Re: [PATCH 15/18] drm/panel: Add Huarui LHR050H41 panel driver

From: Andrzej Hajda
Date: Fri Jul 14 2017 - 05:22:42 EST

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In reply to: Maxime Ripard: "[PATCH 15/18] drm/panel: Add Huarui LHR050H41 panel driver"
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On 13.07.2017 16:13, Maxime Ripard wrote:
> The LHR050H41 panel is the panel shipped with the BananaPi M2-Magic. Add a
> driver for it.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/panel/Kconfig | 9 +-
> drivers/gpu/drm/panel/Makefile | 1 +-
> drivers/gpu/drm/panel/panel-huarui-lhr050h41.c | 444 ++++++++++++++++++-
> 3 files changed, 454 insertions(+)
> create mode 100644 drivers/gpu/drm/panel/panel-huarui-lhr050h41.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index d84a031fae24..eaa6e102775a 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -28,6 +28,15 @@ config DRM_PANEL_SIMPLE
> that it can be automatically turned off when the panel goes into a
> low power state.
>
> +config DRM_PANEL_HUARUI_LHR050H41
> + tristate "Huarui LHR050H41 panel"
> + depends on OF
> + depends on DRM_MIPI_DSI
> + depends on BACKLIGHT_CLASS_DEVICE
> + help
> + Say Y if you want to enable support for the Huarui Lighting
> + LHR05041 DSI panel. The panel has a 1280x720 resolution.
> +
> config DRM_PANEL_INNOLUX_P079ZCA
> tristate "Innolux P079ZCA panel"
> depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 9f6610d08b00..58de7a853898 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -1,5 +1,6 @@
> obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
> obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
> +obj-$(CONFIG_DRM_PANEL_HUARUI_LHR050H41) += panel-huarui-lhr050h41.o
> obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
> obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
> obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
> diff --git a/drivers/gpu/drm/panel/panel-huarui-lhr050h41.c b/drivers/gpu/drm/panel/panel-huarui-lhr050h41.c
> new file mode 100644
> index 000000000000..eb675eb9ee7d
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-huarui-lhr050h41.c
> @@ -0,0 +1,444 @@

No copyright/license/description at the beginning of the file.

> +#include <linux/backlight.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/errno.h>
> +#include <linux/fb.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include <linux/gpio/consumer.h>

It can be put in alphabetical order.

> +
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_panel.h>
> +
> +#include <video/mipi_display.h>
> +
> +struct lhr050h41 {
> + struct drm_panel panel;
> + struct mipi_dsi_device *dsi;
> +
> + struct backlight_device *backlight;
> + struct gpio_desc *power;
> + struct gpio_desc *reset;
> +};
> +
> +static inline struct lhr050h41 *panel_to_lhr050h41(struct drm_panel *panel)
> +{
> + return container_of(panel, struct lhr050h41, panel);
> +}
> +
> +static int lhr050h41_switch_page(struct lhr050h41 *ctx, u8 page)
> +{
> + u8 buf[4] = { 0xff, 0x98, 0x81, page };
> +
> + return mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
> +}
> +
> +static int lhr050h41_send_cmd_data(struct lhr050h41 *ctx, u8 cmd, u8 data)
> +{
> + u8 buf[2] = { cmd, data };
> +
> + return mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
> +}
> +
> +static int lhr050h41_send_init_sequence(struct lhr050h41 *ctx)
> +{
> + lhr050h41_switch_page(ctx, 3);

No error checking, here and below in most places.

> +
> + lhr050h41_send_cmd_data(ctx, 0x01, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x02, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x03, 0x73);
> + lhr050h41_send_cmd_data(ctx, 0x04, 0x03);
> + lhr050h41_send_cmd_data(ctx, 0x05, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x06, 0x06);
> + lhr050h41_send_cmd_data(ctx, 0x07, 0x06);
> + lhr050h41_send_cmd_data(ctx, 0x08, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x09, 0x18);
> + lhr050h41_send_cmd_data(ctx, 0x0a, 0x04);
> + lhr050h41_send_cmd_data(ctx, 0x0b, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x0c, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x0d, 0x03);
> + lhr050h41_send_cmd_data(ctx, 0x0e, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x0f, 0x25);
> + lhr050h41_send_cmd_data(ctx, 0x10, 0x25);
> + lhr050h41_send_cmd_data(ctx, 0x11, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x12, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x13, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x14, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x15, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x16, 0x0C);
> + lhr050h41_send_cmd_data(ctx, 0x17, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x18, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x19, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x1a, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x1b, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x1c, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x1d, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x1e, 0xC0);
> + lhr050h41_send_cmd_data(ctx, 0x1f, 0x80);
> + lhr050h41_send_cmd_data(ctx, 0x20, 0x04);
> + lhr050h41_send_cmd_data(ctx, 0x21, 0x01);
> + lhr050h41_send_cmd_data(ctx, 0x22, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x23, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x24, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x25, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x26, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x27, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x28, 0x33);
> + lhr050h41_send_cmd_data(ctx, 0x29, 0x03);
> + lhr050h41_send_cmd_data(ctx, 0x2a, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x2b, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x2c, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x2d, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x2e, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x2f, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x30, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x31, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x32, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x33, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x34, 0x04);
> + lhr050h41_send_cmd_data(ctx, 0x35, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x36, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x37, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x38, 0x3C);
> + lhr050h41_send_cmd_data(ctx, 0x39, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x3a, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x3b, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x3c, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x3d, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x3e, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x3f, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x40, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x41, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x42, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x43, 0x00);
> + lhr050h41_send_cmd_data(ctx, 0x44, 0x00);
> +
> + lhr050h41_send_cmd_data(ctx, 0x50, 0x01);
> + lhr050h41_send_cmd_data(ctx, 0x51, 0x23);
> + lhr050h41_send_cmd_data(ctx, 0x52, 0x45);
> + lhr050h41_send_cmd_data(ctx, 0x53, 0x67);
> + lhr050h41_send_cmd_data(ctx, 0x54, 0x89);
> + lhr050h41_send_cmd_data(ctx, 0x55, 0xab);
> + lhr050h41_send_cmd_data(ctx, 0x56, 0x01);
> + lhr050h41_send_cmd_data(ctx, 0x57, 0x23);
> + lhr050h41_send_cmd_data(ctx, 0x58, 0x45);
> + lhr050h41_send_cmd_data(ctx, 0x59, 0x67);
> + lhr050h41_send_cmd_data(ctx, 0x5a, 0x89);
> + lhr050h41_send_cmd_data(ctx, 0x5b, 0xab);
> + lhr050h41_send_cmd_data(ctx, 0x5c, 0xcd);
> + lhr050h41_send_cmd_data(ctx, 0x5d, 0xef);
> +
> + lhr050h41_send_cmd_data(ctx, 0x5e, 0x11);
> + lhr050h41_send_cmd_data(ctx, 0x5f, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x60, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x61, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x62, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x63, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x64, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x65, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x66, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x67, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x68, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x69, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x6a, 0x0C);
> + lhr050h41_send_cmd_data(ctx, 0x6b, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x6c, 0x0F);
> + lhr050h41_send_cmd_data(ctx, 0x6d, 0x0E);
> + lhr050h41_send_cmd_data(ctx, 0x6e, 0x0D);
> + lhr050h41_send_cmd_data(ctx, 0x6f, 0x06);
> + lhr050h41_send_cmd_data(ctx, 0x70, 0x07);
> + lhr050h41_send_cmd_data(ctx, 0x71, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x72, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x73, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x74, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x75, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x76, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x77, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x78, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x79, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x7a, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x7b, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x7c, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x7d, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x7e, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x7f, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x80, 0x0C);
> + lhr050h41_send_cmd_data(ctx, 0x81, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x82, 0x0F);
> + lhr050h41_send_cmd_data(ctx, 0x83, 0x0E);
> + lhr050h41_send_cmd_data(ctx, 0x84, 0x0D);
> + lhr050h41_send_cmd_data(ctx, 0x85, 0x06);
> + lhr050h41_send_cmd_data(ctx, 0x86, 0x07);
> + lhr050h41_send_cmd_data(ctx, 0x87, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x88, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x89, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x8A, 0x02);
> +
> + lhr050h41_switch_page(ctx, 4);
> + lhr050h41_send_cmd_data(ctx, 0x6C, 0x15);
> + lhr050h41_send_cmd_data(ctx, 0x6E, 0x22);
> + lhr050h41_send_cmd_data(ctx, 0x6F, 0x33);
> + lhr050h41_send_cmd_data(ctx, 0x3A, 0xA4);
> + lhr050h41_send_cmd_data(ctx, 0x8D, 0x0D);
> + lhr050h41_send_cmd_data(ctx, 0x87, 0xBA);
> + lhr050h41_send_cmd_data(ctx, 0x26, 0x76);
> + lhr050h41_send_cmd_data(ctx, 0xB2, 0xD1);
> +
> + lhr050h41_switch_page(ctx, 1);
> + lhr050h41_send_cmd_data(ctx, 0x22, 0x0A);
> + lhr050h41_send_cmd_data(ctx, 0x53, 0xDC);
> + lhr050h41_send_cmd_data(ctx, 0x55, 0xA7);
> + lhr050h41_send_cmd_data(ctx, 0x50, 0x78);
> + lhr050h41_send_cmd_data(ctx, 0x51, 0x78);
> + lhr050h41_send_cmd_data(ctx, 0x31, 0x02);
> + lhr050h41_send_cmd_data(ctx, 0x60, 0x14);
> + lhr050h41_send_cmd_data(ctx, 0xA0, 0x2A);
> + lhr050h41_send_cmd_data(ctx, 0xA1, 0x39);
> + lhr050h41_send_cmd_data(ctx, 0xA2, 0x46);
> + lhr050h41_send_cmd_data(ctx, 0xA3, 0x0e);
> + lhr050h41_send_cmd_data(ctx, 0xA4, 0x12);
> + lhr050h41_send_cmd_data(ctx, 0xA5, 0x25);
> + lhr050h41_send_cmd_data(ctx, 0xA6, 0x19);
> + lhr050h41_send_cmd_data(ctx, 0xA7, 0x1d);
> + lhr050h41_send_cmd_data(ctx, 0xA8, 0xa6);
> + lhr050h41_send_cmd_data(ctx, 0xA9, 0x1C);
> + lhr050h41_send_cmd_data(ctx, 0xAA, 0x29);
> + lhr050h41_send_cmd_data(ctx, 0xAB, 0x85);
> + lhr050h41_send_cmd_data(ctx, 0xAC, 0x1C);
> + lhr050h41_send_cmd_data(ctx, 0xAD, 0x1B);
> + lhr050h41_send_cmd_data(ctx, 0xAE, 0x51);
> + lhr050h41_send_cmd_data(ctx, 0xAF, 0x22);
> + lhr050h41_send_cmd_data(ctx, 0xB0, 0x2d);
> + lhr050h41_send_cmd_data(ctx, 0xB1, 0x4f);
> + lhr050h41_send_cmd_data(ctx, 0xB2, 0x59);
> + lhr050h41_send_cmd_data(ctx, 0xB3, 0x3F);
> + lhr050h41_send_cmd_data(ctx, 0xC0, 0x2A);
> + lhr050h41_send_cmd_data(ctx, 0xC1, 0x3a);
> + lhr050h41_send_cmd_data(ctx, 0xC2, 0x45);
> + lhr050h41_send_cmd_data(ctx, 0xC3, 0x0e);
> + lhr050h41_send_cmd_data(ctx, 0xC4, 0x11);
> + lhr050h41_send_cmd_data(ctx, 0xC5, 0x24);
> + lhr050h41_send_cmd_data(ctx, 0xC6, 0x1a);
> + lhr050h41_send_cmd_data(ctx, 0xC7, 0x1c);
> + lhr050h41_send_cmd_data(ctx, 0xC8, 0xaa);
> + lhr050h41_send_cmd_data(ctx, 0xC9, 0x1C);
> + lhr050h41_send_cmd_data(ctx, 0xCA, 0x29);
> + lhr050h41_send_cmd_data(ctx, 0xCB, 0x96);
> + lhr050h41_send_cmd_data(ctx, 0xCC, 0x1C);
> + lhr050h41_send_cmd_data(ctx, 0xCD, 0x1B);
> + lhr050h41_send_cmd_data(ctx, 0xCE, 0x51);
> + lhr050h41_send_cmd_data(ctx, 0xCF, 0x22);
> + lhr050h41_send_cmd_data(ctx, 0xD0, 0x2b);
> + lhr050h41_send_cmd_data(ctx, 0xD1, 0x4b);
> + lhr050h41_send_cmd_data(ctx, 0xD2, 0x59);
> + lhr050h41_send_cmd_data(ctx, 0xD3, 0x3F);

I think you can put all above codes into some array and call it in loop,
with error checking.

> +
> + lhr050h41_switch_page(ctx, 0);
> + lhr050h41_send_cmd_data(ctx, 0x35, 0x00);

mipi_dsi_dcs_set_tear_on

> + lhr050h41_send_cmd_data(ctx, 0x11, 0x00);

mipi_dsi_dcs_exit_sleep_mode

> +
> + mdelay(120);
I think it should be moved to enable callback, more about it below.
> +
> + lhr050h41_send_cmd_data(ctx, 0x29, 0x00);

mipi_dsi_dcs_set_display_on

> +
> + mdelay(20);
> +
> + return 0;
> +}
> +
> +static int lhr050h41_prepare(struct drm_panel *panel)
> +{
> + struct lhr050h41 *ctx = panel_to_lhr050h41(panel);
> +
> + /* Power the panel */
> + gpiod_set_value(ctx->power, 1);
> + mdelay(5);
> +
> + /* And reset it */
> + gpiod_set_value(ctx->reset, 1);
> + mdelay(20);
> +
> + gpiod_set_value(ctx->reset, 0);
> + mdelay(20);
> +
> + lhr050h41_send_init_sequence(ctx);
> +
> + return 0;
> +}
> +
> +static void lhr050h41_enable_bl(struct lhr050h41 *ctx, bool enable)
> +{
> + if (!ctx->backlight)
> + return;
> +
> + if (enable) {
> + ctx->backlight->props.state &= ~BL_CORE_FBBLANK;
> + ctx->backlight->props.power = FB_BLANK_UNBLANK;
> + } else {
> + ctx->backlight->props.power = FB_BLANK_POWERDOWN;
> + ctx->backlight->props.state |= BL_CORE_FBBLANK;
> + }
> +
> + backlight_update_status(ctx->backlight);
> +}
> +
> +static int lhr050h41_enable(struct drm_panel *panel)
> +{
> + struct lhr050h41 *ctx = panel_to_lhr050h41(panel);
> +
> + lhr050h41_enable_bl(ctx, true);
> +
> + return 0;
> +}

Usually purpose of mdelay(120) is to wait for finishing initialization
and transmission of first frames to the panel.
So I guess mdelay(120) and mipi_dsi_dcs_set_display_on should be moved
to _enable callback, otherwise you risk having garbage on the screen at
start.

> +
> +static int lhr050h41_disable(struct drm_panel *panel)
> +{
> + struct lhr050h41 *ctx = panel_to_lhr050h41(panel);
> +
> + lhr050h41_enable_bl(ctx, false);
> +
> + return mipi_dsi_dcs_set_display_off(ctx->dsi);
> +}
> +
> +static int lhr050h41_unprepare(struct drm_panel *panel)
> +{
> + struct lhr050h41 *ctx = panel_to_lhr050h41(panel);
> +
> + mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
> + gpiod_set_value(ctx->power, 0);
> + gpiod_set_value(ctx->reset, 1);
> +
> + return 0;
> +}
> +
> +static const struct drm_display_mode default_mode = {
> + .clock = 62000,
> + .vrefresh = 60,
> +
> + .hdisplay = 720,
> + .hsync_start = 720 + 10,
> + .hsync_end = 720 + 10 + 20,
> + .htotal = 720 + 10 + 20 + 30,
> +
> + .vdisplay = 1280,
> + .vsync_start = 1280 + 10,
> + .vsync_end = 1280 + 10 + 10,
> + .vtotal = 1280 + 10 + 10 + 20,
> +};
> +
> +static int lhr050h41_get_modes(struct drm_panel *panel)
> +{
> + struct drm_connector *connector = panel->connector;
> + struct lhr050h41 *ctx = panel_to_lhr050h41(panel);
> + struct drm_display_mode *mode;
> +
> + mode = drm_mode_duplicate(panel->drm, &default_mode);
> + if (!mode) {
> + dev_err(&ctx->dsi->dev, "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(connector, mode);
> +
> + panel->connector->display_info.width_mm = 62;
> + panel->connector->display_info.height_mm = 110;
> +
> + return 1;
> +}
> +
> +static const struct drm_panel_funcs lhr050h41_funcs = {
> + .prepare = lhr050h41_prepare,
> + .unprepare = lhr050h41_unprepare,
> + .enable = lhr050h41_enable,
> + .disable = lhr050h41_disable,
> + .get_modes = lhr050h41_get_modes,
> +};
> +
> +static int lhr050h41_dsi_probe(struct mipi_dsi_device *dsi)
> +{
> + struct device_node *np;
> + struct lhr050h41 *ctx;
> + int ret;
> +
> + ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
> + if (!ctx)
> + return -ENOMEM;
> + mipi_dsi_set_drvdata(dsi, ctx);
> + ctx->dsi = dsi;
> +
> + drm_panel_init(&ctx->panel);
> + ctx->panel.dev = &dsi->dev;
> + ctx->panel.funcs = &lhr050h41_funcs;
> +
> + ctx->power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW);
> + if (IS_ERR(ctx->power)) {
> + dev_err(&dsi->dev, "Couldn't get our power GPIO\n");
> + return PTR_ERR(ctx->power);
> + }
> +
> + ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(ctx->reset)) {
> + dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
> + return PTR_ERR(ctx->reset);
> + }
> +
> + np = of_parse_phandle(dsi->dev.of_node, "backlight", 0);
> + if (np) {
> + ctx->backlight = of_find_backlight_by_node(np);
> + of_node_put(np);
> +
> + if (!ctx->backlight)
> + return -EPROBE_DEFER;
> + }
> +
> + ret = drm_panel_add(&ctx->panel);
> + if (ret < 0)
> + return ret;
> +
> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE;

I guess MIPI_DSI_MODE_VIDEO should be also here.

Regards
Andrzej

> + dsi->format = MIPI_DSI_FMT_RGB888;
> + dsi->lanes = 4;
> +
> + return mipi_dsi_attach(dsi);
> +}
> +
> +static int lhr050h41_dsi_remove(struct mipi_dsi_device *dsi)
> +{
> + struct lhr050h41 *ctx = mipi_dsi_get_drvdata(dsi);
> +
> + mipi_dsi_detach(dsi);
> + drm_panel_remove(&ctx->panel);
> +
> + if (ctx->backlight)
> + put_device(&ctx->backlight->dev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id lhr050h41_of_match[] = {
> + { .compatible = "huarui,lhr050h41" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, lhr050h41_of_match);
> +
> +static struct mipi_dsi_driver lhr050h41_dsi_driver = {
> + .probe = lhr050h41_dsi_probe,
> + .remove = lhr050h41_dsi_remove,
> + .driver = {
> + .name = "lhr050h41-dsi",
> + .of_match_table = lhr050h41_of_match,
> + },
> +};
> +module_mipi_dsi_driver(lhr050h41_dsi_driver);
> +
> +MODULE_AUTHOR("Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Huarui LHR050H41 LCD Driver");
> +MODULE_LICENSE("GPL v2");

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