video: panel: add LG LH400WV3-SD04 MIPI DSI panel driver

LG LH400WV3-SD04 is a color active matrix TFT (Thin Film Transistor)
liquid crystal display (LCD). The resolution of a 4" contains 480 x 800
pixels.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

drivers/video/Kconfig

@@ -581,6 +581,14 @@ config VIDEO_LCD_LG_LD070WX3
 	  Say Y here if you want to enable support for LG LD070WX3
 	  800x1280 DSI video mode panel.
 
+config VIDEO_LCD_LG_LH400WV3
+	bool "LH400WV3-SD04 DSI LCD panel support"
+	depends on PANEL && BACKLIGHT
+	select VIDEO_MIPI_DSI
+	help
+	  Say Y here if you want to enable support for LG LH400WV3
+	  480x800 DSI video mode panel.
+
 config VIDEO_LCD_RAYDIUM_RM68200
 	bool "RM68200 DSI LCD panel support"
 	select VIDEO_MIPI_DSI

drivers/video/Makefile

@@ -61,6 +61,7 @@ obj-$(CONFIG_VIDEO_LCD_HIMAX_HX8394) += himax-hx8394.o
 obj-$(CONFIG_VIDEO_LCD_HITACHI_TX10D07VM0BAA) += hitachi-tx10d07vm0baa.o
 obj-$(CONFIG_VIDEO_LCD_HITACHI_TX18D42VM) += hitachi_tx18d42vm_lcd.o
 obj-$(CONFIG_VIDEO_LCD_LG_LD070WX3) += lg-ld070wx3.o
+obj-$(CONFIG_VIDEO_LCD_LG_LH400WV3) += lg-lh400wv3-sd04.o
 obj-$(CONFIG_VIDEO_LCD_MOT) += mot-panel.o
 obj-$(CONFIG_VIDEO_LCD_NOVATEK_NT35510) += novatek-nt35510.o
 obj-$(CONFIG_VIDEO_LCD_ORISETECH_OTM8009A) += orisetech_otm8009a.o

drivers/video/lg-lh400wv3-sd04.c

@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * LG LH400WV3-SD04 DSI panel driver
+ *
+ * Copyright (c) 2025 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <backlight.h>
+#include <dm.h>
+#include <panel.h>
+#include <log.h>
+#include <mipi_dsi.h>
+#include <linux/delay.h>
+#include <power/regulator.h>
+#include <asm/gpio.h>
+
+struct lg_lh400wv3_priv {
+	struct udevice *avci;
+	struct udevice *iovcc;
+
+	struct udevice *backlight;
+
+	struct gpio_desc reset_gpio;
+};
+
+static struct display_timing default_timing = {
+	.pixelclock.typ		= 29816000,
+	.hactive.typ		= 480,
+	.hfront_porch.typ	= 10,
+	.hback_porch.typ	= 10,
+	.hsync_len.typ		= 10,
+	.vactive.typ		= 800,
+	.vfront_porch.typ	= 4,
+	.vback_porch.typ	= 4,
+	.vsync_len.typ		= 4,
+};
+
+#define dsi_generic_write_seq(dsi, cmd, seq...) do {			\
+		static const u8 b[] = { cmd, seq };			\
+		int ret;						\
+		ret = mipi_dsi_dcs_write_buffer(dsi, b, ARRAY_SIZE(b));	\
+		if (ret < 0)						\
+			return ret;					\
+	} while (0)
+
+static int lg_lh400wv3_enable_backlight(struct udevice *dev)
+{
+	struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+	struct mipi_dsi_device *dsi = plat->device;
+	int ret;
+
+	dsi_generic_write_seq(dsi, MIPI_DCS_EXIT_INVERT_MODE);
+	dsi_generic_write_seq(dsi, MIPI_DCS_SET_TEAR_ON);
+
+	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT |
+					    MIPI_DCS_PIXEL_FMT_24BIT << 4);
+	if (ret < 0) {
+		log_debug("%s: failed to set pixel format: %d\n", __func__, ret);
+		return ret;
+	}
+
+	dsi_generic_write_seq(dsi, 0xb2, 0x00, 0xc8);
+	dsi_generic_write_seq(dsi, 0xb3, 0x00);
+	dsi_generic_write_seq(dsi, 0xb4, 0x04);
+	dsi_generic_write_seq(dsi, 0xb5, 0x42, 0x10, 0x10, 0x00, 0x20);
+	dsi_generic_write_seq(dsi, 0xb6, 0x0b, 0x0f, 0x3c, 0x13, 0x13, 0xe8);
+	dsi_generic_write_seq(dsi, 0xb7, 0x4c, 0x06, 0x0c, 0x00, 0x00);
+
+	dsi_generic_write_seq(dsi, 0xc0, 0x01, 0x11);
+	dsi_generic_write_seq(dsi, 0xc3, 0x07, 0x03, 0x04, 0x04, 0x04);
+	dsi_generic_write_seq(dsi, 0xc4, 0x12, 0x24, 0x18, 0x18, 0x02, 0x49);
+	dsi_generic_write_seq(dsi, 0xc5, 0x65);
+	dsi_generic_write_seq(dsi, 0xc6, 0x41, 0x63);
+
+	dsi_generic_write_seq(dsi, 0xd0, 0x00, 0x46, 0x74, 0x32, 0x1d, 0x03, 0x51, 0x15, 0x04);
+	dsi_generic_write_seq(dsi, 0xd1, 0x00, 0x46, 0x74, 0x32, 0x1d, 0x03, 0x51, 0x15, 0x04);
+	dsi_generic_write_seq(dsi, 0xd2, 0x00, 0x46, 0x74, 0x32, 0x1f, 0x03, 0x51, 0x15, 0x04);
+	dsi_generic_write_seq(dsi, 0xd3, 0x00, 0x46, 0x74, 0x32, 0x1f, 0x03, 0x51, 0x15, 0x04);
+	dsi_generic_write_seq(dsi, 0xd4, 0x01, 0x46, 0x74, 0x25, 0x00, 0x03, 0x51, 0x15, 0x04);
+	dsi_generic_write_seq(dsi, 0xd5, 0x01, 0x46, 0x74, 0x25, 0x00, 0x03, 0x51, 0x15, 0x04);
+
+	dsi_generic_write_seq(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, 0x00, 0x00, 0x01, 0xdf);
+	dsi_generic_write_seq(dsi, MIPI_DCS_SET_PAGE_ADDRESS, 0x00, 0x00, 0x03, 0x1f);
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0) {
+		log_debug("%s: failed to exit sleep mode: %d\n", __func__, ret);
+		return ret;
+	}
+
+	mdelay(120);
+
+	dsi_generic_write_seq(dsi, MIPI_DCS_WRITE_MEMORY_START);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		log_debug("%s: failed to set display on: %d\n", __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int lg_lh400wv3_set_backlight(struct udevice *dev, int percent)
+{
+	struct lg_lh400wv3_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = backlight_enable(priv->backlight);
+	if (ret)
+		return ret;
+
+	return backlight_set_brightness(priv->backlight, percent);
+}
+
+static int lg_lh400wv3_timings(struct udevice *dev, struct display_timing *timing)
+{
+	memcpy(timing, &default_timing, sizeof(*timing));
+	return 0;
+}
+
+static int lg_lh400wv3_of_to_plat(struct udevice *dev)
+{
+	struct lg_lh400wv3_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
+					   "backlight", &priv->backlight);
+	if (ret) {
+		log_debug("%s: cannot get backlight: ret = %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	ret = device_get_supply_regulator(dev, "avci-supply", &priv->avci);
+	if (ret) {
+		log_debug("%s: cannot get avci-supply: ret = %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	ret = device_get_supply_regulator(dev, "iovcc-supply", &priv->iovcc);
+	if (ret) {
+		log_debug("%s: cannot get iovcc-supply: ret = %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	ret = gpio_request_by_name(dev, "reset-gpios", 0,
+				   &priv->reset_gpio, GPIOD_IS_OUT);
+	if (ret) {
+		log_debug("%s: cannot decode reset-gpios (%d)\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int lg_lh400wv3_hw_init(struct udevice *dev)
+{
+	struct lg_lh400wv3_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = dm_gpio_set_value(&priv->reset_gpio, 1);
+	if (ret) {
+		log_debug("%s: error entering reset (%d)\n", __func__, ret);
+		return ret;
+	}
+
+	ret = regulator_set_enable_if_allowed(priv->iovcc, 1);
+	if (ret) {
+		log_debug("%s: enabling iovcc-supply failed (%d)\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	ret = regulator_set_enable_if_allowed(priv->avci, 1);
+	if (ret) {
+		log_debug("%s: enabling avci-supply failed (%d)\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	mdelay(1);
+
+	ret = dm_gpio_set_value(&priv->reset_gpio, 0);
+	if (ret) {
+		log_debug("%s: error exiting reset (%d)\n", __func__, ret);
+		return ret;
+	}
+
+	mdelay(10);
+
+	return 0;
+}
+
+static int lg_lh400wv3_probe(struct udevice *dev)
+{
+	struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+
+	/* fill characteristics of DSI data link */
+	plat->lanes = 2;
+	plat->format = MIPI_DSI_FMT_RGB888;
+	plat->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM;
+
+	return lg_lh400wv3_hw_init(dev);
+}
+
+static const struct panel_ops lg_lh400wv3_ops = {
+	.enable_backlight	= lg_lh400wv3_enable_backlight,
+	.set_backlight		= lg_lh400wv3_set_backlight,
+	.get_display_timing	= lg_lh400wv3_timings,
+};
+
+static const struct udevice_id lg_lh400wv3_ids[] = {
+	{ .compatible = "lg,lh400wv3-sd04" },
+	{ }
+};
+
+U_BOOT_DRIVER(lg_lh400wv3) = {
+	.name		= "lg_lh400wv3",
+	.id		= UCLASS_PANEL,
+	.of_match	= lg_lh400wv3_ids,
+	.ops		= &lg_lh400wv3_ops,
+	.of_to_plat	= lg_lh400wv3_of_to_plat,
+	.probe		= lg_lh400wv3_probe,
+	.plat_auto	= sizeof(struct mipi_dsi_panel_plat),
+	.priv_auto	= sizeof(struct lg_lh400wv3_priv),
+};