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SubjectRe: [PATCH v3 08/23] media: camss: Add CSID files
Hi Todor,

A few comments below. Looks pretty good!

On Mon, Jul 17, 2017 at 01:33:34PM +0300, Todor Tomov wrote:
> These files control the CSID modules which handle the protocol and application
> layer of the CSI2 receivers.
>
> Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
> ---
> .../media/platform/qcom/camss-8x16/camss-csid.c | 1073 ++++++++++++++++++++
> .../media/platform/qcom/camss-8x16/camss-csid.h | 82 ++
> 2 files changed, 1155 insertions(+)
> create mode 100644 drivers/media/platform/qcom/camss-8x16/camss-csid.c
> create mode 100644 drivers/media/platform/qcom/camss-8x16/camss-csid.h
>
> diff --git a/drivers/media/platform/qcom/camss-8x16/camss-csid.c b/drivers/media/platform/qcom/camss-8x16/camss-csid.c
> new file mode 100644
> index 0000000..2bf3415
> --- /dev/null
> +++ b/drivers/media/platform/qcom/camss-8x16/camss-csid.c
> @@ -0,0 +1,1073 @@
> +/*
> + * camss-csid.c
> + *
> + * Qualcomm MSM Camera Subsystem - CSID Module
> + *
> + * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
> + * Copyright (C) 2015-2017 Linaro Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +#include <linux/clk.h>
> +#include <linux/completion.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-subdev.h>
> +
> +#include "camss-csid.h"
> +#include "camss.h"
> +
> +#define MSM_CSID_NAME "msm_csid"
> +
> +#define CAMSS_CSID_HW_VERSION 0x0
> +#define CAMSS_CSID_CORE_CTRL_0 0x004
> +#define CAMSS_CSID_CORE_CTRL_1 0x008
> +#define CAMSS_CSID_RST_CMD 0x00c
> +#define CAMSS_CSID_CID_LUT_VC_n(n) (0x010 + 0x4 * (n))
> +#define CAMSS_CSID_CID_n_CFG(n) (0x020 + 0x4 * (n))
> +#define CAMSS_CSID_IRQ_CLEAR_CMD 0x060
> +#define CAMSS_CSID_IRQ_MASK 0x064
> +#define CAMSS_CSID_IRQ_STATUS 0x068
> +#define CAMSS_CSID_TG_CTRL 0x0a0
> +#define CAMSS_CSID_TG_VC_CFG 0x0a4
> +#define CAMSS_CSID_TG_VC_CFG_H_BLANKING 0x3ff
> +#define CAMSS_CSID_TG_VC_CFG_V_BLANKING 0x7f
> +#define CAMSS_CSID_TG_DT_n_CGG_0(n) (0x0ac + 0xc * (n))
> +#define CAMSS_CSID_TG_DT_n_CGG_1(n) (0x0b0 + 0xc * (n))
> +#define CAMSS_CSID_TG_DT_n_CGG_2(n) (0x0b4 + 0xc * (n))
> +
> +#define DATA_TYPE_EMBEDDED_DATA_8BIT 0x12
> +#define DATA_TYPE_YUV422_8BIT 0x1e
> +#define DATA_TYPE_RAW_6BIT 0x28
> +#define DATA_TYPE_RAW_8BIT 0x2a
> +#define DATA_TYPE_RAW_10BIT 0x2b
> +#define DATA_TYPE_RAW_12BIT 0x2c
> +
> +#define DECODE_FORMAT_UNCOMPRESSED_6_BIT 0x0
> +#define DECODE_FORMAT_UNCOMPRESSED_8_BIT 0x1
> +#define DECODE_FORMAT_UNCOMPRESSED_10_BIT 0x2
> +#define DECODE_FORMAT_UNCOMPRESSED_12_BIT 0x3
> +
> +#define CSID_RESET_TIMEOUT_MS 500
> +
> +static const struct {
> + u32 code;
> + u32 uncompressed;
> + u8 data_type;
> + u8 decode_format;
> + u8 uncompr_bpp;
> +} csid_input_fmts[] = {
> + {
> + MEDIA_BUS_FMT_UYVY8_2X8,
> + MEDIA_BUS_FMT_UYVY8_2X8,
> + DATA_TYPE_YUV422_8BIT,
> + DECODE_FORMAT_UNCOMPRESSED_8_BIT,
> + 16
> + },
> + {
> + MEDIA_BUS_FMT_VYUY8_2X8,
> + MEDIA_BUS_FMT_VYUY8_2X8,
> + DATA_TYPE_YUV422_8BIT,
> + DECODE_FORMAT_UNCOMPRESSED_8_BIT,
> + 16
> + },
> + {
> + MEDIA_BUS_FMT_YUYV8_2X8,
> + MEDIA_BUS_FMT_YUYV8_2X8,
> + DATA_TYPE_YUV422_8BIT,
> + DECODE_FORMAT_UNCOMPRESSED_8_BIT,
> + 16
> + },
> + {
> + MEDIA_BUS_FMT_YVYU8_2X8,
> + MEDIA_BUS_FMT_YVYU8_2X8,
> + DATA_TYPE_YUV422_8BIT,
> + DECODE_FORMAT_UNCOMPRESSED_8_BIT,
> + 16
> + },
> + {
> + MEDIA_BUS_FMT_SBGGR8_1X8,
> + MEDIA_BUS_FMT_SBGGR8_1X8,
> + DATA_TYPE_RAW_8BIT,
> + DECODE_FORMAT_UNCOMPRESSED_8_BIT,
> + 8
> + },
> + {
> + MEDIA_BUS_FMT_SGBRG8_1X8,
> + MEDIA_BUS_FMT_SGBRG8_1X8,
> + DATA_TYPE_RAW_8BIT,
> + DECODE_FORMAT_UNCOMPRESSED_8_BIT,
> + 8
> + },
> + {
> + MEDIA_BUS_FMT_SGRBG8_1X8,
> + MEDIA_BUS_FMT_SGRBG8_1X8,
> + DATA_TYPE_RAW_8BIT,
> + DECODE_FORMAT_UNCOMPRESSED_8_BIT,
> + 8
> + },
> + {
> + MEDIA_BUS_FMT_SRGGB8_1X8,
> + MEDIA_BUS_FMT_SRGGB8_1X8,
> + DATA_TYPE_RAW_8BIT,
> + DECODE_FORMAT_UNCOMPRESSED_8_BIT,
> + 8
> + },
> + {
> + MEDIA_BUS_FMT_SBGGR10_1X10,
> + MEDIA_BUS_FMT_SBGGR10_1X10,
> + DATA_TYPE_RAW_10BIT,
> + DECODE_FORMAT_UNCOMPRESSED_10_BIT,
> + 10
> + },
> + {
> + MEDIA_BUS_FMT_SGBRG10_1X10,
> + MEDIA_BUS_FMT_SGBRG10_1X10,
> + DATA_TYPE_RAW_10BIT,
> + DECODE_FORMAT_UNCOMPRESSED_10_BIT,
> + 10
> + },
> + {
> + MEDIA_BUS_FMT_SGRBG10_1X10,
> + MEDIA_BUS_FMT_SGRBG10_1X10,
> + DATA_TYPE_RAW_10BIT,
> + DECODE_FORMAT_UNCOMPRESSED_10_BIT,
> + 10
> + },
> + {
> + MEDIA_BUS_FMT_SRGGB10_1X10,
> + MEDIA_BUS_FMT_SRGGB10_1X10,
> + DATA_TYPE_RAW_10BIT,
> + DECODE_FORMAT_UNCOMPRESSED_10_BIT,
> + 10
> + },
> + {
> + MEDIA_BUS_FMT_SBGGR12_1X12,
> + MEDIA_BUS_FMT_SBGGR12_1X12,
> + DATA_TYPE_RAW_12BIT,
> + DECODE_FORMAT_UNCOMPRESSED_12_BIT,
> + 12
> + },
> + {
> + MEDIA_BUS_FMT_SGBRG12_1X12,
> + MEDIA_BUS_FMT_SGBRG12_1X12,
> + DATA_TYPE_RAW_12BIT,
> + DECODE_FORMAT_UNCOMPRESSED_12_BIT,
> + 12
> + },
> + {
> + MEDIA_BUS_FMT_SGRBG12_1X12,
> + MEDIA_BUS_FMT_SGRBG12_1X12,
> + DATA_TYPE_RAW_12BIT,
> + DECODE_FORMAT_UNCOMPRESSED_12_BIT,
> + 12
> + },
> + {
> + MEDIA_BUS_FMT_SRGGB12_1X12,
> + MEDIA_BUS_FMT_SRGGB12_1X12,
> + DATA_TYPE_RAW_12BIT,
> + DECODE_FORMAT_UNCOMPRESSED_12_BIT,
> + 12
> + }
> +};
> +
> +/*
> + * csid_isr - CSID module interrupt handler
> + * @irq: Interrupt line
> + * @dev: CSID device
> + *
> + * Return IRQ_HANDLED on success
> + */
> +static irqreturn_t csid_isr(int irq, void *dev)
> +{
> + struct csid_device *csid = dev;
> + u32 value;
> +
> + value = readl_relaxed(csid->base + CAMSS_CSID_IRQ_STATUS);
> + writel_relaxed(value, csid->base + CAMSS_CSID_IRQ_CLEAR_CMD);
> +
> + if ((value >> 11) & 0x1)
> + complete(&csid->reset_complete);
> +
> + return IRQ_HANDLED;
> +}
> +
> +/*
> + * csid_reset - Trigger reset on CSID module and wait to complete
> + * @csid: CSID device
> + *
> + * Return 0 on success or a negative error code otherwise
> + */
> +static int csid_reset(struct csid_device *csid)
> +{
> + unsigned long time;
> +
> + reinit_completion(&csid->reset_complete);
> +
> + writel_relaxed(0x7fff, csid->base + CAMSS_CSID_RST_CMD);
> +
> + time = wait_for_completion_timeout(&csid->reset_complete,
> + msecs_to_jiffies(CSID_RESET_TIMEOUT_MS));
> + if (!time) {
> + dev_err(to_device_index(csid, csid->id),
> + "CSID reset timeout\n");
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * csid_set_power - Power on/off CSID module
> + * @sd: CSID V4L2 subdevice
> + * @on: Requested power state
> + *
> + * Return 0 on success or a negative error code otherwise
> + */
> +static int csid_set_power(struct v4l2_subdev *sd, int on)
> +{
> + struct csid_device *csid = v4l2_get_subdevdata(sd);
> + struct device *dev = to_device_index(csid, csid->id);
> + int ret;
> +
> + if (on) {
> + u32 hw_version;
> +
> + ret = regulator_enable(csid->vdda);
> + if (ret < 0)
> + return ret;
> +
> + ret = camss_enable_clocks(csid->nclocks, csid->clock, dev);
> + if (ret < 0) {
> + regulator_disable(csid->vdda);
> + return ret;
> + }
> +
> + enable_irq(csid->irq);
> +
> + ret = csid_reset(csid);
> + if (ret < 0) {
> + disable_irq(csid->irq);
> + camss_disable_clocks(csid->nclocks, csid->clock);
> + regulator_disable(csid->vdda);
> + return ret;
> + }
> +
> + hw_version = readl_relaxed(csid->base + CAMSS_CSID_HW_VERSION);
> + dev_dbg(dev, "CSID HW Version = 0x%08x\n", hw_version);
> + } else {
> + disable_irq(csid->irq);
> + camss_disable_clocks(csid->nclocks, csid->clock);
> + ret = regulator_disable(csid->vdda);
> + }
> +
> + return ret;
> +}
> +
> +/*
> + * csid_get_uncompressed - map media bus format to uncompressed media bus format
> + * @code: media bus format code
> + *
> + * Return uncompressed media bus format code
> + */
> +static u32 csid_get_uncompressed(u32 code)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(csid_input_fmts); i++)
> + if (code == csid_input_fmts[i].code)
> + break;

Same here: return here, and unless a match is found, return a safe value
with __WARN(). The ones below as well.

You could also have a single function returning an entry to the array, and
just use the fields from that entry. Up to you.

> +
> + return csid_input_fmts[i].uncompressed;
> +}
> +
> +/*
> + * csid_get_data_type - map media bus format to data type
> + * @code: media bus format code
> + *
> + * Return data type code
> + */
> +static u8 csid_get_data_type(u32 code)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(csid_input_fmts); i++)
> + if (code == csid_input_fmts[i].code)
> + break;
> +
> + return csid_input_fmts[i].data_type;
> +}
> +
> +/*
> + * csid_get_decode_format - map media bus format to decode format
> + * @code: media bus format code
> + *
> + * Return decode format code
> + */
> +static u8 csid_get_decode_format(u32 code)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(csid_input_fmts); i++)
> + if (code == csid_input_fmts[i].code)
> + break;
> +
> + return csid_input_fmts[i].decode_format;
> +}
> +
> +/*
> + * csid_get_bpp - map media bus format to bits per pixel
> + * @code: media bus format code
> + *
> + * Return number of bits per pixel
> + */
> +static u8 csid_get_bpp(u32 code)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(csid_input_fmts); i++)
> + if (code == csid_input_fmts[i].uncompressed)
> + break;
> +
> + return csid_input_fmts[i].uncompr_bpp;
> +}
> +
> +/*
> + * csid_set_stream - Enable/disable streaming on CSID module
> + * @sd: CSID V4L2 subdevice
> + * @enable: Requested streaming state
> + *
> + * Main configuration of CSID module is also done here.
> + *
> + * Return 0 on success or a negative error code otherwise
> + */
> +static int csid_set_stream(struct v4l2_subdev *sd, int enable)
> +{
> + struct csid_device *csid = v4l2_get_subdevdata(sd);
> + struct csid_testgen_config *tg = &csid->testgen;
> + u32 val;
> +
> + if (enable) {
> + u8 vc = 0; /* Virtual Channel 0 */
> + u8 cid = vc * 4;

Would you like to comment what is cid? Multiplying by four and then taking
modulo later on looks odd.

> + u8 dt, dt_shift, df;
> + int ret;
> +
> + ret = v4l2_ctrl_handler_setup(&csid->ctrls);
> + if (ret < 0) {
> + dev_err(to_device_index(csid, csid->id),
> + "could not sync v4l2 controls: %d\n", ret);
> + return ret;
> + }
> +
> + if (!tg->enabled &&
> + !media_entity_remote_pad(&csid->pads[MSM_CSID_PAD_SINK])) {
> + return -ENOLINK;
> + }
> +
> + dt = csid_get_data_type(csid->fmt[MSM_CSID_PAD_SRC].code);
> +
> + if (tg->enabled) {
> + /* Config Test Generator */
> + u8 bpp = csid_get_bpp(csid->fmt[MSM_CSID_PAD_SRC].code);
> + u32 num_bytes_per_line =
> + csid->fmt[MSM_CSID_PAD_SRC].width * bpp / 8;
> + u32 num_lines = csid->fmt[MSM_CSID_PAD_SRC].height;
> +
> + /* 31:24 V blank, 23:13 H blank, 3:2 num of active DT */
> + /* 1:0 VC */
> + val = ((CAMSS_CSID_TG_VC_CFG_V_BLANKING & 0xff) << 24) |
> + ((CAMSS_CSID_TG_VC_CFG_H_BLANKING & 0x7ff) << 13);
> + writel_relaxed(val, csid->base + CAMSS_CSID_TG_VC_CFG);
> +
> + /* 28:16 bytes per lines, 12:0 num of lines */
> + val = ((num_bytes_per_line & 0x1fff) << 16) |
> + (num_lines & 0x1fff);
> + writel_relaxed(val, csid->base +
> + CAMSS_CSID_TG_DT_n_CGG_0(0));
> +
> + /* 5:0 data type */
> + val = dt;
> + writel_relaxed(val, csid->base +
> + CAMSS_CSID_TG_DT_n_CGG_1(0));
> +
> + /* 2:0 output test pattern */
> + val = tg->payload_mode;
> + writel_relaxed(val, csid->base +
> + CAMSS_CSID_TG_DT_n_CGG_2(0));
> + } else {
> + struct csid_phy_config *phy = &csid->phy;
> +
> + val = phy->lane_cnt - 1;
> + val |= phy->lane_assign << 4;
> +
> + writel_relaxed(val,
> + csid->base + CAMSS_CSID_CORE_CTRL_0);
> +
> + val = phy->csiphy_id << 17;
> + val |= 0x9;
> +
> + writel_relaxed(val,
> + csid->base + CAMSS_CSID_CORE_CTRL_1);
> + }
> +
> + /* Config LUT */
> +
> + dt_shift = (cid % 4) * 8;
> + df = csid_get_decode_format(csid->fmt[MSM_CSID_PAD_SINK].code);
> +
> + val = readl_relaxed(csid->base + CAMSS_CSID_CID_LUT_VC_n(vc));
> + val &= ~(0xff << dt_shift);
> + val |= dt << dt_shift;
> + writel_relaxed(val, csid->base + CAMSS_CSID_CID_LUT_VC_n(vc));
> +
> + val = (df << 4) | 0x3;
> + writel_relaxed(val, csid->base + CAMSS_CSID_CID_n_CFG(cid));
> +
> + if (tg->enabled) {
> + val = 0x00a06437;

Ouch. Magic numbers. Any idea what this might be about? It'd be nice to
have that the bits as #defines.

> + writel_relaxed(val, csid->base + CAMSS_CSID_TG_CTRL);
> + }
> + } else {
> + if (tg->enabled) {
> + val = 0x00a06436;
> + writel_relaxed(val, csid->base + CAMSS_CSID_TG_CTRL);
> + }
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * __csid_get_format - Get pointer to format structure
> + * @csid: CSID device
> + * @cfg: V4L2 subdev pad configuration
> + * @pad: pad from which format is requested
> + * @which: TRY or ACTIVE format
> + *
> + * Return pointer to TRY or ACTIVE format structure
> + */
> +static struct v4l2_mbus_framefmt *
> +__csid_get_format(struct csid_device *csid,
> + struct v4l2_subdev_pad_config *cfg,
> + unsigned int pad,
> + enum v4l2_subdev_format_whence which)
> +{
> + if (which == V4L2_SUBDEV_FORMAT_TRY)
> + return v4l2_subdev_get_try_format(&csid->subdev, cfg, pad);
> +
> + return &csid->fmt[pad];
> +}
> +
> +/*
> + * csid_try_format - Handle try format by pad subdev method
> + * @csid: CSID device
> + * @cfg: V4L2 subdev pad configuration
> + * @pad: pad on which format is requested
> + * @fmt: pointer to v4l2 format structure
> + * @which: wanted subdev format
> + */
> +static void csid_try_format(struct csid_device *csid,
> + struct v4l2_subdev_pad_config *cfg,
> + unsigned int pad,
> + struct v4l2_mbus_framefmt *fmt,
> + enum v4l2_subdev_format_whence which)
> +{
> + unsigned int i;
> +
> + switch (pad) {
> + case MSM_CSID_PAD_SINK:
> + /* Set format on sink pad */
> +
> + for (i = 0; i < ARRAY_SIZE(csid_input_fmts); i++)
> + if (fmt->code == csid_input_fmts[i].code)
> + break;
> +
> + /* If not found, use UYVY as default */
> + if (i >= ARRAY_SIZE(csid_input_fmts))
> + fmt->code = MEDIA_BUS_FMT_UYVY8_2X8;
> +
> + fmt->width = clamp_t(u32, fmt->width, 1, 8191);
> + fmt->height = clamp_t(u32, fmt->height, 1, 8191);
> +
> + if (fmt->field == V4L2_FIELD_ANY)
> + fmt->field = V4L2_FIELD_NONE;
> +
> + break;
> +
> + case MSM_CSID_PAD_SRC:
> + if (csid->testgen_mode->cur.val == 0) {
> + /* Test generator is disabled, keep pad formats */
> + /* in sync - set and return a format same as sink pad */
> + struct v4l2_mbus_framefmt format;
> +
> + format = *__csid_get_format(csid, cfg,
> + MSM_CSID_PAD_SINK, which);
> + format.code = csid_get_uncompressed(format.code);
> + *fmt = format;
> + } else {
> + /* Test generator is enabled, set format on source*/
> + /* pad to allow test generator usage */
> +
> + for (i = 0; i < ARRAY_SIZE(csid_input_fmts); i++)
> + if (csid_input_fmts[i].uncompressed ==
> + fmt->code)
> + break;
> +
> + /* If not found, use UYVY as default */
> + if (i >= ARRAY_SIZE(csid_input_fmts))
> + fmt->code = MEDIA_BUS_FMT_UYVY8_2X8;
> +
> + fmt->width = clamp_t(u32, fmt->width, 1, 8191);
> + fmt->height = clamp_t(u32, fmt->height, 1, 8191);
> +
> + fmt->field = V4L2_FIELD_NONE;
> + }
> + break;
> + }
> +
> + fmt->colorspace = V4L2_COLORSPACE_SRGB;
> +}
> +
> +/*
> + * csid_enum_mbus_code - Handle pixel format enumeration
> + * @sd: CSID V4L2 subdevice
> + * @cfg: V4L2 subdev pad configuration
> + * @code: pointer to v4l2_subdev_mbus_code_enum structure
> + * return -EINVAL or zero on success
> + */
> +static int csid_enum_mbus_code(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_mbus_code_enum *code)
> +{
> + struct csid_device *csid = v4l2_get_subdevdata(sd);
> + struct v4l2_mbus_framefmt *format;
> +
> + if (code->pad == MSM_CSID_PAD_SINK) {
> + if (code->index >= ARRAY_SIZE(csid_input_fmts))
> + return -EINVAL;
> +
> + code->code = csid_input_fmts[code->index].code;
> + } else {
> + if (csid->testgen_mode->cur.val == 0) {
> + if (code->index > 0)
> + return -EINVAL;
> +
> + format = __csid_get_format(csid, cfg, MSM_CSID_PAD_SINK,
> + code->which);
> +
> + code->code = csid_get_uncompressed(format->code);
> + } else {
> + if (code->index >= ARRAY_SIZE(csid_input_fmts))
> + return -EINVAL;
> +
> + code->code = csid_input_fmts[code->index].uncompressed;
> + }
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * csid_enum_frame_size - Handle frame size enumeration
> + * @sd: CSID V4L2 subdevice
> + * @cfg: V4L2 subdev pad configuration
> + * @fse: pointer to v4l2_subdev_frame_size_enum structure
> + * return -EINVAL or zero on success
> + */
> +static int csid_enum_frame_size(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_frame_size_enum *fse)
> +{
> + struct csid_device *csid = v4l2_get_subdevdata(sd);
> + struct v4l2_mbus_framefmt format;
> +
> + if (fse->index != 0)
> + return -EINVAL;
> +
> + format.code = fse->code;
> + format.width = 1;
> + format.height = 1;
> + csid_try_format(csid, cfg, fse->pad, &format, fse->which);
> + fse->min_width = format.width;
> + fse->min_height = format.height;
> +
> + if (format.code != fse->code)
> + return -EINVAL;
> +
> + format.code = fse->code;
> + format.width = -1;
> + format.height = -1;
> + csid_try_format(csid, cfg, fse->pad, &format, fse->which);
> + fse->max_width = format.width;
> + fse->max_height = format.height;
> +
> + return 0;
> +}
> +
> +/*
> + * csid_get_format - Handle get format by pads subdev method
> + * @sd: CSID V4L2 subdevice
> + * @cfg: V4L2 subdev pad configuration
> + * @fmt: pointer to v4l2 subdev format structure
> + *
> + * Return -EINVAL or zero on success
> + */
> +static int csid_get_format(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct csid_device *csid = v4l2_get_subdevdata(sd);
> + struct v4l2_mbus_framefmt *format;
> +
> + format = __csid_get_format(csid, cfg, fmt->pad, fmt->which);
> + if (format == NULL)
> + return -EINVAL;
> +
> + fmt->format = *format;
> +
> + return 0;
> +}
> +
> +/*
> + * csid_set_format - Handle set format by pads subdev method
> + * @sd: CSID V4L2 subdevice
> + * @cfg: V4L2 subdev pad configuration
> + * @fmt: pointer to v4l2 subdev format structure
> + *
> + * Return -EINVAL or zero on success
> + */
> +static int csid_set_format(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct csid_device *csid = v4l2_get_subdevdata(sd);
> + struct v4l2_mbus_framefmt *format;
> +
> + format = __csid_get_format(csid, cfg, fmt->pad, fmt->which);
> + if (format == NULL)
> + return -EINVAL;
> +
> + csid_try_format(csid, cfg, fmt->pad, &fmt->format, fmt->which);
> + *format = fmt->format;
> +
> + /* Propagate the format from sink to source */
> + if (fmt->pad == MSM_CSID_PAD_SINK) {
> + format = __csid_get_format(csid, cfg, MSM_CSID_PAD_SRC,
> + fmt->which);
> +
> + *format = fmt->format;
> + csid_try_format(csid, cfg, MSM_CSID_PAD_SRC, format,
> + fmt->which);
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * csid_init_formats - Initialize formats on all pads
> + * @sd: CSID V4L2 subdevice
> + * @fh: V4L2 subdev file handle
> + *
> + * Initialize all pad formats with default values.
> + *
> + * Return 0 on success or a negative error code otherwise
> + */
> +static int csid_init_formats(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> + struct v4l2_subdev_format format = {
> + .pad = MSM_CSID_PAD_SINK,
> + .which = fh ? V4L2_SUBDEV_FORMAT_TRY :
> + V4L2_SUBDEV_FORMAT_ACTIVE,
> + .format = {
> + .code = MEDIA_BUS_FMT_UYVY8_2X8,
> + .width = 1920,
> + .height = 1080
> + }
> + };
> +
> + return csid_set_format(sd, fh ? fh->pad : NULL, &format);
> +}
> +
> +static const char * const csid_test_pattern_menu[] = {
> + "Disabled",
> + "Incrementing",
> + "Alternating 55/AA",
> + "All Zeros",
> + "All Ones",

Does this refer to bits? Or pixel values?

> + "Random Data",

Pseudo-random data?

> +};
> +
> +/*
> + * csid_set_test_pattern - Set test generator's pattern mode
> + * @csid: CSID device
> + * @value: desired test pattern mode
> + *
> + * Return 0 on success or a negative error code otherwise
> + */
> +static int csid_set_test_pattern(struct csid_device *csid, s32 value)
> +{
> + struct csid_testgen_config *tg = &csid->testgen;
> +
> + /* If CSID is linked to CSIPHY, do not allow to enable test generator */
> + if (value && media_entity_remote_pad(&csid->pads[MSM_CSID_PAD_SINK]))
> + return -EBUSY;
> +
> + tg->enabled = !!value;
> +
> + switch (value) {
> + case 1:
> + tg->payload_mode = CSID_PAYLOAD_MODE_INCREMENTING;
> + break;
> + case 2:
> + tg->payload_mode = CSID_PAYLOAD_MODE_ALTERNATING_55_AA;
> + break;
> + case 3:
> + tg->payload_mode = CSID_PAYLOAD_MODE_ALL_ZEROES;
> + break;
> + case 4:
> + tg->payload_mode = CSID_PAYLOAD_MODE_ALL_ONES;
> + break;
> + case 5:
> + tg->payload_mode = CSID_PAYLOAD_MODE_RANDOM;
> + break;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * csid_s_ctrl - Handle set control subdev method
> + * @ctrl: pointer to v4l2 control structure
> + *
> + * Return 0 on success or a negative error code otherwise
> + */
> +static int csid_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct csid_device *csid = container_of(ctrl->handler,
> + struct csid_device, ctrls);
> + int ret = -EINVAL;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_TEST_PATTERN:
> + ret = csid_set_test_pattern(csid, ctrl->val);
> + break;
> + }
> +
> + return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops csid_ctrl_ops = {
> + .s_ctrl = csid_s_ctrl,
> +};
> +
> +/*
> + * msm_csid_subdev_init - Initialize CSID device structure and resources
> + * @csid: CSID device
> + * @res: CSID module resources table
> + * @id: CSID module id
> + *
> + * Return 0 on success or a negative error code otherwise
> + */
> +int msm_csid_subdev_init(struct csid_device *csid,
> + const struct resources *res, u8 id)
> +{
> + struct device *dev = to_device_index(csid, id);
> + struct platform_device *pdev = to_platform_device(dev);
> + struct resource *r;
> + int i;
> + int ret;
> +
> + csid->id = id;
> +
> + /* Memory */
> +
> + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, res->reg[0]);
> + csid->base = devm_ioremap_resource(dev, r);
> + if (IS_ERR(csid->base)) {
> + dev_err(dev, "could not map memory\n");
> + return PTR_ERR(csid->base);
> + }
> +
> + /* Interrupt */
> +
> + r = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
> + res->interrupt[0]);
> + if (!r) {
> + dev_err(dev, "missing IRQ\n");
> + return -EINVAL;
> + }
> +
> + csid->irq = r->start;
> + snprintf(csid->irq_name, sizeof(csid->irq_name), "%s_%s%d",
> + dev_name(dev), MSM_CSID_NAME, csid->id);
> + ret = devm_request_irq(dev, csid->irq, csid_isr,
> + IRQF_TRIGGER_RISING, csid->irq_name, csid);
> + if (ret < 0) {
> + dev_err(dev, "request_irq failed: %d\n", ret);
> + return ret;
> + }
> +
> + disable_irq(csid->irq);
> +
> + /* Clocks */
> +
> + csid->nclocks = 0;
> + while (res->clock[csid->nclocks])
> + csid->nclocks++;
> +
> + csid->clock = devm_kzalloc(dev, csid->nclocks * sizeof(*csid->clock),
> + GFP_KERNEL);
> + if (!csid->clock)
> + return -ENOMEM;
> +
> + for (i = 0; i < csid->nclocks; i++) {
> + csid->clock[i] = devm_clk_get(dev, res->clock[i]);
> + if (IS_ERR(csid->clock[i]))
> + return PTR_ERR(csid->clock[i]);
> +
> + if (res->clock_rate[i]) {
> + long clk_rate = clk_round_rate(csid->clock[i],
> + res->clock_rate[i]);
> + if (clk_rate < 0) {
> + dev_err(to_device_index(csid, csid->id),
> + "clk round rate failed: %ld\n",
> + clk_rate);
> + return -EINVAL;
> + }
> + ret = clk_set_rate(csid->clock[i], clk_rate);
> + if (ret < 0) {
> + dev_err(to_device_index(csid, csid->id),
> + "clk set rate failed: %d\n", ret);
> + return ret;
> + }
> + }
> + }
> +
> + /* Regulator */
> +
> + csid->vdda = devm_regulator_get(dev, res->regulator[0]);
> + if (IS_ERR(csid->vdda)) {
> + dev_err(dev, "could not get regulator\n");
> + return PTR_ERR(csid->vdda);
> + }
> +
> + init_completion(&csid->reset_complete);
> +
> + return 0;
> +}
> +
> +/*
> + * msm_csid_get_csid_id - Get CSID HW module id
> + * @entity: Pointer to CSID media entity structure
> + * @id: Return CSID HW module id here
> + */
> +void msm_csid_get_csid_id(struct media_entity *entity, u8 *id)
> +{
> + struct v4l2_subdev *sd;
> + struct csid_device *csid;
> +
> + sd = media_entity_to_v4l2_subdev(entity);
> + csid = v4l2_get_subdevdata(sd);

You could do this in variable declaration.

> +
> + *id = csid->id;
> +}
> +
> +/*
> + * csid_get_lane_assign - Calculate CSI2 lane assign configuration parameter
> + * @lane_cfg - CSI2 lane configuration
> + *
> + * Return lane assign
> + */
> +static u32 csid_get_lane_assign(struct csiphy_lanes_cfg *lane_cfg)
> +{
> + u32 lane_assign = 0;
> + int i;
> +
> + for (i = 0; i < lane_cfg->num_data; i++)
> + lane_assign |= lane_cfg->data[i].pos << (i * 4);
> +
> + return lane_assign;
> +}
> +
> +/*
> + * csid_link_setup - Setup CSID connections
> + * @entity: Pointer to media entity structure
> + * @local: Pointer to local pad
> + * @remote: Pointer to remote pad
> + * @flags: Link flags
> + *
> + * Return 0 on success
> + */
> +static int csid_link_setup(struct media_entity *entity,
> + const struct media_pad *local,
> + const struct media_pad *remote, u32 flags)
> +{
> + if (flags & MEDIA_LNK_FL_ENABLED)
> + if (media_entity_remote_pad(local))
> + return -EBUSY;
> +
> + if ((local->flags & MEDIA_PAD_FL_SINK) &&
> + (flags & MEDIA_LNK_FL_ENABLED)) {
> + struct v4l2_subdev *sd;
> + struct csid_device *csid;
> + struct csiphy_device *csiphy;
> + struct csiphy_lanes_cfg *lane_cfg;
> + struct v4l2_subdev_format format = { 0 };
> +
> + sd = media_entity_to_v4l2_subdev(entity);
> + csid = v4l2_get_subdevdata(sd);

Ditto. Up to you.

> +
> + /* If test generator is enabled */
> + /* do not allow a link from CSIPHY to CSID */
> + if (csid->testgen_mode->cur.val != 0)
> + return -EBUSY;
> +
> + sd = media_entity_to_v4l2_subdev(remote->entity);
> + csiphy = v4l2_get_subdevdata(sd);
> +
> + /* If a sensor is not linked to CSIPHY */
> + /* do no allow a link from CSIPHY to CSID */
> + if (!csiphy->cfg.csi2)
> + return -EPERM;
> +
> + csid->phy.csiphy_id = csiphy->id;
> +
> + lane_cfg = &csiphy->cfg.csi2->lane_cfg;
> + csid->phy.lane_cnt = lane_cfg->num_data;
> + csid->phy.lane_assign = csid_get_lane_assign(lane_cfg);
> +
> + /* Reset format on source pad to sink pad format */
> + format.pad = MSM_CSID_PAD_SRC;
> + format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> + csid_set_format(&csid->subdev, NULL, &format);
> + }
> +
> + return 0;
> +}
> +
> +static const struct v4l2_subdev_core_ops csid_core_ops = {
> + .s_power = csid_set_power,
> +};
> +
> +static const struct v4l2_subdev_video_ops csid_video_ops = {
> + .s_stream = csid_set_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops csid_pad_ops = {
> + .enum_mbus_code = csid_enum_mbus_code,
> + .enum_frame_size = csid_enum_frame_size,
> + .get_fmt = csid_get_format,
> + .set_fmt = csid_set_format,
> +};
> +
> +static const struct v4l2_subdev_ops csid_v4l2_ops = {
> + .core = &csid_core_ops,
> + .video = &csid_video_ops,
> + .pad = &csid_pad_ops,
> +};
> +
> +static const struct v4l2_subdev_internal_ops csid_v4l2_internal_ops = {
> + .open = csid_init_formats,
> +};
> +
> +static const struct media_entity_operations csid_media_ops = {
> + .link_setup = csid_link_setup,
> + .link_validate = v4l2_subdev_link_validate,
> +};
> +
> +/*
> + * msm_csid_register_entity - Register subdev node for CSID module
> + * @csid: CSID device
> + * @v4l2_dev: V4L2 device
> + *
> + * Return 0 on success or a negative error code otherwise
> + */
> +int msm_csid_register_entity(struct csid_device *csid,
> + struct v4l2_device *v4l2_dev)
> +{
> + struct v4l2_subdev *sd = &csid->subdev;
> + struct media_pad *pads = csid->pads;
> + struct device *dev = to_device_index(csid, csid->id);
> + int ret;
> +
> + v4l2_subdev_init(sd, &csid_v4l2_ops);
> + sd->internal_ops = &csid_v4l2_internal_ops;
> + sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + snprintf(sd->name, ARRAY_SIZE(sd->name), "%s%d",
> + MSM_CSID_NAME, csid->id);
> + v4l2_set_subdevdata(sd, csid);
> +
> + ret = v4l2_ctrl_handler_init(&csid->ctrls, 1);
> + if (ret < 0) {
> + dev_err(dev, "Failed to init ctrl handler: %d\n", ret);
> + return ret;
> + }
> +
> + csid->testgen_mode = v4l2_ctrl_new_std_menu_items(&csid->ctrls,
> + &csid_ctrl_ops, V4L2_CID_TEST_PATTERN,
> + ARRAY_SIZE(csid_test_pattern_menu) - 1, 0, 0,
> + csid_test_pattern_menu);
> +
> + if (csid->ctrls.error) {
> + dev_err(dev, "Failed to init ctrl: %d\n", csid->ctrls.error);
> + ret = csid->ctrls.error;
> + goto free_ctrl;
> + }
> +
> + csid->subdev.ctrl_handler = &csid->ctrls;
> +
> + ret = csid_init_formats(sd, NULL);
> + if (ret < 0) {
> + dev_err(dev, "Failed to init format: %d\n", ret);
> + goto free_ctrl;
> + }
> +
> + pads[MSM_CSID_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
> + pads[MSM_CSID_PAD_SRC].flags = MEDIA_PAD_FL_SOURCE;
> +
> + sd->entity.function = MEDIA_ENT_F_IO_V4L;
> + sd->entity.ops = &csid_media_ops;
> + ret = media_entity_pads_init(&sd->entity, MSM_CSID_PADS_NUM, pads);
> + if (ret < 0) {
> + dev_err(dev, "Failed to init media entity: %d\n", ret);
> + goto free_ctrl;
> + }
> +
> + ret = v4l2_device_register_subdev(v4l2_dev, sd);
> + if (ret < 0) {
> + dev_err(dev, "Failed to register subdev: %d\n", ret);
> + goto media_cleanup;
> + }
> +
> + return 0;
> +
> +media_cleanup:
> + media_entity_cleanup(&sd->entity);
> +free_ctrl:
> + v4l2_ctrl_handler_free(&csid->ctrls);
> +
> + return ret;
> +}
> +
> +/*
> + * msm_csid_unregister_entity - Unregister CSID module subdev node
> + * @csid: CSID device
> + */
> +void msm_csid_unregister_entity(struct csid_device *csid)
> +{
> + v4l2_device_unregister_subdev(&csid->subdev);
> + v4l2_ctrl_handler_free(&csid->ctrls);

media_entity_cleanup() --- although it's currently empty. It's been a
while...

> +}
> diff --git a/drivers/media/platform/qcom/camss-8x16/camss-csid.h b/drivers/media/platform/qcom/camss-8x16/camss-csid.h
> new file mode 100644
> index 0000000..3186c11
> --- /dev/null
> +++ b/drivers/media/platform/qcom/camss-8x16/camss-csid.h
> @@ -0,0 +1,82 @@
> +/*
> + * camss-csid.h
> + *
> + * Qualcomm MSM Camera Subsystem - CSID Module
> + *
> + * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
> + * Copyright (C) 2015-2017 Linaro Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +#ifndef QC_MSM_CAMSS_CSID_H
> +#define QC_MSM_CAMSS_CSID_H
> +
> +#include <linux/clk.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-mediabus.h>
> +#include <media/v4l2-subdev.h>
> +
> +#define MSM_CSID_PAD_SINK 0
> +#define MSM_CSID_PAD_SRC 1
> +#define MSM_CSID_PADS_NUM 2
> +
> +enum csid_payload_mode {
> + CSID_PAYLOAD_MODE_INCREMENTING = 0,
> + CSID_PAYLOAD_MODE_ALTERNATING_55_AA = 1,
> + CSID_PAYLOAD_MODE_ALL_ZEROES = 2,
> + CSID_PAYLOAD_MODE_ALL_ONES = 3,
> + CSID_PAYLOAD_MODE_RANDOM = 4,
> + CSID_PAYLOAD_MODE_USER_SPECIFIED = 5,
> +};
> +
> +struct csid_testgen_config {
> + u8 enabled;
> + enum csid_payload_mode payload_mode;
> +};
> +
> +struct csid_phy_config {
> + u8 csiphy_id;
> + u8 lane_cnt;
> + u32 lane_assign;
> +};
> +
> +struct csid_device {
> + u8 id;
> + struct v4l2_subdev subdev;
> + struct media_pad pads[MSM_CSID_PADS_NUM];
> + void __iomem *base;
> + u32 irq;
> + char irq_name[30];
> + struct clk **clock;
> + int nclocks;
> + struct regulator *vdda;
> + struct completion reset_complete;
> + struct csid_testgen_config testgen;
> + struct csid_phy_config phy;
> + struct v4l2_mbus_framefmt fmt[MSM_CSID_PADS_NUM];
> + struct v4l2_ctrl_handler ctrls;
> + struct v4l2_ctrl *testgen_mode;
> +};
> +
> +struct resources;
> +
> +int msm_csid_subdev_init(struct csid_device *csid,
> + const struct resources *res, u8 id);
> +
> +int msm_csid_register_entity(struct csid_device *csid,
> + struct v4l2_device *v4l2_dev);
> +
> +void msm_csid_unregister_entity(struct csid_device *csid);
> +
> +void msm_csid_get_csid_id(struct media_entity *entity, u8 *id);
> +
> +#endif /* QC_MSM_CAMSS_CSID_H */

--
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi XMPP: sailus@retiisi.org.uk

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