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From: Kaustabh Chakraborty <kauschluss@disroot.org>
Date: Sun, 20 Jul 2025 17:31:55 +0530
Subject: [PATCH v3 2/2] drm: panel: add support for Synaptics TDDI series
 DSI panels
Precedence: bulk
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Message-Id: <20250720-panel-synaptics-tddi-v3-2-43a5957f4b24@disroot.org>
References: <20250720-panel-synaptics-tddi-v3-0-43a5957f4b24@disroot.org>
In-Reply-To: <20250720-panel-synaptics-tddi-v3-0-43a5957f4b24@disroot.org>
To: Neil Armstrong <neil.armstrong@linaro.org>,
 Jessica Zhang <quic_jesszhan@quicinc.com>, David Airlie <airlied@gmail.com>,
 Simona Vetter <simona@ffwll.ch>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>,
 Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>,
 Conor Dooley <conor+dt@kernel.org>,
 Jessica Zhang <jessica.zhang@oss.qualcomm.com>
Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, Kaustabh Chakraborty <kauschluss@disroot.org>
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Synaptics TDDI (Touch/Display Integration) panels utilize a single chip
for display and touch controllers. Implement a simple device driver for
such panels, along with its built-in LED backlight controller, and add
support for TD4101 and TD4300 panels in the driver.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
---
 drivers/gpu/drm/panel/Kconfig                |  11 +
 drivers/gpu/drm/panel/Makefile               |   1 +
 drivers/gpu/drm/panel/panel-synaptics-tddi.c | 289 +++++++++++++++++++++++=
++++
 3 files changed, 301 insertions(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 09b9f7ff9340abb708a503f7564acc46b2faaf7d..b080da939f5e3d11bf4c437ae16=
7480d2721b41f 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -1021,6 +1021,17 @@ config DRM_PANEL_SYNAPTICS_R63353
 	  Say Y if you want to enable support for panels based on the
 	  Synaptics R63353 controller.
=20
+config DRM_PANEL_SYNAPTICS_TDDI
+	tristate "Synaptics TDDI display panels"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y if you want to enable support for the Synaptics TDDI display
+	  panels. There are multiple MIPI DSI panels manufactured under the TDDI
+	  namesake, with varying resolutions and data lanes. They also have a
+	  built-in LED backlight and a touch controller.
+
 config DRM_PANEL_TDO_TL070WSH30
 	tristate "TDO TL070WSH30 DSI panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 957555b499968ebbfb55c87d2729ce88b5d48a57..a6e786e2b578e09d95de5b6430e=
ba94c668ee4bc 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -98,6 +98,7 @@ obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) +=3D panel-sitron=
ix-st7703.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) +=3D panel-sitronix-st7789v.o
 obj-$(CONFIG_DRM_PANEL_SUMMIT) +=3D panel-summit.o
 obj-$(CONFIG_DRM_PANEL_SYNAPTICS_R63353) +=3D panel-synaptics-r63353.o
+obj-$(CONFIG_DRM_PANEL_SYNAPTICS_TDDI) +=3D panel-synaptics-tddi.o
 obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) +=3D panel-sony-acx565akm.o
 obj-$(CONFIG_DRM_PANEL_SONY_TD4353_JDI) +=3D panel-sony-td4353-jdi.o
 obj-$(CONFIG_DRM_PANEL_SONY_TULIP_TRULY_NT35521) +=3D panel-sony-tulip-tru=
ly-nt35521.o
diff --git a/drivers/gpu/drm/panel/panel-synaptics-tddi.c b/drivers/gpu/drm=
/panel/panel-synaptics-tddi.c
new file mode 100644
index 0000000000000000000000000000000000000000..1e99be8791770437ce22c482320=
a7c475f50019e
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-synaptics-tddi.c
@@ -0,0 +1,289 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Synaptics TDDI display panel driver.
+ *
+ * Copyright (C) 2025 Kaustabh Chakraborty <kauschluss@disroot.org>
+ */
+
+#include <linux/backlight.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+struct tddi_panel_data {
+	u8 lanes;
+	/* wait timings for panel enable */
+	u8 delay_ms_sleep_exit;
+	u8 delay_ms_display_on;
+	/* wait timings for panel disable */
+	u8 delay_ms_display_off;
+	u8 delay_ms_sleep_enter;
+};
+
+struct tddi_ctx {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct drm_display_mode mode;
+	struct backlight_device *backlight;
+	const struct tddi_panel_data *data;
+	struct regulator_bulk_data *supplies;
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *backlight_gpio;
+	u32 bus_flags;
+	u32 width;
+	u32 height;
+};
+
+static const struct regulator_bulk_data tddi_supplies[] =3D {
+	{ .supply =3D "vio" },
+	{ .supply =3D "vsn" },
+	{ .supply =3D "vsp" },
+};
+
+static inline struct tddi_ctx *to_tddi_ctx(struct drm_panel *panel)
+{
+	return container_of(panel, struct tddi_ctx, panel);
+}
+
+static int tddi_update_status(struct backlight_device *backlight)
+{
+	struct tddi_ctx *ctx =3D bl_get_data(backlight);
+	struct mipi_dsi_multi_context dsi =3D { .dsi =3D ctx->dsi };
+	u8 brightness =3D backlight_get_brightness(backlight);
+
+	if (!ctx->panel.enabled)
+		return 0;
+
+	mipi_dsi_dcs_set_display_brightness_multi(&dsi, brightness);
+
+	return dsi.accum_err;
+}
+
+static int tddi_prepare(struct drm_panel *panel)
+{
+	struct tddi_ctx *ctx =3D to_tddi_ctx(panel);
+	struct device *dev =3D &ctx->dsi->dev;
+	int ret;
+
+	ret =3D regulator_bulk_enable(ARRAY_SIZE(tddi_supplies), ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(5000, 6000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(5000, 6000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 11000);
+
+	gpiod_set_value_cansleep(ctx->backlight_gpio, 0);
+	usleep_range(5000, 6000);
+
+	return 0;
+}
+
+static int tddi_unprepare(struct drm_panel *panel)
+{
+	struct tddi_ctx *ctx =3D to_tddi_ctx(panel);
+
+	gpiod_set_value_cansleep(ctx->backlight_gpio, 1);
+	usleep_range(5000, 6000);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(5000, 6000);
+
+	regulator_bulk_disable(ARRAY_SIZE(tddi_supplies), ctx->supplies);
+
+	return 0;
+}
+
+static int tddi_enable(struct drm_panel *panel)
+{
+	struct tddi_ctx *ctx =3D to_tddi_ctx(panel);
+	struct mipi_dsi_multi_context dsi =3D { .dsi =3D ctx->dsi };
+	u8 brightness =3D ctx->backlight->props.brightness;
+
+	mipi_dsi_dcs_write_seq_multi(&dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x0c);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi);
+	mipi_dsi_msleep(&dsi, ctx->data->delay_ms_sleep_exit);
+
+	/* sync the panel with the backlight's brightness level */
+	mipi_dsi_dcs_set_display_brightness_multi(&dsi, brightness);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi);
+	mipi_dsi_msleep(&dsi, ctx->data->delay_ms_display_on);
+
+	return dsi.accum_err;
+};
+
+static int tddi_disable(struct drm_panel *panel)
+{
+	struct tddi_ctx *ctx =3D to_tddi_ctx(panel);
+	struct mipi_dsi_multi_context dsi =3D { .dsi =3D ctx->dsi };
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi);
+	mipi_dsi_msleep(&dsi, ctx->data->delay_ms_display_off);
+
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi);
+	mipi_dsi_msleep(&dsi, ctx->data->delay_ms_sleep_enter);
+
+	return dsi.accum_err;
+}
+
+static int tddi_get_modes(struct drm_panel *panel,
+			  struct drm_connector *connector)
+{
+	struct tddi_ctx *ctx =3D to_tddi_ctx(panel);
+	struct drm_display_mode *mode;
+
+	mode =3D drm_mode_duplicate(connector->dev, &ctx->mode);
+	if (!mode)
+		return -ENOMEM;
+
+	mode->type |=3D DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_probed_add(connector, mode);
+	drm_mode_set_name(mode);
+
+	connector->display_info.width_mm =3D mode->width_mm;
+	connector->display_info.height_mm =3D mode->height_mm;
+	connector->display_info.bus_flags =3D ctx->bus_flags;
+
+	return 1;
+}
+
+static const struct backlight_ops tddi_bl_ops =3D {
+	.update_status =3D tddi_update_status,
+};
+
+static const struct drm_panel_funcs tddi_drm_panel_funcs =3D {
+	.prepare =3D tddi_prepare,
+	.unprepare =3D tddi_unprepare,
+	.enable =3D tddi_enable,
+	.disable =3D tddi_disable,
+	.get_modes =3D tddi_get_modes,
+};
+
+static int tddi_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev =3D &dsi->dev;
+	struct tddi_ctx *ctx;
+	int ret;
+
+	ctx =3D devm_drm_panel_alloc(dev, struct tddi_ctx, panel,
+				   &tddi_drm_panel_funcs, DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+
+	ctx->data =3D of_device_get_match_data(dev);
+
+	ctx->dsi =3D dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	ret =3D devm_regulator_bulk_get_const(dev, ARRAY_SIZE(tddi_supplies),
+					    tddi_supplies, &ctx->supplies);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to get regulators\n");
+
+	ctx->backlight_gpio =3D devm_gpiod_get_optional(dev, "backlight", GPIOD_A=
SIS);
+	if (IS_ERR(ctx->backlight_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->backlight_gpio),
+				     "failed to get backlight-gpios\n");
+
+	ctx->reset_gpio =3D devm_gpiod_get_optional(dev, "reset", GPIOD_ASIS);
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+				     "failed to get reset-gpios\n");
+
+	ret =3D of_get_drm_panel_display_mode(dev->of_node, &ctx->mode,
+					    &ctx->bus_flags);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to get panel timings\n");
+
+	ctx->backlight =3D devm_backlight_device_register(dev, dev_name(dev), dev,
+							ctx, &tddi_bl_ops, NULL);
+	if (IS_ERR(ctx->backlight))
+		return dev_err_probe(dev, PTR_ERR(ctx->backlight),
+				     "failed to register backlight device");
+
+	ctx->backlight->props.type =3D BACKLIGHT_PLATFORM;
+	ctx->backlight->props.brightness =3D 255;
+	ctx->backlight->props.max_brightness =3D 255;
+
+	dsi->lanes =3D ctx->data->lanes;
+	dsi->format =3D MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags =3D MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
+			  MIPI_DSI_MODE_VIDEO_NO_HFP;
+
+	ctx->panel.prepare_prev_first =3D true;
+	drm_panel_add(&ctx->panel);
+
+	ret =3D devm_mipi_dsi_attach(dev, dsi);
+	if (ret < 0) {
+		drm_panel_remove(&ctx->panel);
+		return dev_err_probe(dev, ret, "failed to attach to DSI host\n");
+	}
+
+	return 0;
+}
+
+static void tddi_remove(struct mipi_dsi_device *dsi)
+{
+	struct tddi_ctx *ctx =3D mipi_dsi_get_drvdata(dsi);
+
+	drm_panel_remove(&ctx->panel);
+}
+
+static const struct tddi_panel_data td4101_panel_data =3D {
+	.lanes =3D 2,
+	/* wait timings for panel enable */
+	.delay_ms_sleep_exit =3D 100,
+	.delay_ms_display_on =3D 0,
+	/* wait timings for panel disable */
+	.delay_ms_display_off =3D 20,
+	.delay_ms_sleep_enter =3D 90,
+};
+
+static const struct tddi_panel_data td4300_panel_data =3D {
+	.lanes =3D 4,
+	/* wait timings for panel enable */
+	.delay_ms_sleep_exit =3D 100,
+	.delay_ms_display_on =3D 0,
+	/* wait timings for panel disable */
+	.delay_ms_display_off =3D 0,
+	.delay_ms_sleep_enter =3D 0,
+};
+
+static const struct of_device_id tddi_of_device_id[] =3D {
+	{
+		.compatible =3D "syna,td4101-panel",
+		.data =3D &td4101_panel_data,
+	}, {
+		.compatible =3D "syna,td4300-panel",
+		.data =3D &td4300_panel_data,
+	}, { }
+};
+MODULE_DEVICE_TABLE(of, tddi_of_device_id);
+
+static struct mipi_dsi_driver tddi_dsi_driver =3D {
+	.probe =3D tddi_probe,
+	.remove =3D tddi_remove,
+	.driver =3D {
+		.name =3D "panel-synaptics-tddi",
+		.of_match_table =3D tddi_of_device_id,
+	},
+};
+module_mipi_dsi_driver(tddi_dsi_driver);
+
+MODULE_AUTHOR("Kaustabh Chakraborty <kauschluss@disroot.org>");
+MODULE_DESCRIPTION("Synaptics TDDI Display Panel Driver");
+MODULE_LICENSE("GPL");

--=20
2.50.0