Subject: Re: [PATCH 15/18] drm/panel: Add Huarui LHR050H41 panel driver
To: Maxime Ripard <maxime.ripard@free-electrons.com>,
        Mark Brown <broonie@kernel.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Chen-Yu Tsai <wens@csie.org>
Cc: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org,
        Boris Brezillon <boris.brezillon@free-electrons.com>,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        Rob Herring <robh+dt@kernel.org>,
        Daniel Vetter <daniel.vetter@intel.com>,
        Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
        linux-arm-kernel@lists.infradead.org
From: Andrzej Hajda <a.hajda@samsung.com>
Message-id: <8ac2c8d3-0ed4-113f-b50a-077bb9249329@samsung.com>
Date: Fri, 14 Jul 2017 11:22:29 +0200
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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@free-electrons.com>
> ---
>  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@free-electrons.com>");
> +MODULE_DESCRIPTION("Huarui LHR050H41 LCD Driver");
> +MODULE_LICENSE("GPL v2");