Hi Thierry,
A big thank you for your code review and comments.
It helped me to improve the driver and to send a v2.
Philippe :-)
On 02/28/2018 08:16 PM, Thierry Reding wrote:
> On Thu, Feb 08, 2018 at 03:30:26PM +0100, Philippe Cornu wrote:
>> This patch adds Raydium Semiconductor Corporation rm68200
>> 5.5" 720x1280 TFT LCD panel driver (MIPI-DSI video mode).
>>
>> Signed-off-by: Philippe Cornu <philippe.co...@st.com>
>> ---
>> drivers/gpu/drm/panel/Kconfig | 8 +
>> drivers/gpu/drm/panel/Makefile | 1 +
>> drivers/gpu/drm/panel/panel-raydium-rm68200.c | 464
>> ++++++++++++++++++++++++++
>> 3 files changed, 473 insertions(+)
>> create mode 100755 drivers/gpu/drm/panel/panel-raydium-rm68200.c
>>
>> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
>> index 988048ebcc22..08d99dd46765 100644
>> --- a/drivers/gpu/drm/panel/Kconfig
>> +++ b/drivers/gpu/drm/panel/Kconfig
>> @@ -108,6 +108,14 @@ config DRM_PANEL_RASPBERRYPI_TOUCHSCREEN
>> Pi 7" Touchscreen. To compile this driver as a module,
>> choose M here.
>>
>> +config DRM_PANEL_RAYDIUM_RM68200
>> + tristate "Raydium rm68200 720x1280 dsi 2dl video mode panel"
>
> What's 2dl? Either this is something already implied by the RM68200
> model or if there are multiple variants of the RM68200 you'll probably
> want to ensure that's reflected in the compatible string.
>
>> + depends on OF
>> + depends on DRM_MIPI_DSI
>> + help
>> + Say Y here if you want to enable support for Raydium rm68200
>> + 720x1280 dsi 2dl video mode panel
>> +
>> config DRM_PANEL_SAMSUNG_S6E3HA2
>> tristate "Samsung S6E3HA2 DSI video mode panel"
>> depends on OF
>> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
>> index 3d2a88d0e965..f26efc11d746 100644
>> --- a/drivers/gpu/drm/panel/Makefile
>> +++ b/drivers/gpu/drm/panel/Makefile
>> @@ -9,6 +9,7 @@ obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
>> obj-$(CONFIG_DRM_PANEL_ORISETECH_OTM8009A) += panel-orisetech-otm8009a.o
>> obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) +=
>> panel-panasonic-vvx10f034n00.o
>> obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) +=
>> panel-raspberrypi-touchscreen.o
>> +obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
>> obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
>> obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
>> obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
>> diff --git a/drivers/gpu/drm/panel/panel-raydium-rm68200.c
>> b/drivers/gpu/drm/panel/panel-raydium-rm68200.c
>> new file mode 100755
>> index 000000000000..f3e15873d05a
>> --- /dev/null
>> +++ b/drivers/gpu/drm/panel/panel-raydium-rm68200.c
>> @@ -0,0 +1,464 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) STMicroelectronics SA 2017
>> + *
>> + * Authors: Philippe Cornu <philippe.co...@st.com>
>> + * Yannick Fertre <yannick.fer...@st.com>
>> + */
>> +
>> +#include <drm/drmP.h>
>> +#include <drm/drm_mipi_dsi.h>
>> +#include <drm/drm_panel.h>
>> +#include <linux/backlight.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <video/mipi_display.h>
>> +
>> +#define DRV_NAME "raydium_rm68200"
>
> Not needed, see below.
>
>> +
>> +/*** Manufacturer Command Set ***/
>> +#define MCS_CMD_MODE_SW 0xFE /* CMD Mode Switch */
>> +#define MCS_CMD1_UCS 0x00 /* User Command Set (UCS = CMD1) */
>> +#define MCS_CMD2_P0 0x01 /* Manufacture Command Set Page0 (CMD2 P0) */
>> +#define MCS_CMD2_P1 0x02 /* Manufacture Command Set Page1 (CMD2 P1) */
>> +#define MCS_CMD2_P2 0x03 /* Manufacture Command Set Page2 (CMD2 P2) */
>> +#define MCS_CMD2_P3 0x04 /* Manufacture Command Set Page3 (CMD2 P3) */
>> +
>> +/* CMD2 P0 commands (Display Options and Power) */
>> +#define MCS_STBCTR 0x12 /* TE1 Output Setting Zig-Zag Connection */
>> +#define MCS_SGOPCTR 0x16 /* Source Bias Current */
>> +#define MCS_SDCTR 0x1A /* Source Output Delay Time */
>> +#define MCS_INVCTR 0x1B /* Inversion Type */
>> +#define MCS_EXT_PWR_IC 0x24 /* External PWR IC Control */
>> +#define MCS_SETAVDD 0x27 /* PFM Control for AVDD Output */
>> +#define MCS_SETAVEE 0x29 /* PFM Control for AVEE Output */
>> +#define MCS_BT2CTR 0x2B /* DDVDL Charge Pump Control */
>> +#define MCS_BT3CTR 0x2F /* VGH Charge Pump Control */
>> +#define MCS_BT4CTR 0x34 /* VGL Charge Pump Control */
>> +#define MCS_VCMCTR 0x46 /* VCOM Output Level Control */
>> +#define MCS_SETVGN 0x52 /* VG M/S N Control */
>> +#define MCS_SETVGP 0x54 /* VG M/S P Control */
>> +#define MCS_SW_CTRL 0x5F /* Interface Control for PFM and MIPI */
>> +
>> +/* CMD2 P2 commands (GOA Timing Control) - no description in datasheet */
>> +#define GOA_VSTV1 0x00
>> +#define GOA_VSTV2 0x07
>> +#define GOA_VCLK1 0x0E
>> +#define GOA_VCLK2 0x17
>> +#define GOA_VCLK_OPT1 0x20
>> +#define GOA_BICLK1 0x2A
>> +#define GOA_BICLK2 0x37
>> +#define GOA_BICLK3 0x44
>> +#define GOA_BICLK4 0x4F
>> +#define GOA_BICLK_OPT1 0x5B
>> +#define GOA_BICLK_OPT2 0x60
>> +#define MCS_GOA_GPO1 0x6D
>> +#define MCS_GOA_GPO2 0x71
>> +#define MCS_GOA_EQ 0x74
>> +#define MCS_GOA_CLK_GALLON 0x7C
>> +#define MCS_GOA_FS_SEL0 0x7E
>> +#define MCS_GOA_FS_SEL1 0x87
>> +#define MCS_GOA_FS_SEL2 0x91
>> +#define MCS_GOA_FS_SEL3 0x9B
>> +#define MCS_GOA_BS_SEL0 0xAC
>> +#define MCS_GOA_BS_SEL1 0xB5
>> +#define MCS_GOA_BS_SEL2 0xBF
>> +#define MCS_GOA_BS_SEL3 0xC9
>> +#define MCS_GOA_BS_SEL4 0xD3
>> +
>> +/* CMD2 P3 commands (Gamma) */
>> +#define MCS_GAMMA_VP 0x60 /* Gamma VP1~VP16 */
>> +#define MCS_GAMMA_VN 0x70 /* Gamma VN1~VN16 */
>> +
>> +struct rm68200 {
>> + struct device *dev;
>> + struct drm_panel panel;
>> + struct gpio_desc *reset_gpio;
>> + struct regulator *supply;
>> + struct backlight_device *bl_dev;
>> + bool prepared;
>> + bool enabled;
>> +};
>> +
>> +static const struct drm_display_mode default_mode = {
>> + .clock = 52582,
>> + .hdisplay = 720,
>> + .hsync_start = 720 + 38,
>> + .hsync_end = 720 + 38 + 8,
>> + .htotal = 720 + 38 + 8 + 38,
>> + .vdisplay = 1280,
>> + .vsync_start = 1280 + 12,
>> + .vsync_end = 1280 + 12 + 4,
>> + .vtotal = 1280 + 12 + 4 + 12,
>> + .vrefresh = 50,
>> + .flags = 0,
>> + .width_mm = 68,
>> + .height_mm = 122,
>> +};
>> +
>> +static inline struct rm68200 *panel_to_rm68200(struct drm_panel *panel)
>> +{
>> + return container_of(panel, struct rm68200, panel);
>> +}
>> +
>> +static void rm68200_dcs_write_buf(struct rm68200 *ctx, const void *data,
>> + size_t len)
>> +{
>> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>> +
>> + if (mipi_dsi_dcs_write_buffer(dsi, data, len) < 0)
>> + DRM_WARN("mipi dsi dcs write buffer failed\n");
>> +}
>> +
>> +static void rm68200_dcs_write_cmd(struct rm68200 *ctx, u8 cmd, u8 value)
>> +{
>> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>> +
>> + if (mipi_dsi_dcs_write(dsi, cmd, &value, 1) < 0)
>> + DRM_WARN("mipi dsi dcs write failed\n");
>> +}
>
> I question the usefulness of your error reporting here. You're not
> giving the user any meaningful feedback. Also, you'll be warning about
> every single failure. It's likely that if one of the writes fails, then
> subsequent writes will also fail, which means that you'll give the user
> a flood of DRM_WARN() with exactly the same text.
>
>> +/*
>> + * This panel is not able to auto-increment all cmd addresses so for some of
>> + * them, we need to send them one by one...
>> + */
>> +#define dcs_write_cmd_seq(ctx, cmd, seq...) \
>> +({ \
>> + static const u8 d[] = { seq }; \
>> + static int i; \
>> + for (i = 0; i < ARRAY_SIZE(d) ; i++) \
>> + rm68200_dcs_write_cmd(ctx, cmd + i, d[i]); \
>> +})
>> +
>> +static void rm68200_init_sequence(struct rm68200 *ctx)
>> +{
>> + /* Enter CMD2 with page 0 */
>> + dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD2_P0);
>> + dcs_write_cmd_seq(ctx, MCS_EXT_PWR_IC, 0xC0, 0x53, 0x00);
>> + dcs_write_seq(ctx, MCS_BT2CTR, 0xE5);
>> + dcs_write_seq(ctx, MCS_SETAVDD, 0x0A);
>> + dcs_write_seq(ctx, MCS_SETAVEE, 0x0A);
>> + dcs_write_seq(ctx, MCS_SGOPCTR, 0x52);
>> + dcs_write_seq(ctx, MCS_BT3CTR, 0x53);
>> + dcs_write_seq(ctx, MCS_BT4CTR, 0x5A);
>> + dcs_write_seq(ctx, MCS_INVCTR, 0x00);
>> + dcs_write_seq(ctx, MCS_STBCTR, 0x0A);
>> + dcs_write_seq(ctx, MCS_SDCTR, 0x06);
>> + dcs_write_seq(ctx, MCS_VCMCTR, 0x56);
>> + dcs_write_seq(ctx, MCS_SETVGN, 0xA0, 0x00);
>> + dcs_write_seq(ctx, MCS_SETVGP, 0xA0, 0x00);
>> + dcs_write_seq(ctx, MCS_SW_CTRL, 0x11); /* 2 data lanes, see doc */
>> +
>> + dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD2_P2);
>> + dcs_write_seq(ctx, GOA_VSTV1, 0x05);
>> + dcs_write_seq(ctx, 0x02, 0x0B);
>> + dcs_write_seq(ctx, 0x03, 0x0F);
>> + dcs_write_seq(ctx, 0x04, 0x7D, 0x00, 0x50);
>> + dcs_write_cmd_seq(ctx, GOA_VSTV2, 0x05, 0x16, 0x0D, 0x11, 0x7D, 0x00,
>> + 0x50);
>> + dcs_write_cmd_seq(ctx, GOA_VCLK1, 0x07, 0x08, 0x01, 0x02, 0x00, 0x7D,
>> + 0x00, 0x85, 0x08);
>> + dcs_write_cmd_seq(ctx, GOA_VCLK2, 0x03, 0x04, 0x05, 0x06, 0x00, 0x7D,
>> + 0x00, 0x85, 0x08);
>> + dcs_write_seq(ctx, GOA_VCLK_OPT1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> + 0x00, 0x00, 0x00, 0x00);
>> + dcs_write_cmd_seq(ctx, GOA_BICLK1, 0x07, 0x08);
>> + dcs_write_seq(ctx, 0x2D, 0x01);
>> + dcs_write_seq(ctx, 0x2F, 0x02, 0x00, 0x40, 0x05, 0x08, 0x54, 0x7D,
>> + 0x00);
>> + dcs_write_cmd_seq(ctx, GOA_BICLK2, 0x03, 0x04, 0x05, 0x06, 0x00);
>> + dcs_write_seq(ctx, 0x3D, 0x40);
>> + dcs_write_seq(ctx, 0x3F, 0x05, 0x08, 0x54, 0x7D, 0x00);
>> + dcs_write_seq(ctx, GOA_BICLK3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> + 0x00, 0x00, 0x00, 0x00, 0x00);
>> + dcs_write_seq(ctx, GOA_BICLK4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> + 0x00, 0x00);
>> + dcs_write_seq(ctx, 0x58, 0x00, 0x00, 0x00);
>> + dcs_write_seq(ctx, GOA_BICLK_OPT1, 0x00, 0x00, 0x00, 0x00, 0x00);
>> + dcs_write_seq(ctx, GOA_BICLK_OPT2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
>> + dcs_write_seq(ctx, MCS_GOA_GPO1, 0x00, 0x00, 0x00, 0x00);
>> + dcs_write_seq(ctx, MCS_GOA_GPO2, 0x00, 0x20, 0x00);
>> + dcs_write_seq(ctx, MCS_GOA_EQ, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
>> + 0x00, 0x00);
>> + dcs_write_seq(ctx, MCS_GOA_CLK_GALLON, 0x00, 0x00);
>> + dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL0, 0xBF, 0x02, 0x06, 0x14, 0x10,
>> + 0x16, 0x12, 0x08, 0x3F);
>> + dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL1, 0x3F, 0x3F, 0x3F, 0x3F, 0x0C,
>> + 0x0A, 0x0E, 0x3F, 0x3F, 0x00);
>> + dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL2, 0x04, 0x3F, 0x3F, 0x3F, 0x3F,
>> + 0x05, 0x01, 0x3F, 0x3F, 0x0F);
>> + dcs_write_cmd_seq(ctx, MCS_GOA_FS_SEL3, 0x0B, 0x0D, 0x3F, 0x3F, 0x3F,
>> + 0x3F);
>> + dcs_write_cmd_seq(ctx, 0xA2, 0x3F, 0x09, 0x13, 0x17, 0x11, 0x15);
>> + dcs_write_cmd_seq(ctx, 0xA9, 0x07, 0x03, 0x3F);
>> + dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL0, 0x3F, 0x05, 0x01, 0x17, 0x13,
>> + 0x15, 0x11, 0x0F, 0x3F);
>> + dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL1, 0x3F, 0x3F, 0x3F, 0x3F, 0x0B,
>> + 0x0D, 0x09, 0x3F, 0x3F, 0x07);
>> + dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL2, 0x03, 0x3F, 0x3F, 0x3F, 0x3F,
>> + 0x02, 0x06, 0x3F, 0x3F, 0x08);
>> + dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL3, 0x0C, 0x0A, 0x3F, 0x3F, 0x3F,
>> + 0x3F, 0x3F, 0x0E, 0x10, 0x14);
>> + dcs_write_cmd_seq(ctx, MCS_GOA_BS_SEL4, 0x12, 0x16, 0x00, 0x04, 0x3F);
>> + dcs_write_seq(ctx, 0xDC, 0x02);
>> + dcs_write_seq(ctx, 0xDE, 0x12);
>> +
>> + dcs_write_seq(ctx, MCS_CMD_MODE_SW, 0x0E); /* No documentation */
>> + dcs_write_seq(ctx, 0x01, 0x75);
>> +
>> + dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD2_P3);
>> + dcs_write_cmd_seq(ctx, MCS_GAMMA_VP, 0x00, 0x0C, 0x12, 0x0E, 0x06,
>> + 0x12, 0x0E, 0x0B, 0x15, 0x0B, 0x10, 0x07, 0x0F,
>> + 0x12, 0x0C, 0x00);
>> + dcs_write_cmd_seq(ctx, MCS_GAMMA_VN, 0x00, 0x0C, 0x12, 0x0E, 0x06,
>> + 0x12, 0x0E, 0x0B, 0x15, 0x0B, 0x10, 0x07, 0x0F,
>> + 0x12, 0x0C, 0x00);
>> +
>> + /* Exit CMD2 */
>> + dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD1_UCS);
>> +}
>> +
>> +static int rm68200_disable(struct drm_panel *panel)
>> +{
>> + struct rm68200 *ctx = panel_to_rm68200(panel);
>> +
>> + if (!ctx->enabled)
>> + return 0;
>> +
>> + if (ctx->bl_dev) {
>> + ctx->bl_dev->props.power = FB_BLANK_POWERDOWN;
>> + ctx->bl_dev->props.state |= BL_CORE_FBBLANK;
>> + backlight_update_status(ctx->bl_dev);
>> + }
>
> This should use the new backlight_disable() function.
>
>> +
>> + ctx->enabled = false;
>> +
>> + return 0;
>> +}
>> +
>> +static int rm68200_unprepare(struct drm_panel *panel)
>> +{
>> + struct rm68200 *ctx = panel_to_rm68200(panel);
>> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>> + int ret;
>> +
>> + if (!ctx->prepared)
>> + return 0;
>> +
>> + ret = mipi_dsi_dcs_set_display_off(dsi);
>> + if (ret)
>> + DRM_WARN("failed to set display off: %d\n", ret);
>> +
>> + ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
>> + if (ret)
>> + DRM_WARN("failed to enter sleep mode: %d\n", ret);
>> +
>> + msleep(120);
>> +
>> + if (ctx->reset_gpio) {
>> + gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> + msleep(20);
>> + }
>> +
>> + regulator_disable(ctx->supply);
>> +
>> + ctx->prepared = false;
>> +
>> + return 0;
>> +}
>> +
>> +static int rm68200_prepare(struct drm_panel *panel)
>> +{
>> + struct rm68200 *ctx = panel_to_rm68200(panel);
>> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>> + int ret;
>> +
>> + if (ctx->prepared)
>> + return 0;
>> +
>> + ret = regulator_enable(ctx->supply);
>> + if (ret < 0) {
>> + DRM_ERROR("failed to enable supply: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + if (ctx->reset_gpio) {
>> + gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>
> Why do you need this? If the panel is already in reset, shouldn't the
> below still work? Why take it out of reset only to reset it immediately
> afterwards again?
>
>> + gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> + msleep(20);
>> + gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>> + msleep(100);
>> + }
>> +
>> + rm68200_init_sequence(ctx);
>> +
>> + ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
>> + if (ret)
>> + return ret;
>> +
>> + msleep(125);
>> +
>> + ret = mipi_dsi_dcs_set_display_on(dsi);
>> + if (ret)
>> + return ret;
>> +
>> + msleep(20);
>> +
>> + ctx->prepared = true;
>> +
>> + return 0;
>> +}
>> +
>> +static int rm68200_enable(struct drm_panel *panel)
>> +{
>> + struct rm68200 *ctx = panel_to_rm68200(panel);
>> +
>> + if (ctx->enabled)
>> + return 0;
>> +
>> + if (ctx->bl_dev) {
>> + ctx->bl_dev->props.state &= ~BL_CORE_FBBLANK;
>> + ctx->bl_dev->props.power = FB_BLANK_UNBLANK;
>> + backlight_update_status(ctx->bl_dev);
>> + }
>
> backlight_enable(), please.
>
>> +
>> + ctx->enabled = true;
>> +
>> + return 0;
>> +}
>> +
>> +static int rm68200_get_modes(struct drm_panel *panel)
>> +{
>> + struct drm_display_mode *mode;
>> +
>> + mode = drm_mode_duplicate(panel->drm, &default_mode);
>> + if (!mode) {
>> + DRM_ERROR("failed to add mode %ux%ux@%u\n",
>> + default_mode.hdisplay, default_mode.vdisplay,
>> + default_mode.vrefresh);
>> + return -ENOMEM;
>> + }
>> +
>> + drm_mode_set_name(mode);
>> +
>> + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
>> + drm_mode_probed_add(panel->connector, mode);
>> +
>> + panel->connector->display_info.width_mm = mode->width_mm;
>> + panel->connector->display_info.height_mm = mode->height_mm;
>> +
>> + return 1;
>> +}
>> +
>> +static const struct drm_panel_funcs rm68200_drm_funcs = {
>> + .disable = rm68200_disable,
>> + .unprepare = rm68200_unprepare,
>> + .prepare = rm68200_prepare,
>> + .enable = rm68200_enable,
>> + .get_modes = rm68200_get_modes,
>> +};
>> +
>> +static int rm68200_probe(struct mipi_dsi_device *dsi)
>> +{
>> + struct device *dev = &dsi->dev;
>> + struct device_node *backlight;
>> + struct rm68200 *ctx;
>> + int ret;
>> +
>> + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>> + if (!ctx)
>> + return -ENOMEM;
>> +
>> + ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
>> + if (IS_ERR(ctx->reset_gpio)) {
>> + dev_err(dev, "cannot get reset-gpio\n");
>> + return PTR_ERR(ctx->reset_gpio);
>> + }
>> +
>> + ctx->supply = devm_regulator_get(dev, "power");
>> + if (IS_ERR(ctx->supply)) {
>> + dev_err(dev, "cannot get regulator\n");
>> + return PTR_ERR(ctx->supply);
>> + }
>> +
>> + backlight = of_parse_phandle(dev->of_node, "backlight", 0);
>> + if (backlight) {
>> + ctx->bl_dev = of_find_backlight_by_node(backlight);
>> + of_node_put(backlight);
>> +
>> + if (!ctx->bl_dev)
>> + return -EPROBE_DEFER;
>> + }
>
> devm_of_find_backlight()
>
>> +
>> + mipi_dsi_set_drvdata(dsi, ctx);
>> +
>> + ctx->dev = dev;
>> +
>> + dsi->lanes = 2;
>> + dsi->format = MIPI_DSI_FMT_RGB888;
>> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
>> + MIPI_DSI_MODE_LPM;
>> +
>> + drm_panel_init(&ctx->panel);
>> + ctx->panel.dev = dev;
>> + ctx->panel.funcs = &rm68200_drm_funcs;
>> +
>> + drm_panel_add(&ctx->panel);
>> +
>> + ret = mipi_dsi_attach(dsi);
>> + if (ret < 0) {
>> + dev_err(dev, "mipi_dsi_attach failed. Is host ready?\n");
>> + drm_panel_remove(&ctx->panel);
>> + if (ctx->bl_dev)
>> + put_device(&ctx->bl_dev->dev);
>> + return ret;
>> + }
>> +
>> + DRM_INFO(DRV_NAME "_panel %ux%u@%u %ubpp dsi %udl - ready\n",
>> + default_mode.hdisplay, default_mode.vdisplay,
>> + default_mode.vrefresh,
>> + mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
>
> No need to brag about this being successful. That's what it's supposed
> to be. You should let the user know if things *don't* happen the way
> they're supposed to.
>
>> +
>> + return 0;
>> +}
>> +
>> +static int rm68200_remove(struct mipi_dsi_device *dsi)
>> +{
>> + struct rm68200 *ctx = mipi_dsi_get_drvdata(dsi);
>> +
>> + if (ctx->bl_dev)
>> + put_device(&ctx->bl_dev->dev);
>> +
>> + mipi_dsi_detach(dsi);
>> + drm_panel_remove(&ctx->panel);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id raydium_rm68200_of_match[] = {
>> + { .compatible = "raydium,rm68200" },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(of, raydium_rm68200_of_match);
>> +
>> +static struct mipi_dsi_driver raydium_rm68200_driver = {
>> + .probe = rm68200_probe,
>> + .remove = rm68200_remove,
>> + .driver = {
>> + .name = DRV_NAME "_panel",
>
> This is the only occurrence so you can just drop DRV_NAME and put the
> name here.
>
>> + .of_match_table = raydium_rm68200_of_match,
>> + },
>> +};
>> +module_mipi_dsi_driver(raydium_rm68200_driver);
>> +
>> +MODULE_AUTHOR("Philippe Cornu <philippe.co...@st.com>");
>> +MODULE_AUTHOR("Yannick Fertre <yannick.fer...@st.com>");
>> +MODULE_DESCRIPTION("DRM Driver for Raydium RM68200 MIPI DSI panel");
>
> You use RM68200 here but in other places you use rm68200. Please be
> consistent. It seems like RM68200 is the "official" spelling, so stick
> to that in prose.
>
> Thierry
>
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