* [PATCH v4 1/2] dt-bindings: display: panel: document Synaptics TDDI panel
2025-08-19 14:56 [PATCH v4 0/2] Support for Synaptics TDDI series panels Kaustabh Chakraborty
@ 2025-08-19 14:56 ` Kaustabh Chakraborty
2025-08-20 7:46 ` Krzysztof Kozlowski
2025-08-19 14:56 ` [PATCH v4 2/2] drm: panel: add support for Synaptics TDDI series DSI panels Kaustabh Chakraborty
2025-08-19 22:45 ` [PATCH v4 0/2] Support for Synaptics TDDI series panels Rob Herring
2 siblings, 1 reply; 5+ messages in thread
From: Kaustabh Chakraborty @ 2025-08-19 14:56 UTC (permalink / raw)
To: Neil Armstrong, Jessica Zhang, David Airlie, Simona Vetter,
Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Rob Herring,
Krzysztof Kozlowski, Conor Dooley, Jessica Zhang
Cc: dri-devel, devicetree, linux-kernel, Kaustabh Chakraborty
Document the Synaptics TDDI (Touch/Display Integration) panel hardware.
Along with the MIPI-DSI panel, these devices also have an in-built LED
backlight device and a touchscreen, all packed together in a single chip.
Also, add compatibles for supported panels - TD4101 and TD4300. Both
have the '-panel' suffix so as to remove any ambiguity between the panel
and touchscreen chips.
Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
---
.../display/panel/synaptics,td4300-panel.yaml | 89 ++++++++++++++++++++++
1 file changed, 89 insertions(+)
diff --git a/Documentation/devicetree/bindings/display/panel/synaptics,td4300-panel.yaml b/Documentation/devicetree/bindings/display/panel/synaptics,td4300-panel.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..152d94367130e9d80a885fe87a2da53db88e3393
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/synaptics,td4300-panel.yaml
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/synaptics,td4300-panel.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synaptics TDDI Display Panel Controller
+
+maintainers:
+ - Kaustabh Chakraborty <kauschluss@disroot.org>
+
+allOf:
+ - $ref: panel-common.yaml#
+
+properties:
+ compatible:
+ enum:
+ - syna,td4101-panel
+ - syna,td4300-panel
+
+ reg:
+ maxItems: 1
+
+ vio-supply:
+ description: core I/O voltage supply
+
+ vsn-supply:
+ description: negative voltage supply for analog circuits
+
+ vsp-supply:
+ description: positive voltage supply for analog circuits
+
+ backlight-gpios:
+ maxItems: 1
+ description: backlight enable GPIO
+
+ reset-gpios: true
+ width-mm: true
+ height-mm: true
+ panel-timing: true
+
+required:
+ - compatible
+ - reg
+ - width-mm
+ - height-mm
+ - panel-timing
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ dsi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ panel@0 {
+ compatible = "syna,td4300-panel";
+ reg = <0>;
+
+ vio-supply = <&panel_vio_reg>;
+ vsn-supply = <&panel_vsn_reg>;
+ vsp-supply = <&panel_vsp_reg>;
+
+ backlight-gpios = <&gpd3 5 GPIO_ACTIVE_LOW>;
+ reset-gpios = <&gpd3 4 GPIO_ACTIVE_LOW>;
+
+ width-mm = <68>;
+ height-mm = <121>;
+
+ panel-timing {
+ clock-frequency = <144389520>;
+
+ hactive = <1080>;
+ hsync-len = <4>;
+ hfront-porch = <120>;
+ hback-porch = <32>;
+
+ vactive = <1920>;
+ vsync-len = <2>;
+ vfront-porch = <21>;
+ vback-porch = <4>;
+ };
+ };
+ };
+
+...
--
2.50.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v4 2/2] drm: panel: add support for Synaptics TDDI series DSI panels
2025-08-19 14:56 [PATCH v4 0/2] Support for Synaptics TDDI series panels Kaustabh Chakraborty
2025-08-19 14:56 ` [PATCH v4 1/2] dt-bindings: display: panel: document Synaptics TDDI panel Kaustabh Chakraborty
@ 2025-08-19 14:56 ` Kaustabh Chakraborty
2025-08-19 22:45 ` [PATCH v4 0/2] Support for Synaptics TDDI series panels Rob Herring
2 siblings, 0 replies; 5+ messages in thread
From: Kaustabh Chakraborty @ 2025-08-19 14:56 UTC (permalink / raw)
To: Neil Armstrong, Jessica Zhang, David Airlie, Simona Vetter,
Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Rob Herring,
Krzysztof Kozlowski, Conor Dooley, Jessica Zhang
Cc: dri-devel, devicetree, linux-kernel, Kaustabh Chakraborty
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 | 276 +++++++++++++++++++++++++++
3 files changed, 288 insertions(+)
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 09b9f7ff9340abb708a503f7564acc46b2faaf7d..b080da939f5e3d11bf4c437ae167480d2721b41f 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.
+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..a6e786e2b578e09d95de5b6430eba94c668ee4bc 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -98,6 +98,7 @@ obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
obj-$(CONFIG_DRM_PANEL_SUMMIT) += panel-summit.o
obj-$(CONFIG_DRM_PANEL_SYNAPTICS_R63353) += panel-synaptics-r63353.o
+obj-$(CONFIG_DRM_PANEL_SYNAPTICS_TDDI) += panel-synaptics-tddi.o
obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) += panel-sony-acx565akm.o
obj-$(CONFIG_DRM_PANEL_SONY_TD4353_JDI) += panel-sony-td4353-jdi.o
obj-$(CONFIG_DRM_PANEL_SONY_TULIP_TRULY_NT35521) += panel-sony-tulip-truly-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..a4b3cbdebb6ca4062c02c6e7ac184f3ec245926a
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-synaptics-tddi.c
@@ -0,0 +1,276 @@
+// 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>
+#include <drm/drm_probe_helper.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;
+};
+
+static const struct regulator_bulk_data tddi_supplies[] = {
+ { .supply = "vio" },
+ { .supply = "vsn" },
+ { .supply = "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 = bl_get_data(backlight);
+ struct mipi_dsi_multi_context dsi = { .dsi = ctx->dsi };
+ u8 brightness = 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 = to_tddi_ctx(panel);
+ struct device *dev = &ctx->dsi->dev;
+ int ret;
+
+ ret = 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 = 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 = to_tddi_ctx(panel);
+ struct mipi_dsi_multi_context dsi = { .dsi = ctx->dsi };
+ u8 brightness = 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 = to_tddi_ctx(panel);
+ struct mipi_dsi_multi_context dsi = { .dsi = 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 = to_tddi_ctx(panel);
+
+ return drm_connector_helper_get_modes_fixed(connector, &ctx->mode);
+}
+
+static const struct backlight_ops tddi_bl_ops = {
+ .update_status = tddi_update_status,
+};
+
+static const struct backlight_properties tddi_bl_props = {
+ .type = BACKLIGHT_PLATFORM,
+ .brightness = 255,
+ .max_brightness = 255,
+};
+
+static const struct drm_panel_funcs tddi_drm_panel_funcs = {
+ .prepare = tddi_prepare,
+ .unprepare = tddi_unprepare,
+ .enable = tddi_enable,
+ .disable = tddi_disable,
+ .get_modes = tddi_get_modes,
+};
+
+static int tddi_probe(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ struct tddi_ctx *ctx;
+ int ret;
+
+ ctx = 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 = of_device_get_match_data(dev);
+
+ ctx->dsi = dsi;
+ mipi_dsi_set_drvdata(dsi, ctx);
+
+ ret = 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 = devm_gpiod_get_optional(dev, "backlight", GPIOD_ASIS);
+ 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 = 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 = of_get_drm_panel_display_mode(dev->of_node, &ctx->mode, NULL);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "failed to get panel timings\n");
+
+ ctx->backlight = devm_backlight_device_register(dev, dev_name(dev), dev,
+ ctx, &tddi_bl_ops,
+ &tddi_bl_props);
+ if (IS_ERR(ctx->backlight))
+ return dev_err_probe(dev, PTR_ERR(ctx->backlight),
+ "failed to register backlight device");
+
+ dsi->lanes = ctx->data->lanes;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
+ MIPI_DSI_MODE_VIDEO_NO_HFP;
+
+ ctx->panel.prepare_prev_first = true;
+ drm_panel_add(&ctx->panel);
+
+ ret = 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 = mipi_dsi_get_drvdata(dsi);
+
+ drm_panel_remove(&ctx->panel);
+}
+
+static const struct tddi_panel_data td4101_panel_data = {
+ .lanes = 2,
+ /* wait timings for panel enable */
+ .delay_ms_sleep_exit = 100,
+ .delay_ms_display_on = 0,
+ /* wait timings for panel disable */
+ .delay_ms_display_off = 20,
+ .delay_ms_sleep_enter = 90,
+};
+
+static const struct tddi_panel_data td4300_panel_data = {
+ .lanes = 4,
+ /* wait timings for panel enable */
+ .delay_ms_sleep_exit = 100,
+ .delay_ms_display_on = 0,
+ /* wait timings for panel disable */
+ .delay_ms_display_off = 0,
+ .delay_ms_sleep_enter = 0,
+};
+
+static const struct of_device_id tddi_of_device_id[] = {
+ {
+ .compatible = "syna,td4101-panel",
+ .data = &td4101_panel_data,
+ }, {
+ .compatible = "syna,td4300-panel",
+ .data = &td4300_panel_data,
+ }, { }
+};
+MODULE_DEVICE_TABLE(of, tddi_of_device_id);
+
+static struct mipi_dsi_driver tddi_dsi_driver = {
+ .probe = tddi_probe,
+ .remove = tddi_remove,
+ .driver = {
+ .name = "panel-synaptics-tddi",
+ .of_match_table = 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");
--
2.50.0
^ permalink raw reply related [flat|nested] 5+ messages in thread