Commit 6ea4383b authored by Heiko Stuebner's avatar Heiko Stuebner Committed by Sam Ravnborg
Browse files

drm/panel: add panel driver for Leadtek LTK050H3146W 



The LTK050H3146W is 5.0" 720x1280 DSI display. There are two variants
with essentially the same name, LTK050H3146W and LTK050H3146W-A2.

They differ in their init sequence and mode details.

changes in v2:
- add display variants
changes in v3:
- fixed indentation and artifacts found by Sam

Signed-off-by: default avatarHeiko Stuebner <heiko.stuebner@theobroma-systems.com>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200408085317.2624599-2-heiko@sntech.de
parent 17434fba

drivers/gpu/drm/panel/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -137,6 +137,17 @@ config DRM_PANEL_KINGDISPLAY_KD097D04 
	  24 bit RGB per pixel. It provides a MIPI DSI interface to

	  the host and has a built-in LED backlight.



config DRM_PANEL_LEADTEK_LTK050H3146W

	tristate "Leadtek LTK050H3146W panel"

	depends on OF

	depends on DRM_MIPI_DSI

	depends on BACKLIGHT_CLASS_DEVICE

	help

	  Say Y here if you want to enable support for Leadtek LTK050H3146W

	  TFT-LCD modules. The panel has a 720x1280 resolution and uses

	  24 bit RGB per pixel. It provides a MIPI DSI interface to

	  the host and has a built-in LED backlight.



config DRM_PANEL_LEADTEK_LTK500HD1829

	tristate "Leadtek LTK500HD1829 panel"

	depends on OF

drivers/gpu/drm/panel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o 
obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o

obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o

obj-$(CONFIG_DRM_PANEL_KINGDISPLAY_KD097D04) += panel-kingdisplay-kd097d04.o

obj-$(CONFIG_DRM_PANEL_LEADTEK_LTK050H3146W) += panel-leadtek-ltk050h3146w.o

obj-$(CONFIG_DRM_PANEL_LEADTEK_LTK500HD1829) += panel-leadtek-ltk500hd1829.o

obj-$(CONFIG_DRM_PANEL_LG_LB035Q02) += panel-lg-lb035q02.o

obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o

drivers/gpu/drm/panel/panel-leadtek-ltk050h3146w.c

0 → 100644
+691 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2020 Theobroma Systems Design und Consulting GmbH

 */



#include <linux/delay.h>

#include <linux/gpio/consumer.h>

#include <linux/media-bus-format.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/regulator/consumer.h>



#include <video/display_timing.h>

#include <video/mipi_display.h>



#include <drm/drm_mipi_dsi.h>

#include <drm/drm_modes.h>

#include <drm/drm_panel.h>

#include <drm/drm_print.h>



struct ltk050h3146w_cmd {

	char cmd;

	char data;

};



struct ltk050h3146w;

struct ltk050h3146w_desc {

	const struct drm_display_mode *mode;

	int (*init)(struct ltk050h3146w *ctx);

};



struct ltk050h3146w {

	struct device *dev;

	struct drm_panel panel;

	struct gpio_desc *reset_gpio;

	struct regulator *vci;

	struct regulator *iovcc;

	const struct ltk050h3146w_desc *panel_desc;

	bool prepared;

};



static const struct ltk050h3146w_cmd page1_cmds[] = {

	{ 0x22, 0x0A }, /* BGR SS GS */

	{ 0x31, 0x00 }, /* column inversion */

	{ 0x53, 0xA2 }, /* VCOM1 */

	{ 0x55, 0xA2 }, /* VCOM2 */

	{ 0x50, 0x81 }, /* VREG1OUT=5V */

	{ 0x51, 0x85 }, /* VREG2OUT=-5V */

	{ 0x62, 0x0D }, /* EQT Time setting */

/*

 * The vendor init selected page 1 here _again_

 * Is this supposed to be page 2?

 */

	{ 0xA0, 0x00 },

	{ 0xA1, 0x1A },

	{ 0xA2, 0x28 },

	{ 0xA3, 0x13 },

	{ 0xA4, 0x16 },

	{ 0xA5, 0x29 },

	{ 0xA6, 0x1D },

	{ 0xA7, 0x1E },

	{ 0xA8, 0x84 },

	{ 0xA9, 0x1C },

	{ 0xAA, 0x28 },

	{ 0xAB, 0x75 },

	{ 0xAC, 0x1A },

	{ 0xAD, 0x19 },

	{ 0xAE, 0x4D },

	{ 0xAF, 0x22 },

	{ 0xB0, 0x28 },

	{ 0xB1, 0x54 },

	{ 0xB2, 0x66 },

	{ 0xB3, 0x39 },

	{ 0xC0, 0x00 },

	{ 0xC1, 0x1A },

	{ 0xC2, 0x28 },

	{ 0xC3, 0x13 },

	{ 0xC4, 0x16 },

	{ 0xC5, 0x29 },

	{ 0xC6, 0x1D },

	{ 0xC7, 0x1E },

	{ 0xC8, 0x84 },

	{ 0xC9, 0x1C },

	{ 0xCA, 0x28 },

	{ 0xCB, 0x75 },

	{ 0xCC, 0x1A },

	{ 0xCD, 0x19 },

	{ 0xCE, 0x4D },

	{ 0xCF, 0x22 },

	{ 0xD0, 0x28 },

	{ 0xD1, 0x54 },

	{ 0xD2, 0x66 },

	{ 0xD3, 0x39 },

};



static const struct ltk050h3146w_cmd page3_cmds[] = {

	{ 0x01, 0x00 },

	{ 0x02, 0x00 },

	{ 0x03, 0x73 },

	{ 0x04, 0x00 },

	{ 0x05, 0x00 },

	{ 0x06, 0x0a },

	{ 0x07, 0x00 },

	{ 0x08, 0x00 },

	{ 0x09, 0x01 },

	{ 0x0a, 0x00 },

	{ 0x0b, 0x00 },

	{ 0x0c, 0x01 },

	{ 0x0d, 0x00 },

	{ 0x0e, 0x00 },

	{ 0x0f, 0x1d },

	{ 0x10, 0x1d },

	{ 0x11, 0x00 },

	{ 0x12, 0x00 },

	{ 0x13, 0x00 },

	{ 0x14, 0x00 },

	{ 0x15, 0x00 },

	{ 0x16, 0x00 },

	{ 0x17, 0x00 },

	{ 0x18, 0x00 },

	{ 0x19, 0x00 },

	{ 0x1a, 0x00 },

	{ 0x1b, 0x00 },

	{ 0x1c, 0x00 },

	{ 0x1d, 0x00 },

	{ 0x1e, 0x40 },

	{ 0x1f, 0x80 },

	{ 0x20, 0x06 },

	{ 0x21, 0x02 },

	{ 0x22, 0x00 },

	{ 0x23, 0x00 },

	{ 0x24, 0x00 },

	{ 0x25, 0x00 },

	{ 0x26, 0x00 },

	{ 0x27, 0x00 },

	{ 0x28, 0x33 },

	{ 0x29, 0x03 },

	{ 0x2a, 0x00 },

	{ 0x2b, 0x00 },

	{ 0x2c, 0x00 },

	{ 0x2d, 0x00 },

	{ 0x2e, 0x00 },

	{ 0x2f, 0x00 },

	{ 0x30, 0x00 },

	{ 0x31, 0x00 },

	{ 0x32, 0x00 },

	{ 0x33, 0x00 },

	{ 0x34, 0x04 },

	{ 0x35, 0x00 },

	{ 0x36, 0x00 },

	{ 0x37, 0x00 },

	{ 0x38, 0x3C },

	{ 0x39, 0x35 },

	{ 0x3A, 0x01 },

	{ 0x3B, 0x40 },

	{ 0x3C, 0x00 },

	{ 0x3D, 0x01 },

	{ 0x3E, 0x00 },

	{ 0x3F, 0x00 },

	{ 0x40, 0x00 },

	{ 0x41, 0x88 },

	{ 0x42, 0x00 },

	{ 0x43, 0x00 },

	{ 0x44, 0x1F },

	{ 0x50, 0x01 },

	{ 0x51, 0x23 },

	{ 0x52, 0x45 },

	{ 0x53, 0x67 },

	{ 0x54, 0x89 },

	{ 0x55, 0xab },

	{ 0x56, 0x01 },

	{ 0x57, 0x23 },

	{ 0x58, 0x45 },

	{ 0x59, 0x67 },

	{ 0x5a, 0x89 },

	{ 0x5b, 0xab },

	{ 0x5c, 0xcd },

	{ 0x5d, 0xef },

	{ 0x5e, 0x11 },

	{ 0x5f, 0x01 },

	{ 0x60, 0x00 },

	{ 0x61, 0x15 },

	{ 0x62, 0x14 },

	{ 0x63, 0x0E },

	{ 0x64, 0x0F },

	{ 0x65, 0x0C },

	{ 0x66, 0x0D },

	{ 0x67, 0x06 },

	{ 0x68, 0x02 },

	{ 0x69, 0x07 },

	{ 0x6a, 0x02 },

	{ 0x6b, 0x02 },

	{ 0x6c, 0x02 },

	{ 0x6d, 0x02 },

	{ 0x6e, 0x02 },

	{ 0x6f, 0x02 },

	{ 0x70, 0x02 },

	{ 0x71, 0x02 },

	{ 0x72, 0x02 },

	{ 0x73, 0x02 },

	{ 0x74, 0x02 },

	{ 0x75, 0x01 },

	{ 0x76, 0x00 },

	{ 0x77, 0x14 },

	{ 0x78, 0x15 },

	{ 0x79, 0x0E },

	{ 0x7a, 0x0F },

	{ 0x7b, 0x0C },

	{ 0x7c, 0x0D },

	{ 0x7d, 0x06 },

	{ 0x7e, 0x02 },

	{ 0x7f, 0x07 },

	{ 0x80, 0x02 },

	{ 0x81, 0x02 },

	{ 0x82, 0x02 },

	{ 0x83, 0x02 },

	{ 0x84, 0x02 },

	{ 0x85, 0x02 },

	{ 0x86, 0x02 },

	{ 0x87, 0x02 },

	{ 0x88, 0x02 },

	{ 0x89, 0x02 },

	{ 0x8A, 0x02 },

};



static const struct ltk050h3146w_cmd page4_cmds[] = {

	{ 0x70, 0x00 },

	{ 0x71, 0x00 },

	{ 0x82, 0x0F }, /* VGH_MOD clamp level=15v */

	{ 0x84, 0x0F }, /* VGH clamp level 15V */

	{ 0x85, 0x0D }, /* VGL clamp level (-10V) */

	{ 0x32, 0xAC },

	{ 0x8C, 0x80 },

	{ 0x3C, 0xF5 },

	{ 0xB5, 0x07 }, /* GAMMA OP */

	{ 0x31, 0x45 }, /* SOURCE OP */

	{ 0x3A, 0x24 }, /* PS_EN OFF */

	{ 0x88, 0x33 }, /* LVD */

};



static inline

struct ltk050h3146w *panel_to_ltk050h3146w(struct drm_panel *panel)

{

	return container_of(panel, struct ltk050h3146w, panel);

}



#define dsi_dcs_write_seq(dsi, cmd, seq...) do {			\

		static const u8 d[] = { seq };				\

		int ret;						\

		ret = mipi_dsi_dcs_write(dsi, cmd, d, ARRAY_SIZE(d));	\

		if (ret < 0)						\

			return ret;					\

	} while (0)



static int ltk050h3146w_init_sequence(struct ltk050h3146w *ctx)

{

	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);

	int ret;



	/*

	 * Init sequence was supplied by the panel vendor without much

	 * documentation.

	 */

	dsi_dcs_write_seq(dsi, 0xdf, 0x93, 0x65, 0xf8);

	dsi_dcs_write_seq(dsi, 0xb0, 0x01, 0x03, 0x02, 0x00, 0x64, 0x06,

			  0x01);

	dsi_dcs_write_seq(dsi, 0xb2, 0x00, 0xb5);

	dsi_dcs_write_seq(dsi, 0xb3, 0x00, 0xb5);

	dsi_dcs_write_seq(dsi, 0xb7, 0x00, 0xbf, 0x00, 0x00, 0xbf, 0x00);



	dsi_dcs_write_seq(dsi, 0xb9, 0x00, 0xc4, 0x23, 0x07);

	dsi_dcs_write_seq(dsi, 0xbb, 0x02, 0x01, 0x24, 0x00, 0x28, 0x0f,

			  0x28, 0x04, 0xcc, 0xcc, 0xcc);

	dsi_dcs_write_seq(dsi, 0xbc, 0x0f, 0x04);

	dsi_dcs_write_seq(dsi, 0xbe, 0x1e, 0xf2);

	dsi_dcs_write_seq(dsi, 0xc0, 0x26, 0x03);

	dsi_dcs_write_seq(dsi, 0xc1, 0x00, 0x12);

	dsi_dcs_write_seq(dsi, 0xc3, 0x04, 0x02, 0x02, 0x76, 0x01, 0x80,

			  0x80);

	dsi_dcs_write_seq(dsi, 0xc4, 0x24, 0x80, 0xb4, 0x81, 0x12, 0x0f,

			  0x16, 0x00, 0x00);

	dsi_dcs_write_seq(dsi, 0xc8, 0x7f, 0x72, 0x67, 0x5d, 0x5d, 0x50,

			  0x56, 0x41, 0x59, 0x57, 0x55, 0x70, 0x5b, 0x5f,

			  0x4f, 0x47, 0x38, 0x23, 0x08, 0x7f, 0x72, 0x67,

			  0x5d, 0x5d, 0x50, 0x56, 0x41, 0x59, 0x57, 0x55,

			  0x70, 0x5b, 0x5f, 0x4f, 0x47, 0x38, 0x23, 0x08);

	dsi_dcs_write_seq(dsi, 0xd0, 0x1e, 0x1f, 0x57, 0x58, 0x48, 0x4a,

			  0x44, 0x46, 0x40, 0x1f, 0x42, 0x1f, 0x1f, 0x1f,

			  0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f);

	dsi_dcs_write_seq(dsi, 0xd1, 0x1e, 0x1f, 0x57, 0x58, 0x49, 0x4b,

			  0x45, 0x47, 0x41, 0x1f, 0x43, 0x1f, 0x1f, 0x1f,

			  0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f);

	dsi_dcs_write_seq(dsi, 0xd2, 0x1f, 0x1e, 0x17, 0x18, 0x07, 0x05,

			  0x0b, 0x09, 0x03, 0x1f, 0x01, 0x1f, 0x1f, 0x1f,

			  0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f);

	dsi_dcs_write_seq(dsi, 0xd3, 0x1f, 0x1e, 0x17, 0x18, 0x06, 0x04,

			  0x0a, 0x08, 0x02, 0x1f, 0x00, 0x1f, 0x1f, 0x1f,

			  0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f);

	dsi_dcs_write_seq(dsi, 0xd4, 0x00, 0x00, 0x00, 0x0c, 0x06, 0x20,

			  0x01, 0x02, 0x00, 0x60, 0x15, 0xb0, 0x30, 0x03,

			  0x04, 0x00, 0x60, 0x72, 0x0a, 0x00, 0x60, 0x08);

	dsi_dcs_write_seq(dsi, 0xd5, 0x00, 0x06, 0x06, 0x00, 0x30, 0x00,

			  0x00, 0x00, 0x00, 0x00, 0xbc, 0x50, 0x00, 0x05,

			  0x21, 0x00, 0x60);

	dsi_dcs_write_seq(dsi, 0xdd, 0x2c, 0xa3, 0x00);

	dsi_dcs_write_seq(dsi, 0xde, 0x02);

	dsi_dcs_write_seq(dsi, 0xb2, 0x32, 0x1c);

	dsi_dcs_write_seq(dsi, 0xb7, 0x3b, 0x70, 0x00, 0x04);

	dsi_dcs_write_seq(dsi, 0xc1, 0x11);

	dsi_dcs_write_seq(dsi, 0xbb, 0x21, 0x22, 0x23, 0x24, 0x36, 0x37);

	dsi_dcs_write_seq(dsi, 0xc2, 0x20, 0x38, 0x1e, 0x84);

	dsi_dcs_write_seq(dsi, 0xde, 0x00);



	ret = mipi_dsi_dcs_set_tear_on(dsi, 1);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev, "failed to set tear on: %d\n",

			      ret);

		return ret;

	}



	msleep(60);



	return 0;

}



static const struct drm_display_mode ltk050h3146w_mode = {

	.hdisplay	= 720,

	.hsync_start	= 720 + 42,

	.hsync_end	= 720 + 42 + 8,

	.htotal		= 720 + 42 + 8 + 42,

	.vdisplay	= 1280,

	.vsync_start	= 1280 + 12,

	.vsync_end	= 1280 + 12 + 4,

	.vtotal		= 1280 + 12 + 4 + 18,

	.clock		= 64018,

	.width_mm	= 62,

	.height_mm	= 110,

};



static const struct ltk050h3146w_desc ltk050h3146w_data = {

	.mode = &ltk050h3146w_mode,

	.init = ltk050h3146w_init_sequence,

};



static int ltk050h3146w_a2_select_page(struct ltk050h3146w *ctx, int page)

{

	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);

	u8 d[3] = { 0x98, 0x81, page };



	return mipi_dsi_dcs_write(dsi, 0xff, d, ARRAY_SIZE(d));

}



static int ltk050h3146w_a2_write_page(struct ltk050h3146w *ctx, int page,

				      const struct ltk050h3146w_cmd *cmds,

				      int num)

{

	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);

	int i, ret;



	ret = ltk050h3146w_a2_select_page(ctx, page);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev, "failed to select page %d: %d\n",

			      page, ret);

		return ret;

	}



	for (i = 0; i < num; i++) {

		ret = mipi_dsi_generic_write(dsi, &cmds[i],

					     sizeof(struct ltk050h3146w_cmd));

		if (ret < 0) {

			DRM_DEV_ERROR(ctx->dev,

				      "failed to write page %d init cmds: %d\n",

				       page, ret);

			return ret;

		}

	}



	return 0;

}



static int ltk050h3146w_a2_init_sequence(struct ltk050h3146w *ctx)

{

	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);

	int ret;



	/*

	 * Init sequence was supplied by the panel vendor without much

	 * documentation.

	 */

	ret = ltk050h3146w_a2_write_page(ctx, 3, page3_cmds,

					 ARRAY_SIZE(page3_cmds));

	if (ret < 0)

		return ret;



	ret = ltk050h3146w_a2_write_page(ctx, 4, page4_cmds,

					 ARRAY_SIZE(page4_cmds));

	if (ret < 0)

		return ret;



	ret = ltk050h3146w_a2_write_page(ctx, 1, page1_cmds,

					 ARRAY_SIZE(page1_cmds));

	if (ret < 0)

		return ret;



	ret = ltk050h3146w_a2_select_page(ctx, 0);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev, "failed to select page 0: %d\n", ret);

		return ret;

	}



	/* vendor code called this without param, where there should be one */

	ret = mipi_dsi_dcs_set_tear_on(dsi, 0);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev, "failed to set tear on: %d\n",

			      ret);

		return ret;

	}



	msleep(60);



	return 0;

}



static const struct drm_display_mode ltk050h3146w_a2_mode = {

	.hdisplay	= 720,

	.hsync_start	= 720 + 42,

	.hsync_end	= 720 + 42 + 10,

	.htotal		= 720 + 42 + 10 + 60,

	.vdisplay	= 1280,

	.vsync_start	= 1280 + 18,

	.vsync_end	= 1280 + 18 + 4,

	.vtotal		= 1280 + 18 + 4 + 12,

	.clock		= 65595,

	.width_mm	= 62,

	.height_mm	= 110,

};



static const struct ltk050h3146w_desc ltk050h3146w_a2_data = {

	.mode = &ltk050h3146w_a2_mode,

	.init = ltk050h3146w_a2_init_sequence,

};



static int ltk050h3146w_unprepare(struct drm_panel *panel)

{

	struct ltk050h3146w *ctx = panel_to_ltk050h3146w(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 < 0) {

		DRM_DEV_ERROR(ctx->dev, "failed to set display off: %d\n",

			      ret);

		return ret;

	}



	mipi_dsi_dcs_enter_sleep_mode(dsi);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev, "failed to enter sleep mode: %d\n",

			      ret);

		return ret;

	}



	regulator_disable(ctx->iovcc);

	regulator_disable(ctx->vci);



	ctx->prepared = false;



	return 0;

}



static int ltk050h3146w_prepare(struct drm_panel *panel)

{

	struct ltk050h3146w *ctx = panel_to_ltk050h3146w(panel);

	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);

	int ret;



	if (ctx->prepared)

		return 0;



	DRM_DEV_DEBUG_DRIVER(ctx->dev, "Resetting the panel\n");

	ret = regulator_enable(ctx->vci);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev,

			      "Failed to enable vci supply: %d\n", ret);

		return ret;

	}

	ret = regulator_enable(ctx->iovcc);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev,

			      "Failed to enable iovcc supply: %d\n", ret);

		goto disable_vci;

	}



	gpiod_set_value_cansleep(ctx->reset_gpio, 1);

	usleep_range(5000, 6000);

	gpiod_set_value_cansleep(ctx->reset_gpio, 0);

	msleep(20);



	ret = ctx->panel_desc->init(ctx);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d\n",

			      ret);

		goto disable_iovcc;

	}



	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev, "Failed to exit sleep mode: %d\n", ret);

		goto disable_iovcc;

	}



	/* T9: 120ms */

	msleep(120);



	ret = mipi_dsi_dcs_set_display_on(dsi);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev, "Failed to set display on: %d\n", ret);

		goto disable_iovcc;

	}



	msleep(50);



	ctx->prepared = true;



	return 0;



disable_iovcc:

	regulator_disable(ctx->iovcc);

disable_vci:

	regulator_disable(ctx->vci);

	return ret;

}



static int ltk050h3146w_get_modes(struct drm_panel *panel,

				  struct drm_connector *connector)

{

	struct ltk050h3146w *ctx = panel_to_ltk050h3146w(panel);

	struct drm_display_mode *mode;



	mode = drm_mode_duplicate(connector->dev, ctx->panel_desc->mode);

	if (!mode)

		return -ENOMEM;



	drm_mode_set_name(mode);



	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;

	connector->display_info.width_mm = mode->width_mm;

	connector->display_info.height_mm = mode->height_mm;

	drm_mode_probed_add(connector, mode);



	return 1;

}



static const struct drm_panel_funcs ltk050h3146w_funcs = {

	.unprepare	= ltk050h3146w_unprepare,

	.prepare	= ltk050h3146w_prepare,

	.get_modes	= ltk050h3146w_get_modes,

};



static int ltk050h3146w_probe(struct mipi_dsi_device *dsi)

{

	struct device *dev = &dsi->dev;

	struct ltk050h3146w *ctx;

	int ret;



	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);

	if (!ctx)

		return -ENOMEM;



	ctx->panel_desc = of_device_get_match_data(dev);

	if (!ctx->panel_desc)

		return -EINVAL;



	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);

	if (IS_ERR(ctx->reset_gpio)) {

		DRM_DEV_ERROR(dev, "cannot get reset gpio\n");

		return PTR_ERR(ctx->reset_gpio);

	}



	ctx->vci = devm_regulator_get(dev, "vci");

	if (IS_ERR(ctx->vci)) {

		ret = PTR_ERR(ctx->vci);

		if (ret != -EPROBE_DEFER)

			DRM_DEV_ERROR(dev,

				      "Failed to request vci regulator: %d\n",

				      ret);

		return ret;

	}



	ctx->iovcc = devm_regulator_get(dev, "iovcc");

	if (IS_ERR(ctx->iovcc)) {

		ret = PTR_ERR(ctx->iovcc);

		if (ret != -EPROBE_DEFER)

			DRM_DEV_ERROR(dev,

				      "Failed to request iovcc regulator: %d\n",

				      ret);

		return ret;

	}



	mipi_dsi_set_drvdata(dsi, ctx);



	ctx->dev = dev;



	dsi->lanes = 4;

	dsi->format = MIPI_DSI_FMT_RGB888;

	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |

			  MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET;



	drm_panel_init(&ctx->panel, &dsi->dev, &ltk050h3146w_funcs,

		       DRM_MODE_CONNECTOR_DSI);



	ret = drm_panel_of_backlight(&ctx->panel);

	if (ret)

		return ret;



	drm_panel_add(&ctx->panel);



	ret = mipi_dsi_attach(dsi);

	if (ret < 0) {

		DRM_DEV_ERROR(dev, "mipi_dsi_attach failed: %d\n", ret);

		drm_panel_remove(&ctx->panel);

		return ret;

	}



	return 0;

}



static void ltk050h3146w_shutdown(struct mipi_dsi_device *dsi)

{

	struct ltk050h3146w *ctx = mipi_dsi_get_drvdata(dsi);

	int ret;



	ret = drm_panel_unprepare(&ctx->panel);

	if (ret < 0)

		DRM_DEV_ERROR(&dsi->dev, "Failed to unprepare panel: %d\n",

			      ret);



	ret = drm_panel_disable(&ctx->panel);

	if (ret < 0)

		DRM_DEV_ERROR(&dsi->dev, "Failed to disable panel: %d\n",

			      ret);

}



static int ltk050h3146w_remove(struct mipi_dsi_device *dsi)

{

	struct ltk050h3146w *ctx = mipi_dsi_get_drvdata(dsi);

	int ret;



	ltk050h3146w_shutdown(dsi);



	ret = mipi_dsi_detach(dsi);

	if (ret < 0)

		DRM_DEV_ERROR(&dsi->dev, "Failed to detach from DSI host: %d\n",

			      ret);



	drm_panel_remove(&ctx->panel);



	return 0;

}



static const struct of_device_id ltk050h3146w_of_match[] = {

	{

		.compatible = "leadtek,ltk050h3146w",

		.data = &ltk050h3146w_data,

	},

	{

		.compatible = "leadtek,ltk050h3146w-a2",

		.data = &ltk050h3146w_a2_data,

	},

	{ /* sentinel */ }

};

MODULE_DEVICE_TABLE(of, ltk050h3146w_of_match);



static struct mipi_dsi_driver ltk050h3146w_driver = {

	.driver = {

		.name = "panel-leadtek-ltk050h3146w",

		.of_match_table = ltk050h3146w_of_match,

	},

	.probe	= ltk050h3146w_probe,

	.remove = ltk050h3146w_remove,

	.shutdown = ltk050h3146w_shutdown,

};

module_mipi_dsi_driver(ltk050h3146w_driver);



MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");

MODULE_DESCRIPTION("DRM driver for Leadtek LTK050H3146W MIPI DSI panel");

MODULE_LICENSE("GPL v2");

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