> - REG_FIELD(ISC_WB_CTRL, 0, 0),
> - REG_FIELD(ISC_CFA_CTRL, 0, 0),
> - REG_FIELD(ISC_CC_CTRL, 0, 0),
> - REG_FIELD(ISC_GAM_CTRL, 0, 0),
> - REG_FIELD(ISC_GAM_CTRL, 1, 1),
> - REG_FIELD(ISC_GAM_CTRL, 2, 2),
> - REG_FIELD(ISC_GAM_CTRL, 3, 3),
> - REG_FIELD(ISC_CSC_CTRL, 0, 0),
> - REG_FIELD(ISC_CBC_CTRL, 0, 0),
> - REG_FIELD(ISC_SUB422_CTRL, 0, 0),
> - REG_FIELD(ISC_SUB420_CTRL, 0, 0),
> - };
> -
> - for (i = 0; i < ISC_PIPE_LINE_NODE_NUM; i++) {
> - regs = devm_regmap_field_alloc(dev, regmap, regfields[i]);
> - if (IS_ERR(regs))
> - return PTR_ERR(regs);
> -
> - isc->pipeline[i] = regs;
> - }
> -
> - return 0;
> -}
> -
> -static int isc_parse_dt(struct device *dev, struct isc_device *isc)
> -{
> - struct device_node *np = dev->of_node;
> - struct device_node *epn = NULL, *rem;
> - struct isc_subdev_entity *subdev_entity;
> - unsigned int flags;
> - int ret;
> -
> - INIT_LIST_HEAD(&isc->subdev_entities);
> -
> - while (1) {
> - struct v4l2_fwnode_endpoint v4l2_epn = { .bus_type = 0 };
> -
> - epn = of_graph_get_next_endpoint(np, epn);
> - if (!epn)
> - return 0;
> -
> - rem = of_graph_get_remote_port_parent(epn);
> - if (!rem) {
> - dev_notice(dev, "Remote device at %pOF not found\n",
> - epn);
> - continue;
> - }
> -
> - ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(epn),
> - &v4l2_epn);
> - if (ret) {
> - of_node_put(rem);
> - ret = -EINVAL;
> - dev_err(dev, "Could not parse the endpoint\n");
> - break;
> - }
> -
> - subdev_entity = devm_kzalloc(dev,
> - sizeof(*subdev_entity), GFP_KERNEL);
> - if (!subdev_entity) {
> - of_node_put(rem);
> - ret = -ENOMEM;
> - break;
> - }
> -
> - /* asd will be freed by the subsystem once it's added to the
> - * notifier list
> - */
> - subdev_entity->asd = kzalloc(sizeof(*subdev_entity->asd),
> - GFP_KERNEL);
> - if (!subdev_entity->asd) {
> - of_node_put(rem);
> - ret = -ENOMEM;
> - break;
> - }
> -
> - flags = v4l2_epn.bus.parallel.flags;
> -
> - if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
> - subdev_entity->pfe_cfg0 = ISC_PFE_CFG0_HPOL_LOW;
> -
> - if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
> - subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_VPOL_LOW;
> -
> - if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
> - subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_PPOL_LOW;
> -
> - if (v4l2_epn.bus_type == V4L2_MBUS_BT656)
> - subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_CCIR_CRC |
> - ISC_PFE_CFG0_CCIR656;
> -
> - subdev_entity->asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
> - subdev_entity->asd->match.fwnode =
> - of_fwnode_handle(rem);
> - list_add_tail(&subdev_entity->list, &isc->subdev_entities);
> - }
> -
> - of_node_put(epn);
> - return ret;
> -}
> -
> -/* regmap configuration */
> -#define ATMEL_ISC_REG_MAX 0xbfc
> -static const struct regmap_config isc_regmap_config = {
> - .reg_bits = 32,
> - .reg_stride = 4,
> - .val_bits = 32,
> - .max_register = ATMEL_ISC_REG_MAX,
> -};
> -
> -static int atmel_isc_probe(struct platform_device *pdev)
> -{
> - struct device *dev = &pdev->dev;
> - struct isc_device *isc;
> - struct resource *res;
> - void __iomem *io_base;
> - struct isc_subdev_entity *subdev_entity;
> - int irq;
> - int ret;
> -
> - isc = devm_kzalloc(dev, sizeof(*isc), GFP_KERNEL);
> - if (!isc)
> - return -ENOMEM;
> -
> - platform_set_drvdata(pdev, isc);
> - isc->dev = dev;
> -
> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - io_base = devm_ioremap_resource(dev, res);
> - if (IS_ERR(io_base))
> - return PTR_ERR(io_base);
> -
> - isc->regmap = devm_regmap_init_mmio(dev, io_base, &isc_regmap_config);
> - if (IS_ERR(isc->regmap)) {
> - ret = PTR_ERR(isc->regmap);
> - dev_err(dev, "failed to init register map: %d\n", ret);
> - return ret;
> - }
> -
> - irq = platform_get_irq(pdev, 0);
> - if (irq < 0) {
> - ret = irq;
> - dev_err(dev, "failed to get irq: %d\n", ret);
> - return ret;
> - }
> -
> - ret = devm_request_irq(dev, irq, isc_interrupt, 0,
> - ATMEL_ISC_NAME, isc);
> - if (ret < 0) {
> - dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
> - irq, ret);
> - return ret;
> - }
> -
> - ret = isc_pipeline_init(isc);
> - if (ret)
> - return ret;
> -
> - isc->hclock = devm_clk_get(dev, "hclock");
> - if (IS_ERR(isc->hclock)) {
> - ret = PTR_ERR(isc->hclock);
> - dev_err(dev, "failed to get hclock: %d\n", ret);
> - return ret;
> - }
> -
> - ret = clk_prepare_enable(isc->hclock);
> - if (ret) {
> - dev_err(dev, "failed to enable hclock: %d\n", ret);
> - return ret;
> - }
> -
> - ret = isc_clk_init(isc);
> - if (ret) {
> - dev_err(dev, "failed to init isc clock: %d\n", ret);
> - goto unprepare_hclk;
> - }
> -
> - isc->ispck = isc->isc_clks[ISC_ISPCK].clk;
> -
> - ret = clk_prepare_enable(isc->ispck);
> - if (ret) {
> - dev_err(dev, "failed to enable ispck: %d\n", ret);
> - goto unprepare_hclk;
> - }
> -
> - /* ispck should be greater or equal to hclock */
> - ret = clk_set_rate(isc->ispck, clk_get_rate(isc->hclock));
> - if (ret) {
> - dev_err(dev, "failed to set ispck rate: %d\n", ret);
> - goto unprepare_clk;
> - }
> -
> - ret = v4l2_device_register(dev, &isc->v4l2_dev);
> - if (ret) {
> - dev_err(dev, "unable to register v4l2 device.\n");
> - goto unprepare_clk;
> - }
> -
> - ret = isc_parse_dt(dev, isc);
> - if (ret) {
> - dev_err(dev, "fail to parse device tree\n");
> - goto unregister_v4l2_device;
> - }
> -
> - if (list_empty(&isc->subdev_entities)) {
> - dev_err(dev, "no subdev found\n");
> - ret = -ENODEV;
> - goto unregister_v4l2_device;
> - }
> -
> - list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
> - v4l2_async_notifier_init(&subdev_entity->notifier);
> -
> - ret = v4l2_async_notifier_add_subdev(&subdev_entity->notifier,
> - subdev_entity->asd);
> - if (ret) {
> - fwnode_handle_put(subdev_entity->asd->match.fwnode);
> - kfree(subdev_entity->asd);
> - goto cleanup_subdev;
> - }
> -
> - subdev_entity->notifier.ops = &isc_async_ops;
> -
> - ret = v4l2_async_notifier_register(&isc->v4l2_dev,
> - &subdev_entity->notifier);
> - if (ret) {
> - dev_err(dev, "fail to register async notifier\n");
> - goto cleanup_subdev;
> - }
> -
> - if (video_is_registered(&isc->video_dev))
> - break;
> - }
> -
> - pm_runtime_set_active(dev);
> - pm_runtime_enable(dev);
> - pm_request_idle(dev);
> -
> - return 0;
> -
> -cleanup_subdev:
> - isc_subdev_cleanup(isc);
> -
> -unregister_v4l2_device:
> - v4l2_device_unregister(&isc->v4l2_dev);
> -
> -unprepare_clk:
> - clk_disable_unprepare(isc->ispck);
> -unprepare_hclk:
> - clk_disable_unprepare(isc->hclock);
> -
> - isc_clk_cleanup(isc);
> -
> - return ret;
> -}
> -
> -static int atmel_isc_remove(struct platform_device *pdev)
> -{
> - struct isc_device *isc = platform_get_drvdata(pdev);
> -
> - pm_runtime_disable(&pdev->dev);
> - clk_disable_unprepare(isc->ispck);
> - clk_disable_unprepare(isc->hclock);
> -
> - isc_subdev_cleanup(isc);
> -
> - v4l2_device_unregister(&isc->v4l2_dev);
> -
> - isc_clk_cleanup(isc);
> -
> - return 0;
> -}
> -
> -static int __maybe_unused isc_runtime_suspend(struct device *dev)
> -{
> - struct isc_device *isc = dev_get_drvdata(dev);
> -
> - clk_disable_unprepare(isc->ispck);
> - clk_disable_unprepare(isc->hclock);
> -
> - return 0;
> -}
> -
> -static int __maybe_unused isc_runtime_resume(struct device *dev)
> -{
> - struct isc_device *isc = dev_get_drvdata(dev);
> - int ret;
> -
> - ret = clk_prepare_enable(isc->hclock);
> - if (ret)
> - return ret;
> -
> - return clk_prepare_enable(isc->ispck);
> -}
> -
> -static const struct dev_pm_ops atmel_isc_dev_pm_ops = {
> - SET_RUNTIME_PM_OPS(isc_runtime_suspend, isc_runtime_resume, NULL)
> -};
> -
> -static const struct of_device_id atmel_isc_of_match[] = {
> - { .compatible = "atmel,sama5d2-isc" },
> - { }
> -};
> -MODULE_DEVICE_TABLE(of, atmel_isc_of_match);
> -
> -static struct platform_driver atmel_isc_driver = {
> - .probe = atmel_isc_probe,
> - .remove = atmel_isc_remove,
> - .driver = {
> - .name = ATMEL_ISC_NAME,
> - .pm = &atmel_isc_dev_pm_ops,
> - .of_match_table = of_match_ptr(atmel_isc_of_match),
> - },
> -};
> -
> -module_platform_driver(atmel_isc_driver);
> -
> -MODULE_AUTHOR("Songjun Wu <songjun.wu@microchip.com>");
> -MODULE_DESCRIPTION("The V4L2 driver for Atmel-ISC");
> -MODULE_LICENSE("GPL v2");
> -MODULE_SUPPORTED_DEVICE("video");
> diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
> new file mode 100644
> index 0000000..0bd5dff
> --- /dev/null
> +++ b/drivers/media/platform/atmel/atmel-isc.h
> @@ -0,0 +1,208 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Microchip Image Sensor Controller (ISC) driver header file
> + *
> + * Copyright (C) 2016-2019 Microchip Technology, Inc.
> + *
> + * Author: Songjun Wu <songjun.wu@microchip.com>
> + * Author: Eugen Hristev <eugen.hristev@microchip.com>
> + *
> + */
> +#ifndef _ATMEL_ISC_H_
> +
> +#define ISC_MAX_SUPPORT_WIDTH 2592
> +#define ISC_MAX_SUPPORT_HEIGHT 1944
> +
> +#define ISC_CLK_MAX_DIV 255
> +
> +enum isc_clk_id {
> + ISC_ISPCK = 0,
> + ISC_MCK = 1,
> +};
> +
> +struct isc_clk {
> + struct clk_hw hw;
> + struct clk *clk;
> + struct regmap *regmap;
> + spinlock_t lock;
> + u8 id;
> + u8 parent_id;
> + u32 div;
> + struct device *dev;
> +};
> +
> +#define to_isc_clk(hw) container_of(hw, struct isc_clk, hw)
> +
> +struct isc_buffer {
> + struct vb2_v4l2_buffer vb;
> + struct list_head list;
> +};
> +
> +struct isc_subdev_entity {
> + struct v4l2_subdev *sd;
> + struct v4l2_async_subdev *asd;
> + struct v4l2_async_notifier notifier;
> +
> + u32 pfe_cfg0;
> +
> + struct list_head list;
> +};
> +
> +/*
> + * struct isc_format - ISC media bus format information
> + This structure represents the interface between the ISC
> + and the sensor. It's the input format received by
> + the ISC.
> + * @fourcc: Fourcc code for this format
> + * @mbus_code: V4L2 media bus format code.
> + * @cfa_baycfg: If this format is RAW BAYER, indicate the type of bayer.
> + this is either BGBG, RGRG, etc.
> + * @pfe_cfg0_bps: Number of hardware data lines connected to the ISC
> + */
> +
> +struct isc_format {
> + u32 fourcc;
> + u32 mbus_code;
> + u32 cfa_baycfg;
> +
> + bool sd_support;
> + u32 pfe_cfg0_bps;
> +};
> +
> +/* Pipeline bitmap */
> +#define WB_ENABLE BIT(0)
> +#define CFA_ENABLE BIT(1)
> +#define CC_ENABLE BIT(2)
> +#define GAM_ENABLE BIT(3)
> +#define GAM_BENABLE BIT(4)
> +#define GAM_GENABLE BIT(5)
> +#define GAM_RENABLE BIT(6)
> +#define CSC_ENABLE BIT(7)
> +#define CBC_ENABLE BIT(8)
> +#define SUB422_ENABLE BIT(9)
> +#define SUB420_ENABLE BIT(10)
> +
> +#define GAM_ENABLES (GAM_RENABLE | GAM_GENABLE | GAM_BENABLE | GAM_ENABLE)
> +
> +/*
> + * struct fmt_config - ISC format configuration and internal pipeline
> + This structure represents the internal configuration
> + of the ISC.
> + It also holds the format that ISC will present to v4l2.
> + * @sd_format: Pointer to an isc_format struct that holds the sensor
> + configuration.
> + * @fourcc: Fourcc code for this format.
> + * @bpp: Bytes per pixel in the current format.
> + * @rlp_cfg_mode: Configuration of the RLP (rounding, limiting packaging)
> + * @dcfg_imode: Configuration of the input of the DMA module
> + * @dctrl_dview: Configuration of the output of the DMA module
> + * @bits_pipeline: Configuration of the pipeline, which modules are enabled
> + */
> +struct fmt_config {
> + struct isc_format *sd_format;
> +
> + u32 fourcc;
> + u8 bpp;
> +
> + u32 rlp_cfg_mode;
> + u32 dcfg_imode;
> + u32 dctrl_dview;
> +
> + u32 bits_pipeline;
> +};
> +
> +#define HIST_ENTRIES 512
> +#define HIST_BAYER (ISC_HIS_CFG_MODE_B + 1)
> +
> +enum{
> + HIST_INIT = 0,
> + HIST_ENABLED,
> + HIST_DISABLED,
> +};
> +
> +struct isc_ctrls {
> + struct v4l2_ctrl_handler handler;
> +
> + u32 brightness;
> + u32 contrast;
> + u8 gamma_index;
> +#define ISC_WB_NONE 0
> +#define ISC_WB_AUTO 1
> +#define ISC_WB_ONETIME 2
> + u8 awb;
> +
> + /* one for each component : GR, R, GB, B */
> + u32 gain[HIST_BAYER];
> + u32 offset[HIST_BAYER];
> +
> + u32 hist_entry[HIST_ENTRIES];
> + u32 hist_count[HIST_BAYER];
> + u8 hist_id;
> + u8 hist_stat;
> +#define HIST_MIN_INDEX 0
> +#define HIST_MAX_INDEX 1
> + u32 hist_minmax[HIST_BAYER][2];
> +};
> +
> +#define ISC_PIPE_LINE_NODE_NUM 11
> +
> +struct isc_device {
> + struct regmap *regmap;
> + struct clk *hclock;
> + struct clk *ispck;
> + struct isc_clk isc_clks[2];
> +
> + struct device *dev;
> + struct v4l2_device v4l2_dev;
> + struct video_device video_dev;
> +
> + struct vb2_queue vb2_vidq;
> + spinlock_t dma_queue_lock;
> + struct list_head dma_queue;
> + struct isc_buffer *cur_frm;
> + unsigned int sequence;
> + bool stop;
> + struct completion comp;
> +
> + struct v4l2_format fmt;
> + struct isc_format **user_formats;
> + unsigned int num_user_formats;
> +
> + struct fmt_config config;
> + struct fmt_config try_config;
> +
> + struct isc_ctrls ctrls;
> + struct v4l2_ctrl *do_wb_ctrl;
> + struct work_struct awb_work;
> +
> + struct mutex lock;
> + spinlock_t awb_lock;
> +
> + struct regmap_field *pipeline[ISC_PIPE_LINE_NODE_NUM];
> +
> + struct isc_subdev_entity *current_subdev;
> + struct list_head subdev_entities;
> +};
> +
> +#define GAMMA_MAX 2
> +#define GAMMA_ENTRIES 64
> +
> +#define ATMEL_ISC_NAME "atmel-isc"
> +
> +/* module parameters */
> +extern unsigned int debug;
> +extern unsigned int sensor_preferred;
> +
> +extern struct isc_format formats_list[];
> +extern struct isc_format controller_formats[];
> +extern const u32 isc_gamma_table[GAMMA_MAX + 1][GAMMA_ENTRIES];
> +extern const struct regmap_config isc_regmap_config;
> +extern const struct v4l2_async_notifier_operations isc_async_ops;
> +
> +irqreturn_t isc_interrupt(int irq, void *dev_id);
> +int isc_pipeline_init(struct isc_device *isc);
> +int isc_clk_init(struct isc_device *isc);
> +void isc_subdev_cleanup(struct isc_device *isc);
> +void isc_clk_cleanup(struct isc_device *isc);
> +
> +#endif
> diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> new file mode 100644
> index 0000000..69faaaf
> --- /dev/null
> +++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> @@ -0,0 +1,344 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Microchip Image Sensor Controller (ISC) driver
> + *
> + * Copyright (C) 2016-2019 Microchip Technology, Inc.
> + *
> + * Author: Songjun Wu <songjun.wu@microchip.com>
> + * Author: Eugen Hristev <eugen.hristev@microchip.com>
> + *
> + *
> + * Sensor-->PFE-->WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB-->RLP-->DMA
> + *
> + * ISC video pipeline integrates the following submodules:
> + * PFE: Parallel Front End to sample the camera sensor input stream
> + * WB: Programmable white balance in the Bayer domain
> + * CFA: Color filter array interpolation module
> + * CC: Programmable color correction
> + * GAM: Gamma correction
> + * CSC: Programmable color space conversion
> + * CBC: Contrast and Brightness control
> + * SUB: This module performs YCbCr444 to YCbCr420 chrominance subsampling
> + * RLP: This module performs rounding, range limiting
> + * and packing of the incoming data
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/math64.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-image-sizes.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "atmel-isc-regs.h"
> +#include "atmel-isc.h"
> +
> +#define ISC_MAX_SUPPORT_WIDTH 2592
> +#define ISC_MAX_SUPPORT_HEIGHT 1944
> +
> +#define ISC_CLK_MAX_DIV 255
> +
> +static int isc_parse_dt(struct device *dev, struct isc_device *isc)
> +{
> + struct device_node *np = dev->of_node;
> + struct device_node *epn = NULL, *rem;
> + struct isc_subdev_entity *subdev_entity;
> + unsigned int flags;
> + int ret;
> +
> + INIT_LIST_HEAD(&isc->subdev_entities);
> +
> + while (1) {
> + struct v4l2_fwnode_endpoint v4l2_epn = { .bus_type = 0 };
> +
> + epn = of_graph_get_next_endpoint(np, epn);
> + if (!epn)
> + return 0;
> +
> + rem = of_graph_get_remote_port_parent(epn);
> + if (!rem) {
> + dev_notice(dev, "Remote device at %pOF not found\n",
> + epn);
> + continue;
> + }
> +
> + ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(epn),
> + &v4l2_epn);
> + if (ret) {
> + of_node_put(rem);
> + ret = -EINVAL;
> + dev_err(dev, "Could not parse the endpoint\n");
> + break;
> + }
> +
> + subdev_entity = devm_kzalloc(dev,
> + sizeof(*subdev_entity), GFP_KERNEL);
> + if (!subdev_entity) {
> + of_node_put(rem);
> + ret = -ENOMEM;
> + break;
> + }
> +
> + /* asd will be freed by the subsystem once it's added to the
> + * notifier list
> + */
> + subdev_entity->asd = kzalloc(sizeof(*subdev_entity->asd),
> + GFP_KERNEL);
> + if (!subdev_entity->asd) {
> + of_node_put(rem);
> + ret = -ENOMEM;
> + break;
> + }
> +
> + flags = v4l2_epn.bus.parallel.flags;
> +
> + if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
> + subdev_entity->pfe_cfg0 = ISC_PFE_CFG0_HPOL_LOW;
> +
> + if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
> + subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_VPOL_LOW;
> +
> + if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
> + subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_PPOL_LOW;
> +
> + if (v4l2_epn.bus_type == V4L2_MBUS_BT656)
> + subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_CCIR_CRC |
> + ISC_PFE_CFG0_CCIR656;
> +
> + subdev_entity->asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
> + subdev_entity->asd->match.fwnode =
> + of_fwnode_handle(rem);

Fits on the previous line.

> + list_add_tail(&subdev_entity->list, &isc->subdev_entities);
> + }
> +
> + of_node_put(epn);
> + return ret;
> +}
> +
> +static int atmel_isc_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct isc_device *isc;
> + struct resource *res;
> + void __iomem *io_base;
> + struct isc_subdev_entity *subdev_entity;
> + int irq;
> + int ret;
> +
> + isc = devm_kzalloc(dev, sizeof(*isc), GFP_KERNEL);
> + if (!isc)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, isc);
> + isc->dev = dev;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + io_base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(io_base))
> + return PTR_ERR(io_base);
> +
> + isc->regmap = devm_regmap_init_mmio(dev, io_base, &isc_regmap_config);
> + if (IS_ERR(isc->regmap)) {
> + ret = PTR_ERR(isc->regmap);
> + dev_err(dev, "failed to init register map: %d\n", ret);
> + return ret;
> + }
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + ret = irq;
> + dev_err(dev, "failed to get irq: %d\n", ret);
> + return ret;
> + }
> +
> + ret = devm_request_irq(dev, irq, isc_interrupt, 0,
> + ATMEL_ISC_NAME, isc);
> + if (ret < 0) {
> + dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
> + irq, ret);
> + return ret;
> + }
> +
> + ret = isc_pipeline_init(isc);
> + if (ret)
> + return ret;
> +
> + isc->hclock = devm_clk_get(dev, "hclock");
> + if (IS_ERR(isc->hclock)) {
> + ret = PTR_ERR(isc->hclock);
> + dev_err(dev, "failed to get hclock: %d\n", ret);
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(isc->hclock);
> + if (ret) {
> + dev_err(dev, "failed to enable hclock: %d\n", ret);
> + return ret;
> + }
> +
> + ret = isc_clk_init(isc);
> + if (ret) {
> + dev_err(dev, "failed to init isc clock: %d\n", ret);
> + goto unprepare_hclk;
> + }
> +
> + isc->ispck = isc->isc_clks[ISC_ISPCK].clk;
> +
> + ret = clk_prepare_enable(isc->ispck);

Do I understand this correctly --- the device generates ISPCK but also
needs it by itself?

> + if (ret) {
> + dev_err(dev, "failed to enable ispck: %d\n", ret);
> + goto unprepare_hclk;
> + }
> +
> + /* ispck should be greater or equal to hclock */
> + ret = clk_set_rate(isc->ispck, clk_get_rate(isc->hclock));
> + if (ret) {
> + dev_err(dev, "failed to set ispck rate: %d\n", ret);
> + goto unprepare_clk;
> + }
> +
> + ret = v4l2_device_register(dev, &isc->v4l2_dev);
> + if (ret) {
> + dev_err(dev, "unable to register v4l2 device.\n");
> + goto unprepare_clk;
> + }
> +
> + ret = isc_parse_dt(dev, isc);
> + if (ret) {
> + dev_err(dev, "fail to parse device tree\n");
> + goto unregister_v4l2_device;
> + }
> +
> + if (list_empty(&isc->subdev_entities)) {
> + dev_err(dev, "no subdev found\n");
> + ret = -ENODEV;
> + goto unregister_v4l2_device;
> + }
> +
> + list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
> + v4l2_async_notifier_init(&subdev_entity->notifier);
> +
> + ret = v4l2_async_notifier_add_subdev(&subdev_entity->notifier,
> + subdev_entity->asd);
> + if (ret) {
> + fwnode_handle_put(subdev_entity->asd->match.fwnode);
> + kfree(subdev_entity->asd);
> + goto cleanup_subdev;
> + }
> +
> + subdev_entity->notifier.ops = &isc_async_ops;
> +
> + ret = v4l2_async_notifier_register(&isc->v4l2_dev,
> + &subdev_entity->notifier);
> + if (ret) {
> + dev_err(dev, "fail to register async notifier\n");
> + goto cleanup_subdev;
> + }
> +
> + if (video_is_registered(&isc->video_dev))
> + break;
> + }
> +
> + pm_runtime_set_active(dev);
> + pm_runtime_enable(dev);
> + pm_request_idle(dev);
> +
> + return 0;
> +
> +cleanup_subdev:
> + isc_subdev_cleanup(isc);
> +
> +unregister_v4l2_device:
> + v4l2_device_unregister(&isc->v4l2_dev);
> +
> +unprepare_clk:
> + clk_disable_unprepare(isc->ispck);
> +unprepare_hclk:
> + clk_disable_unprepare(isc->hclock);
> +
> + isc_clk_cleanup(isc);
> +
> + return ret;
> +}
> +
> +static int atmel_isc_remove(struct platform_device *pdev)
> +{
> + struct isc_device *isc = platform_get_drvdata(pdev);
> +
> + pm_runtime_disable(&pdev->dev);
> + clk_disable_unprepare(isc->ispck);
> + clk_disable_unprepare(isc->hclock);
> +
> + isc_subdev_cleanup(isc);

This should take place before the three lines above it.

> +
> + v4l2_device_unregister(&isc->v4l2_dev);
> +
> + isc_clk_cleanup(isc);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused isc_runtime_suspend(struct device *dev)
> +{
> + struct isc_device *isc = dev_get_drvdata(dev);
> +
> + clk_disable_unprepare(isc->ispck);
> + clk_disable_unprepare(isc->hclock);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused isc_runtime_resume(struct device *dev)
> +{
> + struct isc_device *isc = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = clk_prepare_enable(isc->hclock);
> + if (ret)
> + return ret;
> +
> + return clk_prepare_enable(isc->ispck);

In case this fails, you'll need to disable_unprepare isc->hclock.

> +}
> +
> +static const struct dev_pm_ops atmel_isc_dev_pm_ops = {
> + SET_RUNTIME_PM_OPS(isc_runtime_suspend, isc_runtime_resume, NULL)
> +};
> +
> +static const struct of_device_id atmel_isc_of_match[] = {
> + { .compatible = "atmel,sama5d2-isc" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, atmel_isc_of_match);
> +
> +static struct platform_driver atmel_isc_driver = {
> + .probe = atmel_isc_probe,
> + .remove = atmel_isc_remove,
> + .driver = {
> + .name = ATMEL_ISC_NAME,
> + .pm = &atmel_isc_dev_pm_ops,
> + .of_match_table = of_match_ptr(atmel_isc_of_match),
> + },
> +};
> +
> +module_platform_driver(atmel_isc_driver);
> +
> +MODULE_AUTHOR("Songjun Wu <songjun.wu@microchip.com>");
> +MODULE_DESCRIPTION("The V4L2 driver for Atmel-ISC");
> +MODULE_LICENSE("GPL v2");
> +MODULE_SUPPORTED_DEVICE("video");

--
Kind regards,

Sakari Ailus

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