[PATCH v3 0/2] DRM: panel: add support for Sharp LQ079L1SX01 panel

[PATCH v3 0/2] DRM: panel: add support for Sharp LQ079L1SX01 panel

[Svyatoslav Ryhel]

Sharp LQ079L1SX01 panel is a LCD panel working in dual video mode found in
Xiaomi Mi Pad (A0101).

---
Changes in v2:
- adjusted schema with ">" and dsi0 > dsi
- fixed copyright from Nvidia to Xiaomi since sconfiguration equence is
  based on the downstream Xiaomi code.
- adjusted commit name of second commit

Changes in v3:
- tested with drm-misc-next
- switched to mipi_dsi_dual* macros
---

Svyatoslav Ryhel (2):
  dt-bindings: display: panel: document Sharp LQ079L1SX01 panel
  gpu/drm: panel: Add Sharp LQ079L1SX01 panel support

 .../display/panel/sharp,lq079l1sx01.yaml      |  99 ++++++++
 drivers/gpu/drm/panel/Kconfig                 |  15 ++
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-sharp-lq079l1sx01.c   | 225 ++++++++++++++++++
 4 files changed, 340 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/sharp,lq079l1sx01.yaml
 create mode 100644 drivers/gpu/drm/panel/panel-sharp-lq079l1sx01.c

-- 
2.48.1

[PATCH v3 1/2] dt-bindings: display: panel: document Sharp LQ079L1SX01 panel

[Svyatoslav Ryhel]

Document Sharp LQ079L1SX01 panel found in Xiaomi Mi Pad.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
---
 .../display/panel/sharp,lq079l1sx01.yaml      | 99 +++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/sharp,lq079l1sx01.yaml

diff --git a/Documentation/devicetree/bindings/display/panel/sharp,lq079l1sx01.yaml b/Documentation/devicetree/bindings/display/panel/sharp,lq079l1sx01.yaml
new file mode 100644
index 000000000000..08a35ebbbb3c
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/sharp,lq079l1sx01.yaml
@@ -0,0 +1,99 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/sharp,lq079l1sx01.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sharp Microelectronics 7.9" WQXGA TFT LCD panel
+
+maintainers:
+  - Svyatoslav Ryhel <clamor95@gmail.com>
+
+description: >
+  This panel requires a dual-channel DSI host to operate and it supports
+  only left-right split mode, where each channel drives the left or right
+  half of the screen and only video mode.
+
+  Each of the DSI channels controls a separate DSI peripheral.
+  The peripheral driven by the first link (DSI-LINK1), left one, is
+  considered the primary peripheral and controls the device.
+
+allOf:
+  - $ref: panel-common-dual.yaml#
+
+properties:
+  compatible:
+    const: sharp,lq079l1sx01
+
+  reg:
+    maxItems: 1
+
+  avdd-supply:
+    description: regulator that supplies the analog voltage
+
+  vddio-supply:
+    description: regulator that supplies the I/O voltage
+
+  vsp-supply:
+    description: positive boost supply regulator
+
+  vsn-supply:
+    description: negative boost supply regulator
+
+  reset-gpios:
+    maxItems: 1
+
+  backlight: true
+  ports: true
+
+required:
+  - compatible
+  - reg
+  - avdd-supply
+  - vddio-supply
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "sharp,lq079l1sx01";
+            reg = <0>;
+
+            reset-gpios = <&gpio 59 GPIO_ACTIVE_LOW>;
+
+            avdd-supply = <&avdd_lcd>;
+            vddio-supply = <&vdd_lcd_io>;
+            vsp-supply = <&vsp_5v5_lcd>;
+            vsn-supply = <&vsn_5v5_lcd>;
+
+            backlight = <&backlight>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    panel_in0: endpoint {
+                        remote-endpoint = <&dsi0_out>;
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+                    panel_in1: endpoint {
+                        remote-endpoint = <&dsi1_out>;
+                    };
+                };
+            };
+        };
+    };
+...
-- 
2.48.1

[PATCH v3 2/2] gpu/drm: panel: Add Sharp LQ079L1SX01 panel support

[Svyatoslav Ryhel]

This panel requires dual-channel mode. The device accepts video-mode data
on 8 lanes and will therefore need a dual-channel DSI controller. The two
interfaces that make up this device need to be instantiated in the
controllers that gang up to provide the dual-channel DSI host.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/panel/Kconfig                 |  15 ++
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-sharp-lq079l1sx01.c   | 225 ++++++++++++++++++
 3 files changed, 241 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-sharp-lq079l1sx01.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 407c5f6a268b..045ffb2ccd0f 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -888,6 +888,21 @@ config DRM_PANEL_SEIKO_43WVF1G
 	  Say Y here if you want to enable support for the Seiko
 	  43WVF1G controller for 800x480 LCD panels
 
+config DRM_PANEL_SHARP_LQ079L1SX01
+	tristate "Sharp LQ079L1SX01 panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	select VIDEOMODE_HELPERS
+	help
+	  Say Y here if you want to enable support for Sharp LQ079L1SX01
+	  TFT-LCD modules. The panel has a 2560x1600 resolution and uses
+	  24 bit RGB per pixel. It provides a dual MIPI DSI interface to
+	  the host.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called panel-sharp-lq079l1sx01.
+
 config DRM_PANEL_SHARP_LQ101R1SX01
 	tristate "Sharp LQ101R1SX01 panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 3615a761b44f..0356775a443a 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -91,6 +91,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA5X01_AMS561RA01) += panel-samsung-s6e8aa5x01-ams561ra01.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_SOFEF00) += panel-samsung-sofef00.o
 obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
+obj-$(CONFIG_DRM_PANEL_SHARP_LQ079L1SX01) += panel-sharp-lq079l1sx01.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
diff --git a/drivers/gpu/drm/panel/panel-sharp-lq079l1sx01.c b/drivers/gpu/drm/panel/panel-sharp-lq079l1sx01.c
new file mode 100644
index 000000000000..8c00fde1c4a9
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-sharp-lq079l1sx01.c
@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2016 XiaoMi, Inc.
+ * Copyright (c) 2024 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_device.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+static const struct regulator_bulk_data sharp_supplies[] = {
+	{ .supply = "avdd" }, { .supply = "vddio" },
+	{ .supply = "vsp" }, { .supply = "vsn" },
+};
+
+struct sharp_panel {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi[2];
+
+	struct gpio_desc *reset_gpio;
+	struct regulator_bulk_data *supplies;
+
+	const struct drm_display_mode *mode;
+};
+
+static inline struct sharp_panel *to_sharp_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct sharp_panel, panel);
+}
+
+static void sharp_panel_reset(struct sharp_panel *sharp)
+{
+	gpiod_set_value_cansleep(sharp->reset_gpio, 1);
+	usleep_range(2000, 3000);
+	gpiod_set_value_cansleep(sharp->reset_gpio, 0);
+	usleep_range(2000, 3000);
+}
+
+static int sharp_panel_prepare(struct drm_panel *panel)
+{
+	struct sharp_panel *sharp = to_sharp_panel(panel);
+	struct device *dev = panel->dev;
+	struct mipi_dsi_device *dsi0 = sharp->dsi[0];
+	struct mipi_dsi_device *dsi1 = sharp->dsi[1];
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = NULL };
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(sharp_supplies), sharp->supplies);
+	if (ret) {
+		dev_err(dev, "error enabling regulators (%d)\n", ret);
+		return ret;
+	}
+
+	msleep(24);
+
+	if (sharp->reset_gpio)
+		sharp_panel_reset(sharp);
+
+	msleep(32);
+
+	mipi_dsi_dual_dcs_write_seq_multi(&dsi_ctx, dsi0, dsi1, MIPI_DCS_EXIT_SLEEP_MODE);
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	mipi_dsi_dual_dcs_write_seq_multi(&dsi_ctx, dsi0, dsi1,
+					  MIPI_DCS_SET_DISPLAY_BRIGHTNESS, 0xff);
+	mipi_dsi_dual_dcs_write_seq_multi(&dsi_ctx, dsi0, dsi1,
+					  MIPI_DCS_WRITE_POWER_SAVE, 0x01);
+	mipi_dsi_dual_dcs_write_seq_multi(&dsi_ctx, dsi0, dsi1,
+					  MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x2c);
+
+	mipi_dsi_dual_dcs_write_seq_multi(&dsi_ctx, dsi0, dsi1, MIPI_DCS_SET_DISPLAY_ON);
+
+	return 0;
+}
+
+static int sharp_panel_unprepare(struct drm_panel *panel)
+{
+	struct sharp_panel *sharp = to_sharp_panel(panel);
+	struct mipi_dsi_device *dsi0 = sharp->dsi[0];
+	struct mipi_dsi_device *dsi1 = sharp->dsi[1];
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = NULL };
+
+	mipi_dsi_dual_dcs_write_seq_multi(&dsi_ctx, dsi0, dsi1, MIPI_DCS_SET_DISPLAY_OFF);
+	mipi_dsi_msleep(&dsi_ctx, 100);
+	mipi_dsi_dual_dcs_write_seq_multi(&dsi_ctx, dsi0, dsi1, MIPI_DCS_ENTER_SLEEP_MODE);
+	mipi_dsi_msleep(&dsi_ctx, 150);
+
+	if (sharp->reset_gpio)
+		gpiod_set_value_cansleep(sharp->reset_gpio, 1);
+
+	return regulator_bulk_disable(ARRAY_SIZE(sharp_supplies), sharp->supplies);
+}
+
+static const struct drm_display_mode default_mode = {
+	.clock = (1536 + 136 + 28 + 28) * (2048 + 14 + 8 + 2) * 60 / 1000,
+	.hdisplay = 1536,
+	.hsync_start = 1536 + 136,
+	.hsync_end = 1536 + 136 + 28,
+	.htotal = 1536 + 136 + 28 + 28,
+	.vdisplay = 2048,
+	.vsync_start = 2048 + 14,
+	.vsync_end = 2048 + 14 + 8,
+	.vtotal = 2048 + 14 + 8 + 2,
+	.width_mm = 120,
+	.height_mm = 160,
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static int sharp_panel_get_modes(struct drm_panel *panel,
+				 struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector, &default_mode);
+}
+
+static const struct drm_panel_funcs sharp_panel_funcs = {
+	.unprepare = sharp_panel_unprepare,
+	.prepare = sharp_panel_prepare,
+	.get_modes = sharp_panel_get_modes,
+};
+
+static int sharp_panel_probe(struct mipi_dsi_device *dsi)
+{
+	const struct mipi_dsi_device_info info = { "sharp-link1", 0, NULL };
+	struct device *dev = &dsi->dev;
+	struct device_node *dsi_r;
+	struct mipi_dsi_host *dsi_r_host;
+	struct sharp_panel *sharp;
+	int i, ret;
+
+	sharp = devm_drm_panel_alloc(dev, struct sharp_panel, panel,
+				     &sharp_panel_funcs, DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(sharp))
+		return PTR_ERR(sharp);
+
+	ret = devm_regulator_bulk_get_const(dev, ARRAY_SIZE(sharp_supplies),
+					    sharp_supplies, &sharp->supplies);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to get supplies\n");
+
+	sharp->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(sharp->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(sharp->reset_gpio),
+				     "failed to get reset GPIO\n");
+
+	/* Panel is always connected to two DSI hosts, DSI0 is left, DSI1 is right */
+	dsi_r = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
+	if (!dsi_r)
+		return dev_err_probe(dev, -ENODEV, "failed to find second DSI host node\n");
+
+	dsi_r_host = of_find_mipi_dsi_host_by_node(dsi_r);
+	of_node_put(dsi_r);
+	if (!dsi_r_host)
+		return dev_err_probe(dev, -EPROBE_DEFER, "cannot get secondary DSI host\n");
+
+	sharp->dsi[1] = devm_mipi_dsi_device_register_full(dev, dsi_r_host, &info);
+	if (IS_ERR(sharp->dsi[1]))
+		return dev_err_probe(dev, PTR_ERR(sharp->dsi[1]),
+				     "second link registration failed\n");
+
+	sharp->dsi[0] = dsi;
+	mipi_dsi_set_drvdata(dsi, sharp);
+
+	ret = drm_panel_of_backlight(&sharp->panel);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get backlight\n");
+
+	drm_panel_add(&sharp->panel);
+
+	for (i = 0; i < ARRAY_SIZE(sharp->dsi); i++) {
+		if (!sharp->dsi[i])
+			continue;
+
+		sharp->dsi[i]->lanes = 4;
+		sharp->dsi[i]->format = MIPI_DSI_FMT_RGB888;
+		sharp->dsi[i]->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM;
+
+		ret = devm_mipi_dsi_attach(dev, sharp->dsi[i]);
+		if (ret < 0) {
+			drm_panel_remove(&sharp->panel);
+			return dev_err_probe(dev, ret, "failed to attach to DSI%d\n", i);
+		}
+	}
+
+	return 0;
+}
+
+static void sharp_panel_remove(struct mipi_dsi_device *dsi)
+{
+	struct sharp_panel *sharp = mipi_dsi_get_drvdata(dsi);
+
+	drm_panel_remove(&sharp->panel);
+}
+
+static const struct of_device_id sharp_of_match[] = {
+	{ .compatible = "sharp,lq079l1sx01" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sharp_of_match);
+
+static struct mipi_dsi_driver sharp_panel_driver = {
+	.driver = {
+		.name = "panel-sharp-lq079l1sx01",
+		.of_match_table = sharp_of_match,
+	},
+	.probe = sharp_panel_probe,
+	.remove = sharp_panel_remove,
+};
+module_mipi_dsi_driver(sharp_panel_driver);
+
+MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
+MODULE_DESCRIPTION("Sharp LQ079L1SX01 panel driver");
+MODULE_LICENSE("GPL");
-- 
2.48.1

Re: [PATCH v3 0/2] DRM: panel: add support for Sharp LQ079L1SX01 panel

[Neil Armstrong]

Hi,

On Fri, 19 Sep 2025 18:38:37 +0300, Svyatoslav Ryhel wrote:
> Sharp LQ079L1SX01 panel is a LCD panel working in dual video mode found in
> Xiaomi Mi Pad (A0101).
> 

Thanks, Applied to https://gitlab.freedesktop.org/drm/misc/kernel.git (drm-misc-next)

[1/2] dt-bindings: display: panel: document Sharp LQ079L1SX01 panel
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/16c5b1a63623da251ae842b45fe10263d33bf71c
[2/2] gpu/drm: panel: Add Sharp LQ079L1SX01 panel support
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/306e6407ed96ca3dcae5e3dbec8cf207ea33fbee

-- 
Neil