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SubjectRe: [PATCH 2/3] drm/rockchip: Add ROCKCHIP DW MIPI DSI controller driver
Hi Nickey,

Several people already made comments on the initial version of this
patch [1], and I don't think you've caught them all here yet. I'll
repeat a few. Not sure if I've caught them all.

[1] https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/780120

On Tue, Nov 28, 2017 at 09:13:35AM +0800, Nickey Yang wrote:
> Add the ROCKCHIP DSI controller driver that uses the Synopsys DesignWare
> MIPI DSI host controller bridge.
>
> Signed-off-by: Nickey Yang <nickey.yang@rock-chips.com>
> ---
> drivers/gpu/drm/rockchip/Kconfig | 2 +-
> drivers/gpu/drm/rockchip/Makefile | 2 +-
> drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 1349 -----------------------
> drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c | 756 +++++++++++++
> drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 2 +-
> drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 2 +-
> 6 files changed, 760 insertions(+), 1353 deletions(-)
> delete mode 100644 drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> create mode 100644 drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c
>

...

> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c
> new file mode 100644
> index 0000000..32be430
> --- /dev/null
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c
> @@ -0,0 +1,756 @@
> +/*
> + * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
> + * Author:
> + * Chris Zhong <zyw@rock-chips.com>
> + * Nickey Yang <nickey.yang@rock-chips.com>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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.
> + *
> + * License terms: GNU General Public License (GPL), version 2
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/iopoll.h>
> +#include <linux/math64.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <drm/drmP.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/bridge/dw_mipi_dsi.h>
> +#include <video/mipi_display.h>
> +#include <linux/regmap.h>
> +#include <drm/drm_of.h>
> +#include <linux/mfd/syscon.h>
> +
> +#include "rockchip_drm_drv.h"
> +#include "rockchip_drm_vop.h"
> +
> +#define DSI_PHY_TST_CTRL0 0xb4
> +#define PHY_TESTCLK BIT(1)
> +#define PHY_UNTESTCLK 0
> +#define PHY_TESTCLR BIT(0)
> +#define PHY_UNTESTCLR 0
> +
> +#define DSI_PHY_TST_CTRL1 0xb8
> +#define PHY_TESTEN BIT(16)
> +#define PHY_UNTESTEN 0
> +#define PHY_TESTDOUT(n) (((n) & 0xff) << 8)
> +#define PHY_TESTDIN(n) (((n) & 0xff) << 0)
> +
> +#define BYPASS_VCO_RANGE BIT(7)
> +#define VCO_RANGE_CON_SEL(val) (((val) & 0x7) << 3)
> +#define VCO_IN_CAP_CON_DEFAULT (0x0 << 1)
> +#define VCO_IN_CAP_CON_LOW (0x1 << 1)
> +#define VCO_IN_CAP_CON_HIGH (0x2 << 1)
> +#define REF_BIAS_CUR_SEL BIT(0)
> +
> +#define CP_CURRENT_3UA 0x1
> +#define CP_CURRENT_4_5UA 0x2
> +#define CP_CURRENT_7_5UA 0x6
> +#define CP_CURRENT_6UA 0x9
> +#define CP_CURRENT_12UA 0xb
> +#define CP_CURRENT_SEL(val) ((val) & 0xf)
> +#define CP_PROGRAM_EN BIT(7)
> +
> +#define LPF_RESISTORS_15_5KOHM 0x1
> +#define LPF_RESISTORS_13KOHM 0x2
> +#define LPF_RESISTORS_11_5KOHM 0x4
> +#define LPF_RESISTORS_10_5KOHM 0x8
> +#define LPF_RESISTORS_8KOHM 0x10
> +#define LPF_PROGRAM_EN BIT(6)
> +#define LPF_RESISTORS_SEL(val) ((val) & 0x3f)
> +
> +#define HSFREQRANGE_SEL(val) (((val) & 0x3f) << 1)
> +
> +#define INPUT_DIVIDER(val) (((val) - 1) & 0x7f)
> +#define LOW_PROGRAM_EN 0
> +#define HIGH_PROGRAM_EN BIT(7)
> +#define LOOP_DIV_LOW_SEL(val) (((val) - 1) & 0x1f)
> +#define LOOP_DIV_HIGH_SEL(val) ((((val) - 1) >> 5) & 0xf)
> +#define PLL_LOOP_DIV_EN BIT(5)
> +#define PLL_INPUT_DIV_EN BIT(4)
> +
> +#define POWER_CONTROL BIT(6)
> +#define INTERNAL_REG_CURRENT BIT(3)
> +#define BIAS_BLOCK_ON BIT(2)
> +#define BANDGAP_ON BIT(0)
> +
> +#define TER_RESISTOR_HIGH BIT(7)
> +#define TER_RESISTOR_LOW 0
> +#define LEVEL_SHIFTERS_ON BIT(6)
> +#define TER_CAL_DONE BIT(5)
> +#define SETRD_MAX (0x7 << 2)
> +#define POWER_MANAGE BIT(1)
> +#define TER_RESISTORS_ON BIT(0)
> +
> +#define BIASEXTR_SEL(val) ((val) & 0x7)
> +#define BANDGAP_SEL(val) ((val) & 0x7)
> +#define TLP_PROGRAM_EN BIT(7)
> +#define THS_PRE_PROGRAM_EN BIT(7)
> +#define THS_ZERO_PROGRAM_EN BIT(6)
> +
> +#define PLL_BIAS_CUR_SEL_CAP_VCO_CONTROL 0x10
> +#define PLL_CP_CONTROL_PLL_LOCK_BYPASS 0x11
> +#define PLL_LPF_AND_CP_CONTROL 0x12
> +#define PLL_INPUT_DIVIDER_RATIO 0x17
> +#define PLL_LOOP_DIVIDER_RATIO 0x18
> +#define PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL 0x19
> +#define BANDGAP_AND_BIAS_CONTROL 0x20
> +#define TERMINATION_RESISTER_CONTROL 0x21
> +#define AFE_BIAS_BANDGAP_ANALOG_PROGRAMMABILITY 0x22
> +#define HS_RX_CONTROL_OF_LANE_0 0x44
> +#define HS_TX_CLOCK_LANE_REQUEST_STATE_TIME_CONTROL 0x60
> +#define HS_TX_CLOCK_LANE_PREPARE_STATE_TIME_CONTROL 0x61
> +#define HS_TX_CLOCK_LANE_HS_ZERO_STATE_TIME_CONTROL 0x62
> +#define HS_TX_CLOCK_LANE_TRAIL_STATE_TIME_CONTROL 0x63
> +#define HS_TX_CLOCK_LANE_EXIT_STATE_TIME_CONTROL 0x64
> +#define HS_TX_CLOCK_LANE_POST_TIME_CONTROL 0x65
> +#define HS_TX_DATA_LANE_REQUEST_STATE_TIME_CONTROL 0x70
> +#define HS_TX_DATA_LANE_PREPARE_STATE_TIME_CONTROL 0x71
> +#define HS_TX_DATA_LANE_HS_ZERO_STATE_TIME_CONTROL 0x72
> +#define HS_TX_DATA_LANE_TRAIL_STATE_TIME_CONTROL 0x73
> +#define HS_TX_DATA_LANE_EXIT_STATE_TIME_CONTROL 0x74
> +
> +#define DW_MIPI_NEEDS_PHY_CFG_CLK BIT(0)
> +#define DW_MIPI_NEEDS_GRF_CLK BIT(1)
> +
> +#define RK3288_GRF_SOC_CON6 0x025c
> +#define RK3288_DSI0_SEL_VOP_LIT BIT(6)
> +#define RK3288_DSI1_SEL_VOP_LIT BIT(9)
> +
> +#define RK3399_GRF_SOC_CON20 0x6250
> +#define RK3399_DSI0_SEL_VOP_LIT BIT(0)
> +#define RK3399_DSI1_SEL_VOP_LIT BIT(4)
> +
> +/* disable turnrequest, turndisable, forcetxstopmode, forcerxmode */
> +#define RK3399_GRF_SOC_CON22 0x6258
> +#define RK3399_GRF_DSI_MODE 0xffff0000
> +
> +#define to_dsi(nm) container_of(nm, struct dw_mipi_dsi_rockchip, nm)
> +
> +enum {
> + BANDGAP_97_07,
> + BANDGAP_98_05,
> + BANDGAP_99_02,
> + BANDGAP_100_00,
> + BANDGAP_93_17,
> + BANDGAP_94_15,
> + BANDGAP_95_12,
> + BANDGAP_96_10,
> +};
> +
> +enum {
> + BIASEXTR_87_1,
> + BIASEXTR_91_5,
> + BIASEXTR_95_9,
> + BIASEXTR_100,
> + BIASEXTR_105_94,
> + BIASEXTR_111_88,
> + BIASEXTR_118_8,
> + BIASEXTR_127_7,
> +};
> +
> +struct rockchip_dw_dsi_chip_data {
> + u32 dsi0_en_bit;
> + u32 dsi1_en_bit;
> + u32 grf_switch_reg;
> + u32 grf_dsi0_mode;
> + u32 grf_dsi0_mode_reg;
> + unsigned int flags;
> + unsigned int max_data_lanes;
> +};
> +
> +struct dw_mipi_dsi_rockchip {
> + struct device *dev;
> + struct drm_encoder encoder;
> + void __iomem *base;
> +
> + struct regmap *grf_regmap;
> + struct clk *pllref_clk;
> + struct clk *grf_clk;
> + struct clk *phy_cfg_clk;
> +
> + unsigned int lane_mbps; /* per lane */
> + u16 input_div;
> + u16 feedback_div;
> + u32 format;
> +
> + const struct rockchip_dw_dsi_chip_data *cdata;
> + struct dw_mipi_dsi_plat_data pdata;
> +};
> +
> +struct dphy_pll_parameter_map {
> + unsigned int max_mbps;
> + u8 hsfreqrange;
> + u8 icpctrl;
> + u8 lpfctrl;
> +};
> +
> +/* The table is based on 27MHz DPHY pll reference clock. */
> +static const struct dphy_pll_parameter_map dppa_map[] = {
> + { 89, 0x00, CP_CURRENT_3UA, LPF_RESISTORS_13KOHM},
> + { 99, 0x10, CP_CURRENT_3UA, LPF_RESISTORS_13KOHM},
> + { 109, 0x20, CP_CURRENT_3UA, LPF_RESISTORS_13KOHM},
> + { 129, 0x01, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM},
> + { 139, 0x11, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM},
> + { 149, 0x21, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM},
> + { 169, 0x02, CP_CURRENT_6UA, LPF_RESISTORS_13KOHM},
> + { 179, 0x12, CP_CURRENT_6UA, LPF_RESISTORS_13KOHM},
> + { 199, 0x22, CP_CURRENT_6UA, LPF_RESISTORS_13KOHM},
> + { 219, 0x03, CP_CURRENT_4_5UA, LPF_RESISTORS_13KOHM},
> + { 239, 0x13, CP_CURRENT_4_5UA, LPF_RESISTORS_13KOHM},
> + { 249, 0x23, CP_CURRENT_4_5UA, LPF_RESISTORS_13KOHM},
> + { 269, 0x04, CP_CURRENT_6UA, LPF_RESISTORS_11_5KOHM},
> + { 299, 0x14, CP_CURRENT_6UA, LPF_RESISTORS_11_5KOHM},
> + { 329, 0x05, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM},
> + { 359, 0x15, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM},
> + { 399, 0x25, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM},
> + { 449, 0x06, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM},
> + { 499, 0x16, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM},
> + { 549, 0x07, CP_CURRENT_7_5UA, LPF_RESISTORS_10_5KOHM},
> + { 599, 0x17, CP_CURRENT_7_5UA, LPF_RESISTORS_10_5KOHM},
> + { 649, 0x08, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM},
> + { 699, 0x18, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM},
> + { 749, 0x09, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM},
> + { 799, 0x19, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM},
> + { 849, 0x29, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM},
> + { 899, 0x39, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM},
> + { 949, 0x0a, CP_CURRENT_12UA, LPF_RESISTORS_8KOHM},
> + { 999, 0x1a, CP_CURRENT_12UA, LPF_RESISTORS_8KOHM},
> + {1049, 0x2a, CP_CURRENT_12UA, LPF_RESISTORS_8KOHM},
> + {1099, 0x3a, CP_CURRENT_12UA, LPF_RESISTORS_8KOHM},
> + {1149, 0x0b, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM},
> + {1199, 0x1b, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM},
> + {1249, 0x2b, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM},
> + {1299, 0x3b, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM},
> + {1349, 0x0c, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM},
> + {1399, 0x1c, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM},
> + {1449, 0x2c, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM},
> + {1500, 0x3c, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM}
> +};
> +
> +static int max_mbps_to_parameter(unsigned int max_mbps)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(dppa_map); i++)
> + if (dppa_map[i].max_mbps >= max_mbps)
> + return i;
> +
> + return -EINVAL;
> +}
> +
> +static inline void dsi_write(struct dw_mipi_dsi_rockchip *dsi, u32 reg, u32 val)
> +{
> + writel(val, dsi->base + reg);
> +}
> +
> +static inline u32 dsi_read(struct dw_mipi_dsi_rockchip *dsi, u32 reg)
> +{
> + return readl(dsi->base + reg);
> +}
> +
> +static inline void dsi_set(struct dw_mipi_dsi_rockchip *dsi, u32 reg, u32 mask)
> +{
> + dsi_write(dsi, reg, dsi_read(dsi, reg) | mask);
> +}
> +
> +static inline void dsi_update_bits(struct dw_mipi_dsi_rockchip *dsi, u32 reg,
> + u32 mask, u32 val)
> +{
> + dsi_write(dsi, reg, (dsi_read(dsi, reg) & ~mask) | val);
> +}
> +
> +static void dw_mipi_dsi_phy_write(struct dw_mipi_dsi_rockchip *dsi,
> + u8 test_code,
> + u8 test_data)
> +{
> + /*
> + * With the falling edge on TESTCLK, the TESTDIN[7:0] signal content
> + * is latched internally as the current test code. Test data is
> + * programmed internally by rising edge on TESTCLK.
> + */
> + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
> +
> + dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_TESTEN | PHY_TESTDOUT(0) |
> + PHY_TESTDIN(test_code));
> +
> + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
> +
> + dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_UNTESTEN | PHY_TESTDOUT(0) |
> + PHY_TESTDIN(test_data));
> +
> + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
> +}
> +
> +/**
> + * ns2bc - Nanoseconds to byte clock cycles
> + */
> +static inline unsigned int ns2bc(struct dw_mipi_dsi_rockchip *dsi, int ns)
> +{
> + return DIV_ROUND_UP(ns * dsi->lane_mbps / 8, 1000);
> +}
> +
> +/**
> + * ns2ui - Nanoseconds to UI time periods
> + */
> +static inline unsigned int ns2ui(struct dw_mipi_dsi_rockchip *dsi, int ns)
> +{
> + return DIV_ROUND_UP(ns * dsi->lane_mbps, 1000);
> +}
> +
> +static int dw_mipi_dsi_phy_init(void *priv_data)
> +{
> + struct dw_mipi_dsi_rockchip *dsi = priv_data;
> + int ret, i, vco;
> +
> + vco = (dsi->lane_mbps < 200) ? 0 : (dsi->lane_mbps + 100) / 200;
> +
> + i = max_mbps_to_parameter(dsi->lane_mbps);
> + if (i < 0) {
> + DRM_DEV_ERROR(dsi->dev,
> + "failed to get parameter for %dmbps clock\n",
> + dsi->lane_mbps);
> + return i;
> + }
> +
> + ret = clk_prepare_enable(dsi->phy_cfg_clk);
> + if (ret) {
> + DRM_DEV_ERROR(dsi->dev, "Failed to enable phy_cfg_clk\n");
> + return ret;
> + }
> +
> + dw_mipi_dsi_phy_write(dsi, PLL_BIAS_CUR_SEL_CAP_VCO_CONTROL,
> + BYPASS_VCO_RANGE |
> + VCO_RANGE_CON_SEL(vco) |
> + VCO_IN_CAP_CON_LOW |
> + REF_BIAS_CUR_SEL);
> +
> + dw_mipi_dsi_phy_write(dsi, PLL_CP_CONTROL_PLL_LOCK_BYPASS,
> + CP_CURRENT_SEL(dppa_map[i].icpctrl));
> + dw_mipi_dsi_phy_write(dsi, PLL_LPF_AND_CP_CONTROL,
> + CP_PROGRAM_EN | LPF_PROGRAM_EN |
> + LPF_RESISTORS_SEL(dppa_map[i].lpfctrl));
> +
> + dw_mipi_dsi_phy_write(dsi, HS_RX_CONTROL_OF_LANE_0,
> + HSFREQRANGE_SEL(dppa_map[i].hsfreqrange));
> +
> + dw_mipi_dsi_phy_write(dsi, PLL_INPUT_DIVIDER_RATIO,
> + INPUT_DIVIDER(dsi->input_div));
> + dw_mipi_dsi_phy_write(dsi, PLL_LOOP_DIVIDER_RATIO,
> + LOOP_DIV_LOW_SEL(dsi->feedback_div) |
> + LOW_PROGRAM_EN);
> + /*
> + * We need set PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL immediately
> + * to make the configrued LSB effective according to IP simulation

"configured"

> + * and lab test results.
> + * Only in this way can we get correct mipi phy pll frequency.
> + */
> + dw_mipi_dsi_phy_write(dsi, PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL,
> + PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
> + dw_mipi_dsi_phy_write(dsi, PLL_LOOP_DIVIDER_RATIO,
> + LOOP_DIV_HIGH_SEL(dsi->feedback_div) |
> + HIGH_PROGRAM_EN);
> + dw_mipi_dsi_phy_write(dsi, PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL,
> + PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
> +
> + dw_mipi_dsi_phy_write(dsi, AFE_BIAS_BANDGAP_ANALOG_PROGRAMMABILITY,
> + LOW_PROGRAM_EN | BIASEXTR_SEL(BIASEXTR_127_7));
> + dw_mipi_dsi_phy_write(dsi, AFE_BIAS_BANDGAP_ANALOG_PROGRAMMABILITY,
> + HIGH_PROGRAM_EN | BANDGAP_SEL(BANDGAP_96_10));
> +
> + dw_mipi_dsi_phy_write(dsi, BANDGAP_AND_BIAS_CONTROL,
> + POWER_CONTROL | INTERNAL_REG_CURRENT |
> + BIAS_BLOCK_ON | BANDGAP_ON);
> +
> + dw_mipi_dsi_phy_write(dsi, TERMINATION_RESISTER_CONTROL,
> + TER_RESISTOR_LOW | TER_CAL_DONE |
> + SETRD_MAX | TER_RESISTORS_ON);
> + dw_mipi_dsi_phy_write(dsi, TERMINATION_RESISTER_CONTROL,
> + TER_RESISTOR_HIGH | LEVEL_SHIFTERS_ON |
> + SETRD_MAX | POWER_MANAGE |
> + TER_RESISTORS_ON);
> +
> + dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_REQUEST_STATE_TIME_CONTROL,
> + TLP_PROGRAM_EN | ns2bc(dsi, 500));
> + dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_PREPARE_STATE_TIME_CONTROL,
> + THS_PRE_PROGRAM_EN | ns2ui(dsi, 40));
> + dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_HS_ZERO_STATE_TIME_CONTROL,
> + THS_ZERO_PROGRAM_EN | ns2bc(dsi, 300));
> + dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_TRAIL_STATE_TIME_CONTROL,
> + THS_PRE_PROGRAM_EN | ns2ui(dsi, 100));
> + dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_EXIT_STATE_TIME_CONTROL,
> + BIT(5) | ns2bc(dsi, 100));
> + dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_POST_TIME_CONTROL,
> + BIT(5) | (ns2bc(dsi, 60) + 7));
> +
> + dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_REQUEST_STATE_TIME_CONTROL,
> + TLP_PROGRAM_EN | ns2bc(dsi, 500));
> + dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_PREPARE_STATE_TIME_CONTROL,
> + THS_PRE_PROGRAM_EN | (ns2ui(dsi, 50) + 20));
> + dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_HS_ZERO_STATE_TIME_CONTROL,
> + THS_ZERO_PROGRAM_EN | (ns2bc(dsi, 140) + 2));
> + dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_TRAIL_STATE_TIME_CONTROL,
> + THS_PRE_PROGRAM_EN | (ns2ui(dsi, 60) + 8));
> + dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_EXIT_STATE_TIME_CONTROL,
> + BIT(5) | ns2bc(dsi, 100));
> +
> + clk_disable_unprepare(dsi->phy_cfg_clk);
> +
> + return ret;
> +}
> +
> +static int
> +dw_mipi_dsi_get_lane_mbps(void *priv_data, struct drm_display_mode *mode,
> + unsigned long mode_flags, u32 lanes, u32 format,
> + unsigned int *lane_mbps)
> +{
> + struct dw_mipi_dsi_rockchip *dsi = priv_data;
> + int bpp;
> + unsigned long mpclk, tmp;
> + unsigned int target_mbps = 1000;
> + unsigned int max_mbps = dppa_map[ARRAY_SIZE(dppa_map) - 1].max_mbps;
> + unsigned long best_freq = 0;
> + unsigned long fvco_min, fvco_max, fin, fout;
> + unsigned int min_prediv, max_prediv;
> + unsigned int _prediv, uninitialized_var(best_prediv);
> + unsigned long _fbdiv, uninitialized_var(best_fbdiv);
> + unsigned long min_delta = ULONG_MAX;
> +
> + dsi->format = format;
> + bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
> + if (bpp < 0) {
> + DRM_DEV_ERROR(dsi->dev,
> + "failed to get bpp for pixel format %d\n",
> + dsi->format);
> + return bpp;
> + }
> +
> + mpclk = DIV_ROUND_UP(mode->clock, MSEC_PER_SEC);
> + if (mpclk) {
> + /* take 1 / 0.8, since mbps must big than bandwidth of RGB */
> + tmp = mpclk * (bpp / lanes) * 10 / 8;
> + if (tmp < max_mbps)
> + target_mbps = tmp;
> + else
> + DRM_DEV_ERROR(dsi->dev,
> + "DPHY clock frequency is out of range\n");
> + }
> +
> + fin = clk_get_rate(dsi->pllref_clk);
> + fout = target_mbps * USEC_PER_SEC;
> +
> + /* constraint: 5Mhz <= Fref / N <= 40MHz */
> + min_prediv = DIV_ROUND_UP(fin, 40 * USEC_PER_SEC);
> + max_prediv = fin / (5 * USEC_PER_SEC);
> +
> + /* constraint: 80MHz <= Fvco <= 1500Mhz */
> + fvco_min = 80 * USEC_PER_SEC;
> + fvco_max = 1500 * USEC_PER_SEC;
> +
> + for (_prediv = min_prediv; _prediv <= max_prediv; _prediv++) {
> + u64 tmp;
> + u32 delta;
> + /* Fvco = Fref * M / N */
> + tmp = (u64)fout * _prediv;
> + do_div(tmp, fin);
> + _fbdiv = tmp;
> + /*
> + * Due to the use of a "by 2 pre-scaler," the range of the
> + * feedback multiplication value M is limited to even division
> + * numbers, and m must be greater than 6, less than 512.
> + */
> + if (_fbdiv < 6 || _fbdiv > 512)
> + continue;
> +
> + _fbdiv += _fbdiv % 2;
> +
> + tmp = (u64)_fbdiv * fin;
> + do_div(tmp, _prediv);
> + if (tmp < fvco_min || tmp > fvco_max)
> + continue;
> +
> + delta = abs(fout - tmp);
> + if (delta < min_delta) {
> + best_prediv = _prediv;
> + best_fbdiv = _fbdiv;
> + min_delta = delta;
> + best_freq = tmp;
> + }
> + }
> + if (best_freq) {
> + dsi->lane_mbps = DIV_ROUND_UP(best_freq, USEC_PER_SEC);
> + *lane_mbps = dsi->lane_mbps;
> + dsi->input_div = best_prediv;
> + dsi->feedback_div = best_fbdiv;
> + } else
> + DRM_DEV_ERROR(dsi->dev, "Can not find best_freq for DPHY\n");

Return an error? Also, use braces on the 'else' if you had to use them
on the 'if'.

> +
> + return 0;
> +}
> +
> +static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_rockchip_phy_ops = {
> + .init = dw_mipi_dsi_phy_init,
> + .get_lane_mbps = dw_mipi_dsi_get_lane_mbps,
> +};
> +
> +static struct rockchip_dw_dsi_chip_data rk3288_chip_data = {
> + .dsi0_en_bit = RK3288_DSI0_SEL_VOP_LIT,
> + .dsi1_en_bit = RK3288_DSI1_SEL_VOP_LIT,
> + .grf_switch_reg = RK3288_GRF_SOC_CON6,
> + .max_data_lanes = 4,
> +};
> +
> +static struct rockchip_dw_dsi_chip_data rk3399_chip_data = {
> + .dsi0_en_bit = RK3399_DSI0_SEL_VOP_LIT,
> + .dsi1_en_bit = RK3399_DSI1_SEL_VOP_LIT,
> + .grf_switch_reg = RK3399_GRF_SOC_CON20,
> + .grf_dsi0_mode = RK3399_GRF_DSI_MODE,
> + .grf_dsi0_mode_reg = RK3399_GRF_SOC_CON22,
> + .flags = DW_MIPI_NEEDS_PHY_CFG_CLK | DW_MIPI_NEEDS_GRF_CLK,
> + .max_data_lanes = 4,
> +};
> +
> +static const struct of_device_id dw_mipi_dsi_rockchip_dt_ids[] = {
> + {
> + .compatible = "rockchip,rk3288-mipi-dsi",
> + .data = &rk3288_chip_data,
> + }, {
> + .compatible = "rockchip,rk3399-mipi-dsi",
> + .data = &rk3399_chip_data,
> + },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, dw_mipi_dsi_rockchip_dt_ids);
> +
> +static void dw_mipi_dsi_encoder_nop(struct drm_encoder *encoder)
> +{
> + /* do nothing */
> +}

As of this:
75229eca569f drm: Make drm_encoder_helper_funcs optional
these "nop" functions are actually optional. You can just completely
remove the .enable/.disable callbacks in this driver.

> +
> +static void dw_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adjusted)
> +{
> + struct dw_mipi_dsi_rockchip *dsi = to_dsi(encoder);
> + const struct rockchip_dw_dsi_chip_data *cdata = dsi->cdata;
> + int val, ret;
> +
> + /*
> + * For the RK3399, the clk of grf must be enabled before writing grf
> + * register. And for RK3288 or other soc, this grf_clk must be NULL,
> + * the clk_prepare_enable return true directly.
> + */
> + ret = clk_prepare_enable(dsi->grf_clk);
> + if (ret) {
> + DRM_DEV_ERROR(dsi->dev, "Failed to enable grf_clk: %d\n", ret);
> + return;
> + }
> +
> + ret = drm_of_encoder_active_endpoint_id(dsi->dev->of_node,
> + &dsi->encoder);
> + if (ret < 0)
> + return;

On failure here, you need to disable the GRF clock. Or, you could move
drm_of_encoder_active_endpoint_id() before
clk_prepare_enable(dsi->grf_clk).

> +
> + val = cdata->dsi0_en_bit << 16;
> + if (ret)
> + val |= cdata->dsi0_en_bit;
> + regmap_write(dsi->grf_regmap, cdata->grf_switch_reg, val);
> +
> + if (cdata->grf_dsi0_mode_reg)
> + regmap_write(dsi->grf_regmap, cdata->grf_dsi0_mode_reg,
> + cdata->grf_dsi0_mode);
> +
> + clk_disable_unprepare(dsi->grf_clk);
> +}
> +
> +static int
> +dw_mipi_dsi_encoder_atomic_check(struct drm_encoder *encoder,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
> + struct dw_mipi_dsi_rockchip *dsi = to_dsi(encoder);
> +
> + switch (dsi->format) {
> + case MIPI_DSI_FMT_RGB888:
> + s->output_mode = ROCKCHIP_OUT_MODE_P888;
> + break;
> + case MIPI_DSI_FMT_RGB666:
> + s->output_mode = ROCKCHIP_OUT_MODE_P666;
> + break;
> + case MIPI_DSI_FMT_RGB565:
> + s->output_mode = ROCKCHIP_OUT_MODE_P565;
> + break;
> + default:
> + WARN_ON(1);
> + return -EINVAL;
> + }
> +
> + s->output_type = DRM_MODE_CONNECTOR_DSI;
> +
> + return 0;
> +}
> +
> +static const struct drm_encoder_helper_funcs
> +dw_mipi_dsi_encoder_helper_funcs = {
> + .enable = dw_mipi_dsi_encoder_nop,
> + .disable = dw_mipi_dsi_encoder_nop,
> + .mode_set = dw_mipi_dsi_encoder_mode_set,
> + .atomic_check = dw_mipi_dsi_encoder_atomic_check,
> +};
> +
> +static const struct drm_encoder_funcs dw_mipi_dsi_encoder_funcs = {
> + .destroy = drm_encoder_cleanup,
> +};
> +
> +static int rockchip_dsi_drm_create_encoder(struct dw_mipi_dsi_rockchip *dsi,
> + struct drm_device *drm_dev)
> +{
> + struct drm_encoder *encoder = &dsi->encoder;
> + int ret;
> +
> + encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
> + dsi->dev->of_node);
> +
> + ret = drm_encoder_init(drm_dev, encoder, &dw_mipi_dsi_encoder_funcs,
> + DRM_MODE_ENCODER_DSI, NULL);
> + if (ret) {
> + DRM_ERROR("Failed to initialize encoder with drm\n");
> + return ret;
> + }
> +
> + drm_encoder_helper_add(encoder, &dw_mipi_dsi_encoder_helper_funcs);
> +
> + return 0;
> +}
> +
> +static int dw_mipi_dsi_rockchip_bind(struct device *dev,
> + struct device *master,
> + void *data)
> +{
> + const struct of_device_id *of_id =
> + of_match_device(dw_mipi_dsi_rockchip_dt_ids, dev);
> + const struct rockchip_dw_dsi_chip_data *cdata = of_id->data;
> + struct dw_mipi_dsi_rockchip *dsi = dev_get_drvdata(dev);

Hmm, I see a "get_drvdata()" but no "set_drvdata()" in this driver.
Also, the bridge driver is fighting you on this one. You'll need my
patch [1] for this to make sense.

[1] https://patchwork.kernel.org/patch/10078493/

> + struct resource *res;
> + struct platform_device *pdev = to_platform_device(dev);
> + struct drm_device *drm_dev = data;
> + struct device_node *np = dev->of_node;
> + int ret;
> +
> + dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
> + if (!dsi)
> + return -ENOMEM;
> +
> + dsi->cdata = cdata;
> + dsi->dev = dev;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + DRM_ERROR("Unable to get resource\n");
> + return -ENODEV;
> + }
> +
> + dsi->base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(dsi->base)) {
> + DRM_ERROR("Unable to get dsi registers\n");
> + return PTR_ERR(dsi->base);
> + }
> +
> + dsi->pllref_clk = devm_clk_get(dev, "ref");
> + if (IS_ERR(dsi->pllref_clk)) {
> + ret = PTR_ERR(dsi->pllref_clk);
> + DRM_DEV_ERROR(dev,
> + "Unable to get pll reference clock: %d\n", ret);
> + return ret;
> + }
> +
> + if (cdata->flags & DW_MIPI_NEEDS_PHY_CFG_CLK) {
> + dsi->phy_cfg_clk = devm_clk_get(dev, "phy_cfg");
> + if (IS_ERR(dsi->phy_cfg_clk)) {
> + ret = PTR_ERR(dsi->phy_cfg_clk);
> + DRM_DEV_ERROR(dev,
> + "Unable to get phy_cfg_clk: %d\n", ret);
> + return ret;
> + }
> + }
> +
> + if (cdata->flags & DW_MIPI_NEEDS_GRF_CLK) {
> + dsi->grf_clk = devm_clk_get(dev, "grf");
> + if (IS_ERR(dsi->grf_clk)) {
> + ret = PTR_ERR(dsi->grf_clk);
> + DRM_DEV_ERROR(dev, "Unable to get grf_clk: %d\n", ret);
> + return ret;
> + }
> + }
> +
> + ret = clk_prepare_enable(dsi->pllref_clk);
> + if (ret) {
> + DRM_DEV_ERROR(dev,
> + "%s: Failed to enable pllref_clk\n", __func__);
> + return ret;
> + }
> +
> + dsi->grf_regmap = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
> + if (IS_ERR(dsi->grf_regmap)) {
> + DRM_DEV_ERROR(dsi->dev, "Unable to get rockchip,grf\n");
> + return PTR_ERR(dsi->grf_regmap);
> + }
> +
> + dsi->pdata.base = dsi->base;
> + dsi->pdata.priv_data = dsi;
> + dsi->pdata.max_data_lanes = cdata->max_data_lanes;
> + dsi->pdata.phy_ops = &dw_mipi_dsi_rockchip_phy_ops;
> +
> + ret = rockchip_dsi_drm_create_encoder(dsi, drm_dev);
> + if (ret) {
> + DRM_ERROR("Failed to create drm encoder\n");
> + return ret;
> + }
> + ret = dw_mipi_dsi_bind(pdev, &dsi->encoder, &dsi->pdata);
> + if (ret) {
> + DRM_ERROR("Failed to bind\n");
> + clk_disable_unprepare(dsi->pllref_clk);
> + return ret;
> + }
> + return 0;
> +}
> +
> +static void dw_mipi_dsi_rockchip_unbind(struct device *dev,
> + struct device *master,
> + void *data)
> +{

Are you going to undo anything here? e.g., dw_mipi_dsi_unbind() and
clk_disable_unprepare(dsi->pllref_clk)?

Brian

> +}
> +
> +static const struct component_ops dw_mipi_dsi_rockchip_ops = {
> + .bind = dw_mipi_dsi_rockchip_bind,
> + .unbind = dw_mipi_dsi_rockchip_unbind,
> +};
> +
> +static int dw_mipi_dsi_rockchip_probe(struct platform_device *pdev)
> +{
> + return component_add(&pdev->dev, &dw_mipi_dsi_rockchip_ops);
> +}
> +
> +static int dw_mipi_dsi_rockchip_remove(struct platform_device *pdev)
> +{
> + component_del(&pdev->dev, &dw_mipi_dsi_rockchip_ops);
> +
> + return 0;
> +}
> +
> +struct platform_driver dw_mipi_dsi_rockchip_driver = {
> + .probe = dw_mipi_dsi_rockchip_probe,
> + .remove = dw_mipi_dsi_rockchip_remove,
> + .driver = {
> + .of_match_table = dw_mipi_dsi_rockchip_dt_ids,
> + .name = "dw-mipi-dsi-rockchip",
> + },
> +};
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index 76d63de..d40cc39 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -462,7 +462,7 @@ static int __init rockchip_drm_init(void)
> ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
> ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
> CONFIG_ROCKCHIP_DW_HDMI);
> - ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_driver,
> + ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
> CONFIG_ROCKCHIP_DW_MIPI_DSI);
> ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> index 498dfbc..af235b2 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> @@ -66,7 +66,7 @@ void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
>
> extern struct platform_driver cdn_dp_driver;
> extern struct platform_driver dw_hdmi_rockchip_pltfm_driver;
> -extern struct platform_driver dw_mipi_dsi_driver;
> +extern struct platform_driver dw_mipi_dsi_rockchip_driver;
> extern struct platform_driver inno_hdmi_driver;
> extern struct platform_driver rockchip_dp_driver;
> extern struct platform_driver rockchip_lvds_driver;
> --
> 1.9.1
>

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