[PATCH v2 2/7] video: panel: add Samsung LTL106HL02 MIPI DSI panel driver

[Svyatoslav Ryhel <clamor95@gmail.com>]

From: Anton Bambura <jenneron@protonmail.com>

LTL106HL02 is a color active matrix TFT (Thin Film Transistor)
liquid crystal display (LCD) that uses amorphous silicon TFT as
switching devices. This model is composed of a TFT LCD panel, a
driver circuit and a backlight unit. The resolution of a 10.6"
contains 1920 x 1080 pixels and can display up to 16,8M color
with wide viewing angle.

Co-developed-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Signed-off-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Anton Bambura <jenneron@protonmail.com>
---
 drivers/video/Kconfig              |   9 ++
 drivers/video/Makefile             |   1 +
 drivers/video/samsung-ltl106hl02.c | 157 +++++++++++++++++++++++++++++
 3 files changed, 167 insertions(+)
 create mode 100644 drivers/video/samsung-ltl106hl02.c

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 05567a0095..52b515197d 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -555,6 +555,15 @@ config VIDEO_LCD_RENESAS_R69328
 	  IPS-LCD module with Renesas R69328 IC. The panel has a 720x1280
 	  resolution and uses 24 bit RGB per pixel.
 
+config VIDEO_LCD_SAMSUNG_LTL106HL02
+	tristate "Samsung LTL106HL02 1920x1080 DSI video mode panel"
+	depends on PANEL && BACKLIGHT
+	select VIDEO_MIPI_DSI
+	help
+	  Say Y here if you want to enable support for Samsung LTL106HL02
+	  LCD module found in Microsoft Surface 2. The panel has a FullHD
+	  resolution (1920x1080).
+
 config VIDEO_LCD_SSD2828
 	bool "SSD2828 bridge chip"
 	---help---
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index bb6d9b74b9..f3f70cd04a 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_LCD_ORISETECH_OTM8009A) += orisetech_otm8009a.o
 obj-$(CONFIG_VIDEO_LCD_RAYDIUM_RM68200) += raydium-rm68200.o
 obj-$(CONFIG_VIDEO_LCD_RENESAS_R61307) += renesas-r61307.o
 obj-$(CONFIG_VIDEO_LCD_RENESAS_R69328) += renesas-r69328.o
+obj-$(CONFIG_VIDEO_LCD_SAMSUNG_LTL106HL02) += samsung-ltl106hl02.o
 obj-$(CONFIG_VIDEO_LCD_SSD2828) += ssd2828.o
 obj-$(CONFIG_VIDEO_LCD_TDO_TL070WSH30) += tdo-tl070wsh30.o
 obj-$(CONFIG_VIDEO_MCDE_SIMPLE) += mcde_simple.o
diff --git a/drivers/video/samsung-ltl106hl02.c b/drivers/video/samsung-ltl106hl02.c
new file mode 100644
index 0000000000..5e6c11c4be
--- /dev/null
+++ b/drivers/video/samsung-ltl106hl02.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Samsung LTL106HL02-001 DSI panel driver
+ *
+ * Copyright (c) 2020 Anton Bambura <jenneron@protonmail.com>
+ * Copyright (c) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+ * Copyright (c) 2024 Jonas Schwöbel <jonasschwoebel@yahoo.de>
+ */
+
+#include <backlight.h>
+#include <dm.h>
+#include <panel.h>
+#include <log.h>
+#include <mipi_dsi.h>
+#include <asm/gpio.h>
+#include <linux/delay.h>
+#include <power/regulator.h>
+
+struct samsung_ltl106hl02_priv {
+	struct udevice *vdd;
+	struct udevice *backlight;
+
+	struct gpio_desc reset_gpio;
+};
+
+static struct display_timing default_timing = {
+	.pixelclock.typ		= 137000000,
+	.hactive.typ		= 1920,
+	.hfront_porch.typ	= 32,
+	.hback_porch.typ	= 64,
+	.hsync_len.typ		= 32,
+	.vactive.typ		= 1080,
+	.vfront_porch.typ	= 2,
+	.vback_porch.typ	= 26,
+	.vsync_len.typ		= 3,
+};
+
+static int samsung_ltl106hl02_enable_backlight(struct udevice *dev)
+{
+	struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+	struct mipi_dsi_device *dsi = plat->device;
+	int ret;
+
+	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(70);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		log_debug("%s: failed to enable display: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+	mdelay(5);
+
+	return 0;
+}
+
+static int samsung_ltl106hl02_set_backlight(struct udevice *dev, int percent)
+{
+	struct samsung_ltl106hl02_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 samsung_ltl106hl02_timings(struct udevice *dev,
+				      struct display_timing *timing)
+{
+	memcpy(timing, &default_timing, sizeof(*timing));
+	return 0;
+}
+
+static int samsung_ltl106hl02_of_to_plat(struct udevice *dev)
+{
+	struct samsung_ltl106hl02_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 = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
+					   "vdd-supply", &priv->vdd);
+	if (ret)
+		log_debug("%s: cannot get vdd-supply: error %d\n",
+			  __func__, ret);
+
+	ret = gpio_request_by_name(dev, "reset-gpios", 0,
+				   &priv->reset_gpio, GPIOD_IS_OUT);
+	if (ret)
+		log_debug("%s: cannot get reset-gpios: error %d\n",
+			  __func__, ret);
+
+	return 0;
+}
+
+static int samsung_ltl106hl02_hw_init(struct udevice *dev)
+{
+	struct samsung_ltl106hl02_priv *priv = dev_get_priv(dev);
+
+	dm_gpio_set_value(&priv->reset_gpio, 1);
+	regulator_set_enable_if_allowed(priv->vdd, 1);
+
+	/* Dataheets states at least 8.5 msec for vdd stabilization */
+	mdelay(10);
+
+	dm_gpio_set_value(&priv->reset_gpio, 0);
+
+	return 0;
+}
+
+static int samsung_ltl106hl02_probe(struct udevice *dev)
+{
+	struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+
+	/* fill characteristics of DSI data link */
+	plat->lanes = 4;
+	plat->format = MIPI_DSI_FMT_RGB888;
+	plat->mode_flags = MIPI_DSI_MODE_VIDEO;
+
+	return samsung_ltl106hl02_hw_init(dev);
+}
+
+static const struct panel_ops samsung_ltl106hl02_ops = {
+	.enable_backlight	= samsung_ltl106hl02_enable_backlight,
+	.set_backlight		= samsung_ltl106hl02_set_backlight,
+	.get_display_timing	= samsung_ltl106hl02_timings,
+};
+
+static const struct udevice_id samsung_ltl106hl02_ids[] = {
+	{ .compatible = "samsung,ltl106hl02-001" },
+	{ }
+};
+
+U_BOOT_DRIVER(samsung_ltl106hl02) = {
+	.name		= "samsung_ltl106hl02",
+	.id		= UCLASS_PANEL,
+	.of_match	= samsung_ltl106hl02_ids,
+	.ops		= &samsung_ltl106hl02_ops,
+	.of_to_plat	= samsung_ltl106hl02_of_to_plat,
+	.probe		= samsung_ltl106hl02_probe,
+	.plat_auto	= sizeof(struct mipi_dsi_panel_plat),
+	.priv_auto	= sizeof(struct samsung_ltl106hl02_priv),
+};
-- 
2.40.1