From a81b4fe69e7bd2667524182e76c635f04c1ead7e Mon Sep 17 00:00:00 2001
From: Chris Morgan <macromorgan@hotmail.com>
Date: Wed, 10 Jun 2026 09:44:05 -0500
Subject: [PATCH] drm/panel: anbernic-td4310: Add RG Vita Pro panel

The panel used by Anbernic in the RG Vita-Pro is a DSI panel based
on the TD4310 controller IC. It measures approximately 5.5 inches
diagonally and is 1080x1920 in resolution.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260610144407.438846-5-macroalpha82@gmail.com
---
 drivers/gpu/drm/panel/Kconfig                 |  10 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-anbernic-td4310.c | 257 ++++++++++++++++++
 3 files changed, 268 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-anbernic-td4310.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 7450b27622a2..3656bfab7712 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -17,6 +17,16 @@ config DRM_PANEL_ABT_Y030XX067A
 	  Y030XX067A 320x480 3.0" panel as found in the YLM RG-280M, RG-300
 	  and RG-99 handheld gaming consoles.
 
+config DRM_PANEL_ANBERNIC_TD4310
+	tristate "Anbernic TD4310 LCD panel"
+	depends on GPIOLIB && OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here to enable support for Anbernic designed panels with the
+	  TD4310 panel controller such as the ones used on the Anbernic RG
+	  Vita Pro.
+
 config DRM_PANEL_ARM_VERSATILE
 	tristate "ARM Versatile panel driver"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index c2c5cf817116..3b970085f54f 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_DRM_PANEL_ABT_Y030XX067A) += panel-abt-y030xx067a.o
+obj-$(CONFIG_DRM_PANEL_ANBERNIC_TD4310) += panel-anbernic-td4310.o
 obj-$(CONFIG_DRM_PANEL_ARM_VERSATILE) += panel-arm-versatile.o
 obj-$(CONFIG_DRM_PANEL_ASUS_Z00T_TM5P5_NT35596) += panel-asus-z00t-tm5p5-n35596.o
 obj-$(CONFIG_DRM_PANEL_AUO_A030JTN01) += panel-auo-a030jtn01.o
diff --git a/drivers/gpu/drm/panel/panel-anbernic-td4310.c b/drivers/gpu/drm/panel/panel-anbernic-td4310.c
new file mode 100644
index 000000000000..9a1b4525423c
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-anbernic-td4310.c
@@ -0,0 +1,257 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Anbernic panels with TD4310 panel controller.
+ *
+ * Copyright (C) 2026 Chris Morgan <macromorgan@hotmail.com>
+ *
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+#include <video/mipi_display.h>
+
+struct anbernic_panel_td4310_info {
+	const struct drm_display_mode *display_mode;
+	u16 width_mm;
+	u16 height_mm;
+	u32 bus_flags;
+	unsigned long mode_flags;
+	u32 format;
+	u32 lanes;
+	u16 prepare_delay;
+	u16 reset_delay;
+	u16 init_delay;
+	u16 enable_delay;
+	u16 disable_delay;
+	u16 unprepare_delay;
+};
+
+struct anbernic_panel_td4310 {
+	struct device *dev;
+	struct mipi_dsi_device *dsi;
+	struct drm_panel panel;
+	const struct anbernic_panel_td4310_info *panel_info;
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *enable_gpio;
+	struct regulator *vdd;
+	enum drm_panel_orientation orientation;
+};
+
+static inline struct anbernic_panel_td4310 *panel_to_anbernic_panel_td4310(struct drm_panel *panel)
+{
+	return container_of(panel, struct anbernic_panel_td4310, panel);
+}
+
+static int panel_anbernic_td4310_prepare(struct drm_panel *panel)
+{
+	struct anbernic_panel_td4310 *ctx = panel_to_anbernic_panel_td4310(panel);
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
+	int ret;
+
+	ret = regulator_enable(ctx->vdd);
+	if (ret)
+		return ret;
+
+	ret = gpiod_set_value_cansleep(ctx->enable_gpio, 1);
+	if (ret)
+		goto err_enable;
+
+	if (ctx->panel_info->enable_delay)
+		mipi_dsi_msleep(&dsi_ctx, ctx->panel_info->enable_delay);
+
+	ret = gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	if (ret)
+		goto err_reset;
+
+	mipi_dsi_msleep(&dsi_ctx, 10);
+
+	ret = gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	if (ret)
+		goto err_reset;
+
+	if (ctx->panel_info->reset_delay)
+		mipi_dsi_msleep(&dsi_ctx, ctx->panel_info->reset_delay);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, ctx->panel_info->prepare_delay);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, ctx->panel_info->prepare_delay);
+
+	if (dsi_ctx.accum_err) {
+		ret = dsi_ctx.accum_err;
+		goto err_reset;
+	}
+
+	return 0;
+
+err_reset:
+	gpiod_set_value_cansleep(ctx->enable_gpio, 0);
+err_enable:
+	regulator_disable(ctx->vdd);
+	return ret;
+}
+
+static int panel_anbernic_td4310_unprepare(struct drm_panel *panel)
+{
+	struct anbernic_panel_td4310 *ctx = panel_to_anbernic_panel_td4310(panel);
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, ctx->panel_info->unprepare_delay);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, ctx->panel_info->disable_delay);
+
+	gpiod_set_value_cansleep(ctx->enable_gpio, 0);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
+	regulator_disable(ctx->vdd);
+
+	return 0;
+}
+
+static int panel_anbernic_td4310_get_mode(struct drm_panel *panel,
+				    struct drm_connector *connector)
+{
+	struct anbernic_panel_td4310 *ctx = panel_to_anbernic_panel_td4310(panel);
+	const struct anbernic_panel_td4310_info *panel_info = ctx->panel_info;
+
+	connector->display_info.bpc = 8;
+	connector->display_info.width_mm = panel_info->width_mm;
+	connector->display_info.height_mm = panel_info->height_mm;
+	connector->display_info.bus_flags = panel_info->bus_flags;
+
+	return drm_connector_helper_get_modes_fixed(connector, panel_info->display_mode);
+}
+
+static enum drm_panel_orientation panel_anbernic_td4310_get_orientation(struct drm_panel *panel)
+{
+	struct anbernic_panel_td4310 *ctx = panel_to_anbernic_panel_td4310(panel);
+
+	return ctx->orientation;
+}
+
+static const struct drm_panel_funcs panel_anbernic_td4310_funcs = {
+	.prepare = panel_anbernic_td4310_prepare,
+	.unprepare = panel_anbernic_td4310_unprepare,
+	.get_modes = panel_anbernic_td4310_get_mode,
+	.get_orientation = panel_anbernic_td4310_get_orientation,
+};
+
+static int panel_anbernic_td4310_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct anbernic_panel_td4310 *ctx;
+	int ret;
+
+	ctx = devm_drm_panel_alloc(dev, struct anbernic_panel_td4310, panel,
+				   &panel_anbernic_td4310_funcs,
+				   DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+
+	ctx->dev = dev;
+
+	ctx->panel_info = of_device_get_match_data(dev);
+	if (!ctx->panel_info)
+		return -EINVAL;
+
+	ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to get panel orientation\n");
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+				     "Cannot get reset gpio\n");
+
+	ctx->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->enable_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->enable_gpio),
+				     "Cannot get enable gpio\n");
+
+	ctx->vdd = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(ctx->vdd))
+		return dev_err_probe(dev, PTR_ERR(ctx->vdd),
+				     "Failed to request vdd regulator\n");
+
+	ctx->dsi = dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	dsi->lanes = ctx->panel_info->lanes;
+	dsi->format = ctx->panel_info->format;
+	dsi->mode_flags = ctx->panel_info->mode_flags;
+
+	ret = drm_panel_of_backlight(&ctx->panel);
+	if (ret)
+		return ret;
+
+	devm_drm_panel_add(dev, &ctx->panel);
+
+	ret = devm_mipi_dsi_attach(dev, dsi);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
+
+	return 0;
+}
+
+static const struct drm_display_mode anbernic_vitapro_mode = {
+	.clock = 140020,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 50,
+	.hsync_end = 1080 + 50 + 4,
+	.htotal = 1080 + 50 + 4 + 50,
+	.vdisplay = 1920,
+	.vsync_start = 1920 + 15,
+	.vsync_end = 1920 + 15 + 4,
+	.vtotal = 1920 + 15 + 4 + 32,
+	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+};
+
+static const struct anbernic_panel_td4310_info anbernic_vitapro_info = {
+	.display_mode = &anbernic_vitapro_mode,
+	.width_mm = 69,
+	.height_mm = 121,
+	.bus_flags = DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
+	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
+		      MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET |
+		      MIPI_DSI_CLOCK_NON_CONTINUOUS,
+	.format = MIPI_DSI_FMT_RGB888,
+	.lanes = 4,
+	.prepare_delay = 50,
+	.reset_delay = 220,
+	.enable_delay = 120,
+	.disable_delay = 50,
+	.unprepare_delay = 20,
+};
+
+static const struct of_device_id panel_anbernic_td4310_of_match[] = {
+	{
+		.compatible = "anbernic,panel-vita-pro",
+		.data = &anbernic_vitapro_info,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, panel_anbernic_td4310_of_match);
+
+static struct mipi_dsi_driver anbernic_panel_td4310_driver = {
+	.driver = {
+		.name = "panel-anbernic-td4310",
+		.of_match_table = panel_anbernic_td4310_of_match,
+	},
+	.probe	= panel_anbernic_td4310_probe,
+};
+module_mipi_dsi_driver(anbernic_panel_td4310_driver);
+
+MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>");
+MODULE_DESCRIPTION("DRM driver for Anbernic TD4310 MIPI DSI panels");
+MODULE_LICENSE("GPL");