video: panel: add Sharp LQ101R1SX01 MIPI DSI panel driver

This module is a color active matrix LCD module incorporating
Oxide TFT (Thin Film Transistor). It is composed of a color TFT-LCD
panel, driver ICs, a control circuit and power supply circuit, and
a backlight unit. Graphics and texts can be displayed on a 2560×1600
dots panel with (16,777,216) colors by using MIPI DUAL DSI interface,
supplying +3.3V DC supply voltage for TFT-LCD panel driving and
supplying DC supply voltage for LED Backlight.

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

drivers/video/Kconfig

@@ -599,6 +599,15 @@ config VIDEO_LCD_SAMSUNG_LTL106HL02
 	  LCD module found in Microsoft Surface 2. The panel has a FullHD
 	  resolution (1920x1080).
 
+config VIDEO_LCD_SHARP_LQ101R1SX01
+	tristate "Sharp LQ101R1SX01 2560x1600 DSI video mode panel"
+	depends on PANEL && BACKLIGHT
+	select VIDEO_MIPI_DSI
+	help
+	  Say Y here if you want to enable support for Sharp LQ101R1SX01
+	  LCD module found in ASUS Transformer TF701T. The panel has a
+	  WQXGA resolution (2560x1600).
+
 config VIDEO_LCD_SSD2828
 	bool "SSD2828 bridge chip"
 	---help---

drivers/video/Makefile

@@ -64,6 +64,7 @@ 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-$(CONFIG_VIDEO_LCD_SHARP_LQ101R1SX01) += sharp-lq101r1sx01.o
 obj-$(CONFIG_VIDEO_LCD_SSD2828) += ssd2828.o
 obj-$(CONFIG_VIDEO_LCD_TDO_TL070WSH30) += tdo-tl070wsh30.o
 obj-$(CONFIG_VIDEO_MCDE_SIMPLE) += mcde_simple.o

drivers/video/sharp-lq101r1sx01.c

@@ -0,0 +1,282 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Sharp LQ101R1SX01 DSI panel driver
+ *
+ * Copyright (C) 2014 NVIDIA Corporation
+ * Copyright (c) 2023 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>
+
+struct sharp_lq101r1sx01_priv {
+	struct udevice *backlight;
+	struct udevice *panel_sec;
+	struct udevice *vcc;
+};
+
+static struct display_timing default_timing = {
+	.pixelclock.typ		= 278000000,
+	.hactive.typ		= 2560,
+	.hfront_porch.typ	= 128,
+	.hback_porch.typ	= 64,
+	.hsync_len.typ		= 64,
+	.vactive.typ		= 1600,
+	.vfront_porch.typ	= 4,
+	.vback_porch.typ	= 8,
+	.vsync_len.typ		= 32,
+};
+
+static int sharp_lq101r1sx01_write(struct mipi_dsi_device *dsi,
+				   u16 offset, u8 value)
+{
+	u8 payload[3] = { offset >> 8, offset & 0xff, value };
+	int ret;
+
+	ret = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
+	if (ret < 0) {
+		log_debug("%s: failed to write %02x to %04x: %zd\n",
+			  __func__, value, offset, ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_nop(dsi);
+	if (ret < 0) {
+		log_debug("%s: failed to send DCS nop: %zd\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	udelay(20);
+
+	return 0;
+}
+
+static int sharp_setup_symmetrical_split(struct mipi_dsi_device *left,
+					 struct mipi_dsi_device *right,
+					 struct display_timing *timing)
+{
+	int ret;
+
+	ret = mipi_dsi_dcs_set_column_address(left, 0,
+					      timing->hactive.typ / 2 - 1);
+	if (ret < 0) {
+		log_debug("%s: failed to set column address: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_page_address(left, 0, timing->vactive.typ - 1);
+	if (ret < 0) {
+		log_debug("%s: failed to set page address: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_column_address(right, timing->hactive.typ / 2,
+					      timing->hactive.typ - 1);
+	if (ret < 0) {
+		log_debug("%s: failed to set column address: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_page_address(right, 0, timing->vactive.typ - 1);
+	if (ret < 0) {
+		log_debug("%s: failed to set page address: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int sharp_lq101r1sx01_enable_backlight(struct udevice *dev)
+{
+	struct sharp_lq101r1sx01_priv *priv = dev_get_priv(dev);
+
+	if (!priv->panel_sec)
+		return 0;
+
+	struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+	struct mipi_dsi_panel_plat *plat_sec = dev_get_plat(priv->panel_sec);
+	struct mipi_dsi_device *link1 = plat->device;
+	struct mipi_dsi_device *link2 = plat_sec->device;
+	int ret;
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(link1);
+	if (ret < 0) {
+		log_debug("%s: failed to exit sleep mode: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	/* set left-right mode */
+	ret = sharp_lq101r1sx01_write(link1, 0x1000, 0x2a);
+	if (ret < 0) {
+		log_debug("%s: failed to set left-right mode: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	/* enable command mode */
+	ret = sharp_lq101r1sx01_write(link1, 0x1001, 0x01);
+	if (ret < 0) {
+		log_debug("%s: failed to enable command mode: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_pixel_format(link1, MIPI_DCS_PIXEL_FMT_24BIT);
+	if (ret < 0) {
+		log_debug("%s: failed to set pixel format: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	/*
+	 * TODO: The device supports both left-right and even-odd split
+	 * configurations, but this driver currently supports only the left-
+	 * right split. To support a different mode a mechanism needs to be
+	 * put in place to communicate the configuration back to the DSI host
+	 * controller.
+	 */
+	ret = sharp_setup_symmetrical_split(link1, link2, &default_timing);
+	if (ret < 0) {
+		log_debug("%s: failed to set up symmetrical split: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_display_on(link1);
+	if (ret < 0) {
+		log_debug("%s: failed to set panel on: %d\n",
+			  __func__, ret);
+		return ret;
+	}
+	mdelay(20);
+
+	return 0;
+}
+
+static int sharp_lq101r1sx01_set_backlight(struct udevice *dev, int percent)
+{
+	struct sharp_lq101r1sx01_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	if (!priv->panel_sec)
+		return 0;
+
+	ret = backlight_enable(priv->backlight);
+	if (ret)
+		return ret;
+
+	return backlight_set_brightness(priv->backlight, percent);
+}
+
+static int sharp_lq101r1sx01_timings(struct udevice *dev,
+				     struct display_timing *timing)
+{
+	memcpy(timing, &default_timing, sizeof(*timing));
+	return 0;
+}
+
+static int sharp_lq101r1sx01_of_to_plat(struct udevice *dev)
+{
+	struct sharp_lq101r1sx01_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	/* If node has no link2 it is secondary panel */
+	if (!dev_read_bool(dev, "link2"))
+		return 0;
+
+	ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev,
+					   "link2", &priv->panel_sec);
+	if (ret) {
+		log_debug("%s: cannot get secondary panel: ret = %d\n",
+			  __func__, ret);
+		return 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,
+					   "power-supply", &priv->vcc);
+	if (ret) {
+		log_debug("%s: cannot get power-supply: ret = %d\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int sharp_lq101r1sx01_hw_init(struct udevice *dev)
+{
+	struct sharp_lq101r1sx01_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	if (!priv->panel_sec)
+		return 0;
+
+	ret = regulator_set_enable_if_allowed(priv->vcc, 1);
+	if (ret) {
+		log_debug("%s: enabling power-supply failed (%d)\n",
+			  __func__, ret);
+		return ret;
+	}
+
+	/*
+	 * According to the datasheet, the panel needs around 10 ms to fully
+	 * power up. At least another 120 ms is required before exiting sleep
+	 * mode to make sure the panel is ready. Throw in another 20 ms for
+	 * good measure.
+	 */
+	mdelay(150);
+
+	return 0;
+}
+
+static int sharp_lq101r1sx01_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;
+
+	return sharp_lq101r1sx01_hw_init(dev);
+}
+
+static const struct panel_ops sharp_lq101r1sx01_ops = {
+	.enable_backlight	= sharp_lq101r1sx01_enable_backlight,
+	.set_backlight		= sharp_lq101r1sx01_set_backlight,
+	.get_display_timing	= sharp_lq101r1sx01_timings,
+};
+
+static const struct udevice_id sharp_lq101r1sx01_ids[] = {
+	{ .compatible = "sharp,lq101r1sx01" },
+	{ }
+};
+
+U_BOOT_DRIVER(sharp_lq101r1sx01) = {
+	.name		= "sharp_lq101r1sx01",
+	.id		= UCLASS_PANEL,
+	.of_match	= sharp_lq101r1sx01_ids,
+	.ops		= &sharp_lq101r1sx01_ops,
+	.of_to_plat	= sharp_lq101r1sx01_of_to_plat,
+	.probe		= sharp_lq101r1sx01_probe,
+	.plat_auto	= sizeof(struct mipi_dsi_panel_plat),
+	.priv_auto	= sizeof(struct sharp_lq101r1sx01_priv),
+};