video: hx8394: Add panel driver for hannstar,hsd060bhw4

The driver is for panels based on the Himax HX8394 controller, such as the
HannStar HSD060BHW4 720x1440 TFT LCD panel that uses a MIPI-DSI interface.
This panel is used in Pinephone Pro.

Signed-off-by: Ondrej Jirman <megi@xff.cz>
Cc: Anatolij Gustschin <agust@denx.de>

3 files changed, 246 insertions, 0 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 49762950719..b209cb71697 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -477,6 +477,14 @@ config VIDEO_LCD_ENDEAVORU
 	  using the same DSI command sequence. The panel has a 720x1280
 	  resolution and uses 24 bit RGB per pixel.
 
+config VIDEO_LCD_HIMAX_HX8394
+	bool "Himax HX8394 DSI LCD panel support"
+	depends on PANEL && BACKLIGHT
+	select VIDEO_MIPI_DSI
+	help
+	Say Y here if you want to enable support for Himax HX8394
+	dsi 4dl panel.
+
 config VIDEO_LCD_ORISETECH_OTM8009A
 	bool "OTM8009A DSI LCD panel support"
 	select VIDEO_MIPI_DSI
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index f99d7e3c3d9..d710c1f2efb 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_VIDEO_IPUV3) += imx/
 obj-$(CONFIG_VIDEO_IVYBRIDGE_IGD) += ivybridge_igd.o
 obj-$(CONFIG_VIDEO_LCD_ANX9804) += anx9804.o
 obj-$(CONFIG_VIDEO_LCD_ENDEAVORU) += endeavoru-panel.o
+obj-$(CONFIG_VIDEO_LCD_HIMAX_HX8394) += himax-hx8394.o
 obj-$(CONFIG_VIDEO_LCD_HITACHI_TX18D42VM) += hitachi_tx18d42vm_lcd.o
 obj-$(CONFIG_VIDEO_LCD_ORISETECH_OTM8009A) += orisetech_otm8009a.o
 obj-$(CONFIG_VIDEO_LCD_RAYDIUM_RM68200) += raydium-rm68200.o
diff --git a/drivers/video/himax-hx8394.c b/drivers/video/himax-hx8394.c
new file mode 100644
index 00000000000..63637b4db02
--- /dev/null
+++ b/drivers/video/himax-hx8394.c
@@ -0,0 +1,237 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022 Ondrej Jirman <megi@xff.cz>
+ */
+#include <common.h>
+#include <backlight.h>
+#include <dm.h>
+#include <mipi_dsi.h>
+#include <panel.h>
+#include <asm/gpio.h>
+#include <dm/device_compat.h>
+#include <linux/delay.h>
+#include <power/regulator.h>
+
+struct hx8394_panel_priv {
+	struct udevice *reg_vcc;
+	struct udevice *reg_iovcc;
+	struct gpio_desc reset;
+	struct udevice *backlight;
+};
+
+static const struct display_timing default_timing = {
+	.pixelclock.typ		= 74250000,
+	.hactive.typ		= 720,
+	.hfront_porch.typ	= 40,
+	.hback_porch.typ	= 40,
+	.hsync_len.typ		= 46,
+	.vactive.typ		= 1440,
+	.vfront_porch.typ	= 7,
+	.vback_porch.typ	= 9,
+	.vsync_len.typ		= 7,
+	.flags			= DISPLAY_FLAGS_VSYNC_LOW | DISPLAY_FLAGS_HSYNC_LOW,
+};
+
+#define dsi_dcs_write_seq(device, seq...) do {					\
+		static const u8 d[] = { seq };					\
+		int ret;							\
+		ret = mipi_dsi_dcs_write_buffer(device, d, ARRAY_SIZE(d));	\
+		if (ret < 0)							\
+			return ret;						\
+	} while (0)
+
+static int hx8394_init_sequence(struct udevice *dev)
+{
+	struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+	struct mipi_dsi_device *device = plat->device;
+	int ret;
+
+	dsi_dcs_write_seq(device, 0xb9, 0xff, 0x83, 0x94);
+	dsi_dcs_write_seq(device, 0xb1, 0x48, 0x11, 0x71, 0x09, 0x32, 0x24,
+			  0x71, 0x31, 0x55, 0x30);
+	dsi_dcs_write_seq(device, 0xba, 0x63, 0x03, 0x68, 0x6b, 0xb2, 0xc0);
+	dsi_dcs_write_seq(device, 0xb2, 0x00, 0x80, 0x78, 0x0c, 0x07);
+	dsi_dcs_write_seq(device, 0xb4, 0x12, 0x63, 0x12, 0x63, 0x12, 0x63,
+			  0x01, 0x0c, 0x7c, 0x55, 0x00, 0x3f, 0x12, 0x6b, 0x12,
+			  0x6b, 0x12, 0x6b, 0x01, 0x0c, 0x7c);
+	dsi_dcs_write_seq(device, 0xd3, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x1c,
+			  0x00, 0x00, 0x32, 0x10, 0x09, 0x00, 0x09, 0x32, 0x15,
+			  0xad, 0x05, 0xad, 0x32, 0x00, 0x00, 0x00, 0x00, 0x37,
+			  0x03, 0x0b, 0x0b, 0x37, 0x00, 0x00, 0x00, 0x0c, 0x40);
+	dsi_dcs_write_seq(device, 0xd5, 0x19, 0x19, 0x18, 0x18, 0x1b, 0x1b,
+			  0x1a, 0x1a, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+			  0x07, 0x20, 0x21, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			  0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x24, 0x25, 0x18,
+			  0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			  0x18, 0x18);
+	dsi_dcs_write_seq(device, 0xd6, 0x18, 0x18, 0x19, 0x19, 0x1b, 0x1b,
+			  0x1a, 0x1a, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01,
+			  0x00, 0x25, 0x24, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			  0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x21, 0x20, 0x18,
+			  0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			  0x18, 0x18);
+	dsi_dcs_write_seq(device, 0xe0, 0x00, 0x04, 0x0c, 0x12, 0x14, 0x18,
+			  0x1a, 0x18, 0x31, 0x3f, 0x4d, 0x4c, 0x54, 0x65, 0x6b,
+			  0x70, 0x7f, 0x82, 0x7e, 0x8a, 0x99, 0x4a, 0x48, 0x49,
+			  0x4b, 0x4a, 0x4c, 0x4b, 0x7f, 0x00, 0x04, 0x0c, 0x11,
+			  0x13, 0x17, 0x1a, 0x18, 0x31, 0x3f, 0x4d, 0x4c, 0x54,
+			  0x65, 0x6b, 0x70, 0x7f, 0x82, 0x7e, 0x8a, 0x99, 0x4a,
+			  0x48, 0x49, 0x4b, 0x4a, 0x4c, 0x4b, 0x7f);
+	dsi_dcs_write_seq(device, 0xcc, 0x0b);
+	dsi_dcs_write_seq(device, 0xc0, 0x1f, 0x31);
+	dsi_dcs_write_seq(device, 0xb6, 0x7d, 0x7d);
+	dsi_dcs_write_seq(device, 0xd4, 0x02);
+	dsi_dcs_write_seq(device, 0xbd, 0x01);
+	dsi_dcs_write_seq(device, 0xb1, 0x00);
+	dsi_dcs_write_seq(device, 0xbd, 0x00);
+	dsi_dcs_write_seq(device, 0xc6, 0xed);
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(device);
+	if (ret)
+		return ret;
+
+	/* Panel is operational 120 msec after reset */
+	mdelay(120);
+
+	ret = mipi_dsi_dcs_set_display_on(device);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int hx8394_panel_enable_backlight(struct udevice *dev)
+{
+	struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+	struct mipi_dsi_device *device = plat->device;
+	struct hx8394_panel_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = mipi_dsi_attach(device);
+	if (ret < 0) {
+		printf("mipi_dsi_attach failed %d\n", ret);
+		return ret;
+	}
+
+	ret = hx8394_init_sequence(dev);
+	if (ret) {
+		printf("hx8394_init_sequence failed %d\n", ret);
+		return ret;
+	}
+
+	if (priv->backlight) {
+		ret = backlight_enable(priv->backlight);
+		if (ret) {
+			printf("backlight enabled failed %d\n", ret);
+			return ret;
+		}
+
+		backlight_set_brightness(priv->backlight, 60);
+	}
+
+	mdelay(10);
+
+	return 0;
+}
+
+static int hx8394_panel_get_display_timing(struct udevice *dev,
+					   struct display_timing *timings)
+{
+	memcpy(timings, &default_timing, sizeof(*timings));
+
+	return 0;
+}
+
+static int hx8394_panel_of_to_plat(struct udevice *dev)
+{
+	struct hx8394_panel_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	if (CONFIG_IS_ENABLED(DM_REGULATOR)) {
+		ret =  device_get_supply_regulator(dev, "vcc-supply",
+						   &priv->reg_vcc);
+		if (ret && ret != -ENOENT) {
+			dev_err(dev, "Warning: cannot get vcc supply\n");
+			return ret;
+		}
+
+		ret =  device_get_supply_regulator(dev, "iovcc-supply",
+						   &priv->reg_iovcc);
+		if (ret && ret != -ENOENT) {
+			dev_err(dev, "Warning: cannot get iovcc supply\n");
+			return ret;
+		}
+	}
+
+	ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
+					   "backlight", &priv->backlight);
+	if (ret)
+		dev_warn(dev, "failed to get backlight\n");
+
+	ret = gpio_request_by_name(dev, "reset-gpios", 0, &priv->reset,
+				   GPIOD_IS_OUT);
+	if (ret) {
+		dev_err(dev, "warning: cannot get reset GPIO (%d)\n", ret);
+		if (ret != -ENOENT)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int hx8394_panel_probe(struct udevice *dev)
+{
+	struct hx8394_panel_priv *priv = dev_get_priv(dev);
+	struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+	int ret;
+
+	dm_gpio_set_value(&priv->reset, true);
+
+	if (CONFIG_IS_ENABLED(DM_REGULATOR)) {
+		dev_dbg(dev, "enable vcc '%s'\n", priv->reg_vcc->name);
+		ret = regulator_set_enable(priv->reg_vcc, true);
+		if (ret)
+			return ret;
+
+		dev_dbg(dev, "enable iovcc '%s'\n", priv->reg_iovcc->name);
+		ret = regulator_set_enable(priv->reg_iovcc, true);
+		if (ret) {
+			regulator_set_enable(priv->reg_vcc, false);
+			return ret;
+		}
+	}
+
+	mdelay(5);
+	dm_gpio_set_value(&priv->reset, false);
+
+	mdelay(180);
+
+	/* fill characteristics of DSI data link */
+	plat->lanes = 4;
+	plat->format = MIPI_DSI_FMT_RGB888;
+	plat->mode_flags = MIPI_DSI_MODE_VIDEO |
+			   MIPI_DSI_MODE_VIDEO_BURST;
+
+	return 0;
+}
+
+static const struct panel_ops hx8394_panel_ops = {
+	.enable_backlight = hx8394_panel_enable_backlight,
+	.get_display_timing = hx8394_panel_get_display_timing,
+};
+
+static const struct udevice_id hx8394_panel_ids[] = {
+	{ .compatible = "hannstar,hsd060bhw4" },
+	{ }
+};
+
+U_BOOT_DRIVER(hx8394_panel) = {
+	.name		= "hx8394_panel",
+	.id		= UCLASS_PANEL,
+	.of_match	= hx8394_panel_ids,
+	.ops		= &hx8394_panel_ops,
+	.of_to_plat	= hx8394_panel_of_to_plat,
+	.probe		= hx8394_panel_probe,
+	.plat_auto	= sizeof(struct mipi_dsi_panel_plat),
+	.priv_auto	= sizeof(struct hx8394_panel_priv),
+};