[PATCH v3 0/2] Add driver for Raydium RM69380-based DSI panels

[PATCH v3 0/2] Add driver for Raydium RM69380-based DSI panels

[David Wronek]

This patch adds support the 2560x1600@90Hz dual DSI command mode panel by
EDO in combination with a Raydium RM69380 driver IC.

This driver IC can be found in the following devices:
 * Lenovo Xiaoxin Pad Pro 2021 (TB-J716F) with EDO panel
 * Lenovo Tab P11 Pro (TB-J706F) with EDO panel
 * Robo & Kala 2-in-1 Laptop with Sharp panel

Signed-off-by: David Wronek <david@mainlining.org>
---
Changes in v3:
- Removed unneeded curly brackets from some if statments
- Fix error handling code in probe function
- Include video/mipi_display.h and make use of MIPI command definitions
- Removed DRM_MODE_TYPE_PREFERRED
- Dropped 'prepared' bool entirely
- Register second DSI host using mipi_dsi_device_register_full()
- Link to v2: https://lore.kernel.org/r/20240415-raydium-rm69380-driver-v2-0-524216461306@mainlining.org

Changes in v2:
- Fixed typo in Kconfig
- Removed ctx->prepared = true; in prepare function
- Switched to drm_connector_helper_get_modes_fixed in get_modes function
- Changed dev_notice() to dev_dbg()
- Add description for compatible and reset-gpio in the dt-binding
- Always require 'ports' node in the dt-binding regardless of compatible
- Link to v1: https://lore.kernel.org/r/20240414-raydium-rm69380-driver-v1-0-5e86ba2490b5@mainlining.org

---
David Wronek (2):
      dt-bindings: display: panel: Add Raydium RM69380
      drm/panel: Add driver for EDO RM69380 OLED panel

 .../bindings/display/panel/raydium,rm69380.yaml    |  91 +++++
 drivers/gpu/drm/panel/Kconfig                      |  14 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 drivers/gpu/drm/panel/panel-raydium-rm69380.c      | 367 +++++++++++++++++++++
 4 files changed, 473 insertions(+)
---
base-commit: 66e4190e92ce0e4a50b2f6be0e5f5b2e47e072f4
change-id: 20240414-raydium-rm69380-driver-47f22b6f24fe

Best regards,
-- 
David Wronek <david@mainlining.org>

[PATCH v3 1/2] dt-bindings: display: panel: Add Raydium RM69380

[David Wronek]

Raydium RM69380 is a display driver IC used to drive OLED DSI panels.
Add a dt-binding for it.

Signed-off-by: David Wronek <david@mainlining.org>
---
Note:
Depends on commit 48a516363e29 ("dt-bindings: display: panel: add common dual-link schema")
---
 .../bindings/display/panel/raydium,rm69380.yaml    | 91 ++++++++++++++++++++++
 1 file changed, 91 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/raydium,rm69380.yaml b/Documentation/devicetree/bindings/display/panel/raydium,rm69380.yaml
new file mode 100644
index 000000000000..0ac7d033cbe0
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/raydium,rm69380.yaml
@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/raydium,rm69380.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Raydium RM6380-based DSI display panels
+
+maintainers:
+  - David Wronek <david@mainlining.org>
+
+description:
+  The Raydium RM69380 is a generic DSI panel IC used to control
+  OLED panels.
+
+allOf:
+  - $ref: panel-common-dual.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - lenovo,j716f-edo-rm69380
+      - const: raydium,rm69380
+    description: This indicates the panel manufacturer of the panel
+      that is in turn using the RM69380 panel driver. The compatible
+      string determines how the RM69380 panel driver shall be configured
+      to work with the indicated panel. The raydium,rm69380 compatible shall
+      always be provided as a fallback.
+
+  avdd-supply:
+    description: Analog voltage rail
+
+  vddio-supply:
+    description: I/O voltage rail
+
+  reset-gpios:
+    maxItems: 1
+    description: phandle of gpio for reset line - This should be active low
+
+  ports: true
+  reg: true
+
+required:
+  - compatible
+  - reg
+  - avdd-supply
+  - vddio-supply
+  - reset-gpios
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "lenovo,j716f-edo-rm69380", "raydium,rm69380";
+            reg = <0>;
+
+            avdd-supply = <&panel_avdd_regulator>;
+            vddio-supply = <&vreg_l14a>;
+            reset-gpios = <&tlmm 75 GPIO_ACTIVE_LOW>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    panel_in_0: endpoint {
+                        remote-endpoint = <&mdss_dsi0_out>;
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+                    panel_in_1: endpoint {
+                        remote-endpoint = <&mdss_dsi1_out>;
+                    };
+                };
+            };
+        };
+    };
+
+...

-- 
2.44.0

Re: [PATCH v3 1/2] dt-bindings: display: panel: Add Raydium RM69380

[Rob Herring]

On Tue, 16 Apr 2024 20:30:48 +0200, David Wronek wrote:
> Raydium RM69380 is a display driver IC used to drive OLED DSI panels.
> Add a dt-binding for it.
> 
> Signed-off-by: David Wronek <david@mainlining.org>
> ---
> Note:
> Depends on commit 48a516363e29 ("dt-bindings: display: panel: add common dual-link schema")
> ---
>  .../bindings/display/panel/raydium,rm69380.yaml    | 91 ++++++++++++++++++++++
>  1 file changed, 91 insertions(+)
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/raydium,rm69380.yaml:
Error in referenced schema matching $id: http://devicetree.org/schemas/display/panel/panel-common-dual.yaml
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/display/panel/raydium,rm69380.example.dtb: panel@0: False schema does not allow {'compatible': ['lenovo,j716f-edo-rm69380', 'raydium,rm69380'], 'reg': [[0]], 'avdd-supply': [[4294967295]], 'vddio-supply': [[4294967295]], 'reset-gpios': [[4294967295, 75, 1]], 'ports': {'#address-cells': [[1]], '#size-cells': [[0]], 'port@0': {'reg': [[0]], 'endpoint': {'remote-endpoint': [[4294967295]]}}, 'port@1': {'reg': [[1]], 'endpoint': {'remote-endpoint': [[4294967295]]}}}, '$nodename': ['panel@0']}
	from schema $id: http://devicetree.org/schemas/display/panel/raydium,rm69380.yaml#

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20240416-raydium-rm69380-driver-v3-1-21600ac4ce5f@mainlining.org

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

Re: [PATCH v3 1/2] dt-bindings: display: panel: Add Raydium RM69380

[Rob Herring]

On Tue, Apr 16, 2024 at 08:30:48PM +0200, David Wronek wrote:
> Raydium RM69380 is a display driver IC used to drive OLED DSI panels.
> Add a dt-binding for it.
> 
> Signed-off-by: David Wronek <david@mainlining.org>
> ---
> Note:
> Depends on commit 48a516363e29 ("dt-bindings: display: panel: add common dual-link schema")
> ---
>  .../bindings/display/panel/raydium,rm69380.yaml    | 91 ++++++++++++++++++++++
>  1 file changed, 91 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/raydium,rm69380.yaml b/Documentation/devicetree/bindings/display/panel/raydium,rm69380.yaml
> new file mode 100644
> index 000000000000..0ac7d033cbe0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/raydium,rm69380.yaml
> @@ -0,0 +1,91 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/panel/raydium,rm69380.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Raydium RM6380-based DSI display panels

RM69380-based

> +
> +maintainers:
> +  - David Wronek <david@mainlining.org>
> +
> +description:
> +  The Raydium RM69380 is a generic DSI panel IC used to control
> +  OLED panels.
> +
> +allOf:
> +  - $ref: panel-common-dual.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - lenovo,j716f-edo-rm69380
> +      - const: raydium,rm69380
> +    description: This indicates the panel manufacturer of the panel
> +      that is in turn using the RM69380 panel driver. The compatible
> +      string determines how the RM69380 panel driver shall be configured
> +      to work with the indicated panel. The raydium,rm69380 compatible shall
> +      always be provided as a fallback.
> +
> +  avdd-supply:
> +    description: Analog voltage rail
> +
> +  vddio-supply:
> +    description: I/O voltage rail
> +
> +  reset-gpios:
> +    maxItems: 1
> +    description: phandle of gpio for reset line - This should be active low
> +
> +  ports: true
> +  reg: true

Drop these and change 'addtionalProperties' to 'unevaluatedProperties'. 
Other properties in panel-common.yaml should be allowed. width-mm and 
height-mm for example.

> +
> +required:
> +  - compatible
> +  - reg
> +  - avdd-supply
> +  - vddio-supply
> +  - reset-gpios

> +  - ports

Already required in panel-common-dual.yaml.

Rob

[PATCH v3 2/2] drm/panel: Add driver for EDO RM69380 OLED panel

[David Wronek]

Add support for the 2560x1600@90Hz OLED panel by EDO bundled with a
Raydium RM69380 controller, as found on the Lenovo Xiaoxin Pad Pro 2021.

Signed-off-by: David Wronek <david@mainlining.org>
---
 drivers/gpu/drm/panel/Kconfig                 |  14 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-raydium-rm69380.c | 367 ++++++++++++++++++++++++++
 3 files changed, 382 insertions(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 154f5bf82980..5b3eeb93b1a2 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -542,6 +542,20 @@ config DRM_PANEL_RAYDIUM_RM692E5
 	  Say Y here if you want to enable support for Raydium RM692E5-based
 	  display panels, such as the one found in the Fairphone 5 smartphone.
 
+config DRM_PANEL_RAYDIUM_RM69380
+	tristate "Raydium RM69380-based DSI panel"
+	depends on BACKLIGHT_CLASS_DEVICE
+	depends on DRM_DISPLAY_DP_HELPER
+	depends on DRM_DISPLAY_HELPER
+	depends on DRM_MIPI_DSI
+	depends on OF
+	help
+	  Say Y here if you want to enable support for Raydium RM69380-based
+	  display panels.
+
+	  This panel controller can be found in the Lenovo Xiaoxin Pad Pro 2021
+	  in combination with an EDO OLED panel.
+
 config DRM_PANEL_RONBO_RB070D30
 	tristate "Ronbo Electronics RB070D30 panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 24a02655d726..e2a2807d4ef0 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen
 obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM67191) += panel-raydium-rm67191.o
 obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
 obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM692E5) += panel-raydium-rm692e5.o
+obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM69380) += panel-raydium-rm69380.o
 obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o
diff --git a/drivers/gpu/drm/panel/panel-raydium-rm69380.c b/drivers/gpu/drm/panel/panel-raydium-rm69380.c
new file mode 100644
index 000000000000..f89230c969b7
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-raydium-rm69380.c
@@ -0,0 +1,367 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree.
+ * Copyright (c) 2024 David Wronek <david@mainlining.org>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.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 rm69380_panel {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi[2];
+	struct regulator_bulk_data supplies[2];
+	struct gpio_desc *reset_gpio;
+};
+
+static inline
+struct rm69380_panel *to_rm69380_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct rm69380_panel, panel);
+}
+
+static void rm69380_reset(struct rm69380_panel *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(15000, 16000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 11000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	msleep(30);
+}
+
+static int rm69380_on(struct rm69380_panel *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi[0];
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+	if (ctx->dsi[1])
+		ctx->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0xd4);
+	mipi_dsi_dcs_write_seq(dsi, 0x00, 0x80);
+	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0xd0);
+	mipi_dsi_dcs_write_seq(dsi, 0x48, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x26);
+	mipi_dsi_dcs_write_seq(dsi, 0x75, 0x3f);
+	mipi_dsi_dcs_write_seq(dsi, 0x1d, 0x1a);
+	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x28);
+	mipi_dsi_dcs_write_seq(dsi, 0xc2, 0x08);
+
+	ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set tear on: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_display_brightness(dsi, 0x7ff);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display brightness: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
+		return ret;
+	}
+	msleep(20);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display on: %d\n", ret);
+		return ret;
+	}
+	msleep(36);
+
+	return 0;
+}
+
+static int rm69380_off(struct rm69380_panel *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi[0];
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+	if (ctx->dsi[1])
+		ctx->dsi[1]->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_off(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display off: %d\n", ret);
+		return ret;
+	}
+	msleep(35);
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
+		return ret;
+	}
+	msleep(20);
+
+	return 0;
+}
+
+static int rm69380_prepare(struct drm_panel *panel)
+{
+	struct rm69380_panel *ctx = to_rm69380_panel(panel);
+	struct device *dev = &ctx->dsi[0]->dev;
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	rm69380_reset(ctx);
+
+	ret = rm69380_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rm69380_unprepare(struct drm_panel *panel)
+{
+	struct rm69380_panel *ctx = to_rm69380_panel(panel);
+	struct device *dev = &ctx->dsi[0]->dev;
+	int ret;
+
+	ret = rm69380_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+
+	return 0;
+}
+
+static const struct drm_display_mode rm69380_mode = {
+	.clock = (2560 + 32 + 12 + 38) * (1600 + 20 + 4 + 8) * 90 / 1000,
+	.hdisplay = 2560,
+	.hsync_start = 2560 + 32,
+	.hsync_end = 2560 + 32 + 12,
+	.htotal = 2560 + 32 + 12 + 38,
+	.vdisplay = 1600,
+	.vsync_start = 1600 + 20,
+	.vsync_end = 1600 + 20 + 4,
+	.vtotal = 1600 + 20 + 4 + 8,
+	.width_mm = 248,
+	.height_mm = 155,
+	.type = DRM_MODE_TYPE_DRIVER,
+};
+
+static int rm69380_get_modes(struct drm_panel *panel,
+					struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector, &rm69380_mode);
+}
+
+static const struct drm_panel_funcs rm69380_panel_funcs = {
+	.prepare = rm69380_prepare,
+	.unprepare = rm69380_unprepare,
+	.get_modes = rm69380_get_modes,
+};
+
+static int rm69380_bl_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness = backlight_get_brightness(bl);
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int rm69380_bl_get_brightness(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness;
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return brightness;
+}
+
+static const struct backlight_ops rm69380_bl_ops = {
+	.update_status = rm69380_bl_update_status,
+	.get_brightness = rm69380_bl_get_brightness,
+};
+
+static struct backlight_device *
+rm69380_create_backlight(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	const struct backlight_properties props = {
+		.type = BACKLIGHT_RAW,
+		.brightness = 2047,
+		.max_brightness = 2047,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &rm69380_bl_ops, &props);
+}
+
+static int rm69380_probe(struct mipi_dsi_device *dsi)
+{
+	struct mipi_dsi_host *dsi_sec_host;
+	struct rm69380_panel *ctx;
+	struct device *dev = &dsi->dev;
+	struct device_node *dsi_sec;
+	int ret, i;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->supplies[0].supply = "vddio";
+	ctx->supplies[1].supply = "avdd";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
+				      ctx->supplies);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to get regulators\n");
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+				     "Failed to get reset-gpios\n");
+
+	dsi_sec = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
+
+	if (dsi_sec) {
+		const struct mipi_dsi_device_info info = { "RM69380", 0,
+							   dsi_sec };
+
+		dev_dbg(dev, "Using Dual-DSI: found `%s`\n", dsi_sec->name);
+
+		dsi_sec_host = of_find_mipi_dsi_host_by_node(dsi_sec);
+		of_node_put(dsi_sec);
+		if (!dsi_sec_host)
+			return dev_err_probe(dev, -EPROBE_DEFER,
+					     "Cannot get secondary DSI host\n");
+
+		ctx->dsi[1] =
+			devm_mipi_dsi_device_register_full(dev, dsi_sec_host, &info);
+		if (IS_ERR(ctx->dsi[1]))
+			return dev_err_probe(dev, PTR_ERR(ctx->dsi[1]),
+					     "Cannot get secondary DSI node\n");
+
+		dev_dbg(dev, "Second DSI name `%s`\n", ctx->dsi[1]->name);
+		mipi_dsi_set_drvdata(ctx->dsi[1], ctx);
+	} else {
+		dev_dbg(dev, "Using Single-DSI\n");
+	}
+
+	ctx->dsi[0] = dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	drm_panel_init(&ctx->panel, dev, &rm69380_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.prepare_prev_first = true;
+
+	ctx->panel.backlight = rm69380_create_backlight(dsi);
+	if (IS_ERR(ctx->panel.backlight))
+		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
+				     "Failed to create backlight\n");
+
+	drm_panel_add(&ctx->panel);
+
+	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
+		if (!ctx->dsi[i])
+			continue;
+
+		dev_dbg(&ctx->dsi[i]->dev, "Binding DSI %d\n", i);
+
+		ctx->dsi[i]->lanes = 4;
+		ctx->dsi[i]->format = MIPI_DSI_FMT_RGB888;
+		ctx->dsi[i]->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
+					  MIPI_DSI_CLOCK_NON_CONTINUOUS;
+
+		ret = mipi_dsi_attach(ctx->dsi[i]);
+		if (ret < 0) {
+			mipi_dsi_detach(ctx->dsi[i]);
+			drm_panel_remove(&ctx->panel);
+			return dev_err_probe(dev, ret,
+					     "Failed to attach to DSI%d\n", i);
+		}
+	}
+
+	return 0;
+}
+
+static void rm69380_remove(struct mipi_dsi_device *dsi)
+{
+	struct rm69380_panel *ctx = mipi_dsi_get_drvdata(dsi);
+	int i;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
+		if (!ctx->dsi[i])
+			continue;
+
+		ret = mipi_dsi_detach(ctx->dsi[i]);
+		if (ret < 0)
+			dev_err(&dsi->dev, "Failed to detach from DSI%d host: %d\n", i, ret);
+	}
+
+	drm_panel_remove(&ctx->panel);
+}
+
+static const struct of_device_id rm69380_of_match[] = {
+	{ .compatible = "lenovo,j716f-edo-rm69380" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rm69380_of_match);
+
+static struct mipi_dsi_driver rm69380_panel_driver = {
+	.probe = rm69380_probe,
+	.remove = rm69380_remove,
+	.driver = {
+		.name = "panel-raydium-rm69380",
+		.of_match_table = rm69380_of_match,
+	},
+};
+module_mipi_dsi_driver(rm69380_panel_driver);
+
+MODULE_AUTHOR("David Wronek <david@mainlining.org");
+MODULE_DESCRIPTION("DRM driver for Raydium RM69380-equipped DSI panels");
+MODULE_LICENSE("GPL");

-- 
2.44.0

Re: [PATCH v3 2/2] drm/panel: Add driver for EDO RM69380 OLED panel

[Dmitry Baryshkov]

On Tue, Apr 16, 2024 at 08:30:49PM +0200, David Wronek wrote:
> Add support for the 2560x1600@90Hz OLED panel by EDO bundled with a
> Raydium RM69380 controller, as found on the Lenovo Xiaoxin Pad Pro 2021.
> 
> Signed-off-by: David Wronek <david@mainlining.org>
> ---
>  drivers/gpu/drm/panel/Kconfig                 |  14 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  drivers/gpu/drm/panel/panel-raydium-rm69380.c | 367 ++++++++++++++++++++++++++
>  3 files changed, 382 insertions(+)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry

Re: [PATCH v3 2/2] drm/panel: Add driver for EDO RM69380 OLED panel

[Christophe JAILLET]

Le 16/04/2024 à 20:30, David Wronek a écrit :
> Add support for the 2560x1600@90Hz OLED panel by EDO bundled with a
> Raydium RM69380 controller, as found on the Lenovo Xiaoxin Pad Pro 2021.
> 
> Signed-off-by: David Wronek <david-vu3DzTD92ROXwddmVfQv5g@public.gmane.org>
> ---
>   drivers/gpu/drm/panel/Kconfig                 |  14 +
>   drivers/gpu/drm/panel/Makefile                |   1 +
>   drivers/gpu/drm/panel/panel-raydium-rm69380.c | 367 ++++++++++++++++++++++++++
>   3 files changed, 382 insertions(+)
> 

...

> +static int rm69380_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct mipi_dsi_host *dsi_sec_host;
> +	struct rm69380_panel *ctx;
> +	struct device *dev = &dsi->dev;
> +	struct device_node *dsi_sec;
> +	int ret, i;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->supplies[0].supply = "vddio";
> +	ctx->supplies[1].supply = "avdd";
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> +				      ctx->supplies);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "Failed to get regulators\n");
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(ctx->reset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
> +				     "Failed to get reset-gpios\n");
> +
> +	dsi_sec = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
> +
> +	if (dsi_sec) {
> +		const struct mipi_dsi_device_info info = { "RM69380", 0,
> +							   dsi_sec };
> +
> +		dev_dbg(dev, "Using Dual-DSI: found `%s`\n", dsi_sec->name);
> +
> +		dsi_sec_host = of_find_mipi_dsi_host_by_node(dsi_sec);
> +		of_node_put(dsi_sec);
> +		if (!dsi_sec_host)
> +			return dev_err_probe(dev, -EPROBE_DEFER,
> +					     "Cannot get secondary DSI host\n");
> +
> +		ctx->dsi[1] =
> +			devm_mipi_dsi_device_register_full(dev, dsi_sec_host, &info);
> +		if (IS_ERR(ctx->dsi[1]))
> +			return dev_err_probe(dev, PTR_ERR(ctx->dsi[1]),
> +					     "Cannot get secondary DSI node\n");
> +
> +		dev_dbg(dev, "Second DSI name `%s`\n", ctx->dsi[1]->name);
> +		mipi_dsi_set_drvdata(ctx->dsi[1], ctx);
> +	} else {
> +		dev_dbg(dev, "Using Single-DSI\n");
> +	}
> +
> +	ctx->dsi[0] = dsi;
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	drm_panel_init(&ctx->panel, dev, &rm69380_panel_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +	ctx->panel.prepare_prev_first = true;
> +
> +	ctx->panel.backlight = rm69380_create_backlight(dsi);
> +	if (IS_ERR(ctx->panel.backlight))
> +		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
> +				     "Failed to create backlight\n");
> +
> +	drm_panel_add(&ctx->panel);
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
> +		if (!ctx->dsi[i])
> +			continue;
> +
> +		dev_dbg(&ctx->dsi[i]->dev, "Binding DSI %d\n", i);
> +
> +		ctx->dsi[i]->lanes = 4;
> +		ctx->dsi[i]->format = MIPI_DSI_FMT_RGB888;
> +		ctx->dsi[i]->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
> +					  MIPI_DSI_CLOCK_NON_CONTINUOUS;
> +
> +		ret = mipi_dsi_attach(ctx->dsi[i]);
> +		if (ret < 0) {
> +			mipi_dsi_detach(ctx->dsi[i]);

I don't think this works.
if 'i' fails, you have to detach 0...i-1

maybe something like below (complety untested).

> +			drm_panel_remove(&ctx->panel);
> +			return dev_err_probe(dev, ret,
> +					     "Failed to attach to DSI%d\n", i);
> +		}
> +	}
> +
> +	return 0;
> +}


	drm_panel_add(&ctx->panel);

	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
		if (!ctx->dsi[i])
			continue;

		dev_dbg(&ctx->dsi[i]->dev, "Binding DSI %d\n", i);

		ctx->dsi[i]->lanes = 4;
		ctx->dsi[i]->format = MIPI_DSI_FMT_RGB888;
		ctx->dsi[i]->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
					  MIPI_DSI_CLOCK_NON_CONTINUOUS;

		ret = mipi_dsi_attach(ctx->dsi[i]);
		if (ret < 0) {
			dev_err_probe(dev, ret,
				      "Failed to attach to DSI%d\n", i);
			goto err_detach_dsi;
		}
	}

	return 0;

err_detach_dsi:
	while (--i >= 0)
		if (ctx->dsi[i])
			mipi_dsi_detach(ctx->dsi[i]);

	drm_panel_remove(&ctx->panel);

	return ret;
}

Re: [PATCH v3 2/2] drm/panel: Add driver for EDO RM69380 OLED panel

[Marijn Suijten]

On 2024-04-16 20:30:49, David Wronek wrote:
> Add support for the 2560x1600@90Hz OLED panel by EDO bundled with a
> Raydium RM69380 controller, as found on the Lenovo Xiaoxin Pad Pro 2021.
> 
> Signed-off-by: David Wronek <david@mainlining.org>
> ---
>  drivers/gpu/drm/panel/Kconfig                 |  14 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  drivers/gpu/drm/panel/panel-raydium-rm69380.c | 367 ++++++++++++++++++++++++++
>  3 files changed, 382 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 154f5bf82980..5b3eeb93b1a2 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -542,6 +542,20 @@ config DRM_PANEL_RAYDIUM_RM692E5
>  	  Say Y here if you want to enable support for Raydium RM692E5-based
>  	  display panels, such as the one found in the Fairphone 5 smartphone.
>  
> +config DRM_PANEL_RAYDIUM_RM69380
> +	tristate "Raydium RM69380-based DSI panel"
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	depends on DRM_DISPLAY_DP_HELPER

"DRM DisplayPort helpers"

But you said that this is a DSI device?

Looking in -next from yesterday, Raydium-RM692E5 and Visionox-R66451 get this
wrong as well.

> +	depends on DRM_DISPLAY_HELPER

This also looks unused?  The only helpers in the non-DP non-HDMI helper points
to more DP AUX code.

> +	depends on DRM_MIPI_DSI
> +	depends on OF

As I've shown in the SOFEF00 cleanup patch, devm_gpiod_get() is used which is
behind GPIOLIB.  This should probably be a dependency.

> +	help
> +	  Say Y here if you want to enable support for Raydium RM69380-based
> +	  display panels.
> +
> +	  This panel controller can be found in the Lenovo Xiaoxin Pad Pro 2021
> +	  in combination with an EDO OLED panel.
> +
>  config DRM_PANEL_RONBO_RB070D30
>  	tristate "Ronbo Electronics RB070D30 panel"
>  	depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 24a02655d726..e2a2807d4ef0 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -55,6 +55,7 @@ obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen
>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM67191) += panel-raydium-rm67191.o
>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM692E5) += panel-raydium-rm692e5.o
> +obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM69380) += panel-raydium-rm69380.o
>  obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o
> diff --git a/drivers/gpu/drm/panel/panel-raydium-rm69380.c b/drivers/gpu/drm/panel/panel-raydium-rm69380.c
> new file mode 100644
> index 000000000000..f89230c969b7
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-raydium-rm69380.c
> @@ -0,0 +1,367 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree.
> + * Copyright (c) 2024 David Wronek <david@mainlining.org>
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.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 rm69380_panel {
> +	struct drm_panel panel;
> +	struct mipi_dsi_device *dsi[2];
> +	struct regulator_bulk_data supplies[2];
> +	struct gpio_desc *reset_gpio;
> +};
> +
> +static inline
> +struct rm69380_panel *to_rm69380_panel(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct rm69380_panel, panel);
> +}
> +
> +static void rm69380_reset(struct rm69380_panel *ctx)
> +{
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	usleep_range(15000, 16000);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +	usleep_range(10000, 11000);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	msleep(30);
> +}
> +
> +static int rm69380_on(struct rm69380_panel *ctx)
> +{
> +	struct mipi_dsi_device *dsi = ctx->dsi[0];
> +	struct device *dev = &dsi->dev;
> +	int ret;
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +	if (ctx->dsi[1])
> +		ctx->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0xd4);
> +	mipi_dsi_dcs_write_seq(dsi, 0x00, 0x80);

Is this MIPI_DCS_NOP?  Strange to see that with a parameter.

> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0xd0);
> +	mipi_dsi_dcs_write_seq(dsi, 0x48, 0x00);
> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x26);
> +	mipi_dsi_dcs_write_seq(dsi, 0x75, 0x3f);
> +	mipi_dsi_dcs_write_seq(dsi, 0x1d, 0x1a);
> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00);
> +	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x28);

Separate from this patch, I feel like we should document these bits.  Their
meaning might be defined by a paywall, intersecting a few downstream DTS with
DCS commands makes it instantly clear what each bit means.

> +	mipi_dsi_dcs_write_seq(dsi, 0xc2, 0x08);
> +
> +	ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set tear on: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = mipi_dsi_dcs_set_display_brightness(dsi, 0x7ff);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set display brightness: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(20);
> +
> +	ret = mipi_dsi_dcs_set_display_on(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set display on: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(36);
> +
> +	return 0;
> +}
> +
> +static int rm69380_off(struct rm69380_panel *ctx)
> +{
> +	struct mipi_dsi_device *dsi = ctx->dsi[0];
> +	struct device *dev = &dsi->dev;
> +	int ret;
> +
> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +	if (ctx->dsi[1])
> +		ctx->dsi[1]->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_set_display_off(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set display off: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(35);
> +
> +	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(20);
> +
> +	return 0;
> +}
> +
> +static int rm69380_prepare(struct drm_panel *panel)
> +{
> +	struct rm69380_panel *ctx = to_rm69380_panel(panel);
> +	struct device *dev = &ctx->dsi[0]->dev;
> +	int ret;
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable regulators: %d\n", ret);
> +		return ret;
> +	}
> +
> +	rm69380_reset(ctx);
> +
> +	ret = rm69380_on(ctx);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to initialize panel: %d\n", ret);
> +		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int rm69380_unprepare(struct drm_panel *panel)
> +{
> +	struct rm69380_panel *ctx = to_rm69380_panel(panel);
> +	struct device *dev = &ctx->dsi[0]->dev;
> +	int ret;
> +
> +	ret = rm69380_off(ctx);
> +	if (ret < 0)
> +		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
> +
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +
> +	return 0;
> +}
> +
> +static const struct drm_display_mode rm69380_mode = {
> +	.clock = (2560 + 32 + 12 + 38) * (1600 + 20 + 4 + 8) * 90 / 1000,
> +	.hdisplay = 2560,
> +	.hsync_start = 2560 + 32,
> +	.hsync_end = 2560 + 32 + 12,
> +	.htotal = 2560 + 32 + 12 + 38,
> +	.vdisplay = 1600,
> +	.vsync_start = 1600 + 20,
> +	.vsync_end = 1600 + 20 + 4,
> +	.vtotal = 1600 + 20 + 4 + 8,
> +	.width_mm = 248,
> +	.height_mm = 155,
> +	.type = DRM_MODE_TYPE_DRIVER,
> +};
> +
> +static int rm69380_get_modes(struct drm_panel *panel,
> +					struct drm_connector *connector)
> +{
> +	return drm_connector_helper_get_modes_fixed(connector, &rm69380_mode);
> +}
> +
> +static const struct drm_panel_funcs rm69380_panel_funcs = {
> +	.prepare = rm69380_prepare,
> +	.unprepare = rm69380_unprepare,
> +	.get_modes = rm69380_get_modes,
> +};
> +
> +static int rm69380_bl_update_status(struct backlight_device *bl)
> +{
> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
> +	u16 brightness = backlight_get_brightness(bl);
> +	int ret;
> +
> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
> +	if (ret < 0)
> +		return ret;
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	return 0;
> +}
> +
> +static int rm69380_bl_get_brightness(struct backlight_device *bl)
> +{
> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
> +	u16 brightness;
> +	int ret;
> +
> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
> +	if (ret < 0)
> +		return ret;
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	return brightness;
> +}
> +
> +static const struct backlight_ops rm69380_bl_ops = {
> +	.update_status = rm69380_bl_update_status,
> +	.get_brightness = rm69380_bl_get_brightness,
> +};
> +
> +static struct backlight_device *
> +rm69380_create_backlight(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	const struct backlight_properties props = {
> +		.type = BACKLIGHT_RAW,
> +		.brightness = 2047,

Might be nice to reduce the init brightness to something lower, like 1023 or
511?  But also drop the brightness call in _on().

> +		.max_brightness = 2047,
> +	};
> +
> +	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
> +					      &rm69380_bl_ops, &props);
> +}
> +
> +static int rm69380_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct mipi_dsi_host *dsi_sec_host;
> +	struct rm69380_panel *ctx;
> +	struct device *dev = &dsi->dev;
> +	struct device_node *dsi_sec;
> +	int ret, i;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->supplies[0].supply = "vddio";
> +	ctx->supplies[1].supply = "avdd";
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> +				      ctx->supplies);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "Failed to get regulators\n");
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(ctx->reset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
> +				     "Failed to get reset-gpios\n");
> +
> +	dsi_sec = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
> +
> +	if (dsi_sec) {
> +		const struct mipi_dsi_device_info info = { "RM69380", 0,
> +							   dsi_sec };
> +
> +		dev_dbg(dev, "Using Dual-DSI: found `%s`\n", dsi_sec->name);
> +
> +		dsi_sec_host = of_find_mipi_dsi_host_by_node(dsi_sec);
> +		of_node_put(dsi_sec);
> +		if (!dsi_sec_host)
> +			return dev_err_probe(dev, -EPROBE_DEFER,
> +					     "Cannot get secondary DSI host\n");
> +
> +		ctx->dsi[1] =
> +			devm_mipi_dsi_device_register_full(dev, dsi_sec_host, &info);
> +		if (IS_ERR(ctx->dsi[1]))
> +			return dev_err_probe(dev, PTR_ERR(ctx->dsi[1]),
> +					     "Cannot get secondary DSI node\n");
> +
> +		dev_dbg(dev, "Second DSI name `%s`\n", ctx->dsi[1]->name);

Let's drop my debug logs :)

> +		mipi_dsi_set_drvdata(ctx->dsi[1], ctx);
> +	} else {
> +		dev_dbg(dev, "Using Single-DSI\n");
> +	}
> +
> +	ctx->dsi[0] = dsi;
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	drm_panel_init(&ctx->panel, dev, &rm69380_panel_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +	ctx->panel.prepare_prev_first = true;
> +
> +	ctx->panel.backlight = rm69380_create_backlight(dsi);
> +	if (IS_ERR(ctx->panel.backlight))
> +		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
> +				     "Failed to create backlight\n");
> +
> +	drm_panel_add(&ctx->panel);
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
> +		if (!ctx->dsi[i])
> +			continue;
> +
> +		dev_dbg(&ctx->dsi[i]->dev, "Binding DSI %d\n", i);

Probably not very useful?

> +
> +		ctx->dsi[i]->lanes = 4;
> +		ctx->dsi[i]->format = MIPI_DSI_FMT_RGB888;
> +		ctx->dsi[i]->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
> +					  MIPI_DSI_CLOCK_NON_CONTINUOUS;
> +
> +		ret = mipi_dsi_attach(ctx->dsi[i]);
> +		if (ret < 0) {
> +			mipi_dsi_detach(ctx->dsi[i]);

This isn't sound as written.  If attaching fails, it is likely an error to
detach the same DSI device.

The error scenario that Christophe pointed out is when attaching dsi[1]
fails, in this case you have to detach dsi[0].  But as written in late v2
review, instead of making complicated logic statements there is a matching
devm_mipi_dsi_attach() to handle these cleanup scenarios for you.  This should
also remove the need for mipi_dsi_attach() in the _remove function.

- Marijn

> +			drm_panel_remove(&ctx->panel);
> +			return dev_err_probe(dev, ret,
> +					     "Failed to attach to DSI%d\n", i);
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static void rm69380_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct rm69380_panel *ctx = mipi_dsi_get_drvdata(dsi);
> +	int i;
> +	int ret;
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
> +		if (!ctx->dsi[i])
> +			continue;
> +
> +		ret = mipi_dsi_detach(ctx->dsi[i]);
> +		if (ret < 0)
> +			dev_err(&dsi->dev, "Failed to detach from DSI%d host: %d\n", i, ret);
> +	}
> +
> +	drm_panel_remove(&ctx->panel);
> +}
> +
> +static const struct of_device_id rm69380_of_match[] = {
> +	{ .compatible = "lenovo,j716f-edo-rm69380" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, rm69380_of_match);
> +
> +static struct mipi_dsi_driver rm69380_panel_driver = {
> +	.probe = rm69380_probe,
> +	.remove = rm69380_remove,
> +	.driver = {
> +		.name = "panel-raydium-rm69380",
> +		.of_match_table = rm69380_of_match,
> +	},
> +};
> +module_mipi_dsi_driver(rm69380_panel_driver);
> +
> +MODULE_AUTHOR("David Wronek <david@mainlining.org");
> +MODULE_DESCRIPTION("DRM driver for Raydium RM69380-equipped DSI panels");
> +MODULE_LICENSE("GPL");
> 
> -- 
> 2.44.0
> 

Re: [PATCH v3 2/2] drm/panel: Add driver for EDO RM69380 OLED panel

[David Wronek]

W dniu 2024-04-16 22:52, Marijn Suijten napisał(a):
> On 2024-04-16 20:30:49, David Wronek wrote:
>> Add support for the 2560x1600@90Hz OLED panel by EDO bundled with a
>> Raydium RM69380 controller, as found on the Lenovo Xiaoxin Pad Pro 
>> 2021.
>> 
>> Signed-off-by: David Wronek <david@mainlining.org>
>> ---
>>  drivers/gpu/drm/panel/Kconfig                 |  14 +
>>  drivers/gpu/drm/panel/Makefile                |   1 +
>>  drivers/gpu/drm/panel/panel-raydium-rm69380.c | 367 
>> ++++++++++++++++++++++++++
>>  3 files changed, 382 insertions(+)
>> 
>> diff --git a/drivers/gpu/drm/panel/Kconfig 
>> b/drivers/gpu/drm/panel/Kconfig
>> index 154f5bf82980..5b3eeb93b1a2 100644
>> --- a/drivers/gpu/drm/panel/Kconfig
>> +++ b/drivers/gpu/drm/panel/Kconfig
>> @@ -542,6 +542,20 @@ config DRM_PANEL_RAYDIUM_RM692E5
>>  	  Say Y here if you want to enable support for Raydium RM692E5-based
>>  	  display panels, such as the one found in the Fairphone 5 
>> smartphone.
>> 
>> +config DRM_PANEL_RAYDIUM_RM69380
>> +	tristate "Raydium RM69380-based DSI panel"
>> +	depends on BACKLIGHT_CLASS_DEVICE
>> +	depends on DRM_DISPLAY_DP_HELPER
> 
> "DRM DisplayPort helpers"
> 
> But you said that this is a DSI device?
> 
> Looking in -next from yesterday, Raydium-RM692E5 and Visionox-R66451 
> get this
> wrong as well.
> 
>> +	depends on DRM_DISPLAY_HELPER
> 
> This also looks unused?  The only helpers in the non-DP non-HDMI helper 
> points
> to more DP AUX code.
> 
>> +	depends on DRM_MIPI_DSI
>> +	depends on OF
> 
> As I've shown in the SOFEF00 cleanup patch, devm_gpiod_get() is used 
> which is
> behind GPIOLIB.  This should probably be a dependency.
> 
>> +	help
>> +	  Say Y here if you want to enable support for Raydium RM69380-based
>> +	  display panels.
>> +
>> +	  This panel controller can be found in the Lenovo Xiaoxin Pad Pro 
>> 2021
>> +	  in combination with an EDO OLED panel.
>> +
>>  config DRM_PANEL_RONBO_RB070D30
>>  	tristate "Ronbo Electronics RB070D30 panel"
>>  	depends on OF
>> diff --git a/drivers/gpu/drm/panel/Makefile 
>> b/drivers/gpu/drm/panel/Makefile
>> index 24a02655d726..e2a2807d4ef0 100644
>> --- a/drivers/gpu/drm/panel/Makefile
>> +++ b/drivers/gpu/drm/panel/Makefile
>> @@ -55,6 +55,7 @@ obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += 
>> panel-raspberrypi-touchscreen
>>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM67191) += panel-raydium-rm67191.o
>>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
>>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM692E5) += panel-raydium-rm692e5.o
>> +obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM69380) += panel-raydium-rm69380.o
>>  obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o
>>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += 
>> panel-samsung-atna33xc20.o
>>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o
>> diff --git a/drivers/gpu/drm/panel/panel-raydium-rm69380.c 
>> b/drivers/gpu/drm/panel/panel-raydium-rm69380.c
>> new file mode 100644
>> index 000000000000..f89230c969b7
>> --- /dev/null
>> +++ b/drivers/gpu/drm/panel/panel-raydium-rm69380.c
>> @@ -0,0 +1,367 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Generated with linux-mdss-dsi-panel-driver-generator from vendor 
>> device tree.
>> + * Copyright (c) 2024 David Wronek <david@mainlining.org>
>> + */
>> +
>> +#include <linux/backlight.h>
>> +#include <linux/delay.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_graph.h>
>> +#include <linux/regulator/consumer.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 rm69380_panel {
>> +	struct drm_panel panel;
>> +	struct mipi_dsi_device *dsi[2];
>> +	struct regulator_bulk_data supplies[2];
>> +	struct gpio_desc *reset_gpio;
>> +};
>> +
>> +static inline
>> +struct rm69380_panel *to_rm69380_panel(struct drm_panel *panel)
>> +{
>> +	return container_of(panel, struct rm69380_panel, panel);
>> +}
>> +
>> +static void rm69380_reset(struct rm69380_panel *ctx)
>> +{
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>> +	usleep_range(15000, 16000);
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +	usleep_range(10000, 11000);
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>> +	msleep(30);
>> +}
>> +
>> +static int rm69380_on(struct rm69380_panel *ctx)
>> +{
>> +	struct mipi_dsi_device *dsi = ctx->dsi[0];
>> +	struct device *dev = &dsi->dev;
>> +	int ret;
>> +
>> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
>> +	if (ctx->dsi[1])
>> +		ctx->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
>> +
>> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0xd4);
>> +	mipi_dsi_dcs_write_seq(dsi, 0x00, 0x80);
> 
> Is this MIPI_DCS_NOP?  Strange to see that with a parameter.
> 

I don't think it is. 0xfe is the command to switch the 'manufacture 
command set'. As you can see, it switches to a different MCS right after 
this one. Given that I don't have a datasheet for this perticular driver 
IC, I can't be absolutely certain, but considering that the drivers for 
rm67191 and rm68200 are defining 0xfe as the command to switch the 
commands sets, it's probably the same here.

>> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0xd0);
>> +	mipi_dsi_dcs_write_seq(dsi, 0x48, 0x00);
>> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x26);
>> +	mipi_dsi_dcs_write_seq(dsi, 0x75, 0x3f);
>> +	mipi_dsi_dcs_write_seq(dsi, 0x1d, 0x1a);
>> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00);
>> +	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x28);
> 
> Separate from this patch, I feel like we should document these bits.  
> Their
> meaning might be defined by a paywall, intersecting a few downstream 
> DTS with
> DCS commands makes it instantly clear what each bit means.
> 
>> +	mipi_dsi_dcs_write_seq(dsi, 0xc2, 0x08);
>> +
>> +	ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to set tear on: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = mipi_dsi_dcs_set_display_brightness(dsi, 0x7ff);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to set display brightness: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
>> +		return ret;
>> +	}
>> +	msleep(20);
>> +
>> +	ret = mipi_dsi_dcs_set_display_on(dsi);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to set display on: %d\n", ret);
>> +		return ret;
>> +	}
>> +	msleep(36);
>> +
>> +	return 0;
>> +}
>> +
>> +static int rm69380_off(struct rm69380_panel *ctx)
>> +{
>> +	struct mipi_dsi_device *dsi = ctx->dsi[0];
>> +	struct device *dev = &dsi->dev;
>> +	int ret;
>> +
>> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
>> +	if (ctx->dsi[1])
>> +		ctx->dsi[1]->mode_flags &= ~MIPI_DSI_MODE_LPM;
>> +
>> +	ret = mipi_dsi_dcs_set_display_off(dsi);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to set display off: %d\n", ret);
>> +		return ret;
>> +	}
>> +	msleep(35);
>> +
>> +	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
>> +		return ret;
>> +	}
>> +	msleep(20);
>> +
>> +	return 0;
>> +}
>> +
>> +static int rm69380_prepare(struct drm_panel *panel)
>> +{
>> +	struct rm69380_panel *ctx = to_rm69380_panel(panel);
>> +	struct device *dev = &ctx->dsi[0]->dev;
>> +	int ret;
>> +
>> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), 
>> ctx->supplies);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to enable regulators: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	rm69380_reset(ctx);
>> +
>> +	ret = rm69380_on(ctx);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to initialize panel: %d\n", ret);
>> +		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int rm69380_unprepare(struct drm_panel *panel)
>> +{
>> +	struct rm69380_panel *ctx = to_rm69380_panel(panel);
>> +	struct device *dev = &ctx->dsi[0]->dev;
>> +	int ret;
>> +
>> +	ret = rm69380_off(ctx);
>> +	if (ret < 0)
>> +		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
>> +
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct drm_display_mode rm69380_mode = {
>> +	.clock = (2560 + 32 + 12 + 38) * (1600 + 20 + 4 + 8) * 90 / 1000,
>> +	.hdisplay = 2560,
>> +	.hsync_start = 2560 + 32,
>> +	.hsync_end = 2560 + 32 + 12,
>> +	.htotal = 2560 + 32 + 12 + 38,
>> +	.vdisplay = 1600,
>> +	.vsync_start = 1600 + 20,
>> +	.vsync_end = 1600 + 20 + 4,
>> +	.vtotal = 1600 + 20 + 4 + 8,
>> +	.width_mm = 248,
>> +	.height_mm = 155,
>> +	.type = DRM_MODE_TYPE_DRIVER,
>> +};
>> +
>> +static int rm69380_get_modes(struct drm_panel *panel,
>> +					struct drm_connector *connector)
>> +{
>> +	return drm_connector_helper_get_modes_fixed(connector, 
>> &rm69380_mode);
>> +}
>> +
>> +static const struct drm_panel_funcs rm69380_panel_funcs = {
>> +	.prepare = rm69380_prepare,
>> +	.unprepare = rm69380_unprepare,
>> +	.get_modes = rm69380_get_modes,
>> +};
>> +
>> +static int rm69380_bl_update_status(struct backlight_device *bl)
>> +{
>> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
>> +	u16 brightness = backlight_get_brightness(bl);
>> +	int ret;
>> +
>> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
>> +
>> +	ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
>> +
>> +	return 0;
>> +}
>> +
>> +static int rm69380_bl_get_brightness(struct backlight_device *bl)
>> +{
>> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
>> +	u16 brightness;
>> +	int ret;
>> +
>> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
>> +
>> +	ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
>> +
>> +	return brightness;
>> +}
>> +
>> +static const struct backlight_ops rm69380_bl_ops = {
>> +	.update_status = rm69380_bl_update_status,
>> +	.get_brightness = rm69380_bl_get_brightness,
>> +};
>> +
>> +static struct backlight_device *
>> +rm69380_create_backlight(struct mipi_dsi_device *dsi)
>> +{
>> +	struct device *dev = &dsi->dev;
>> +	const struct backlight_properties props = {
>> +		.type = BACKLIGHT_RAW,
>> +		.brightness = 2047,
> 
> Might be nice to reduce the init brightness to something lower, like 
> 1023 or
> 511?  But also drop the brightness call in _on().
> 

Good call, the OLED panel on my tablet likes to burn-in (temporarily) 
really fast on high brightness. I did however notice that at least on an 
Arch Linux ARM rootfs, the brightness is being remembered and restored 
upon boot.

>> +		.max_brightness = 2047,
>> +	};
>> +
>> +	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
>> +					      &rm69380_bl_ops, &props);
>> +}
>> +
>> +static int rm69380_probe(struct mipi_dsi_device *dsi)
>> +{
>> +	struct mipi_dsi_host *dsi_sec_host;
>> +	struct rm69380_panel *ctx;
>> +	struct device *dev = &dsi->dev;
>> +	struct device_node *dsi_sec;
>> +	int ret, i;
>> +
>> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>> +	if (!ctx)
>> +		return -ENOMEM;
>> +
>> +	ctx->supplies[0].supply = "vddio";
>> +	ctx->supplies[1].supply = "avdd";
>> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
>> +				      ctx->supplies);
>> +	if (ret < 0)
>> +		return dev_err_probe(dev, ret, "Failed to get regulators\n");
>> +
>> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
>> +	if (IS_ERR(ctx->reset_gpio))
>> +		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
>> +				     "Failed to get reset-gpios\n");
>> +
>> +	dsi_sec = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
>> +
>> +	if (dsi_sec) {
>> +		const struct mipi_dsi_device_info info = { "RM69380", 0,
>> +							   dsi_sec };
>> +
>> +		dev_dbg(dev, "Using Dual-DSI: found `%s`\n", dsi_sec->name);
>> +
>> +		dsi_sec_host = of_find_mipi_dsi_host_by_node(dsi_sec);
>> +		of_node_put(dsi_sec);
>> +		if (!dsi_sec_host)
>> +			return dev_err_probe(dev, -EPROBE_DEFER,
>> +					     "Cannot get secondary DSI host\n");
>> +
>> +		ctx->dsi[1] =
>> +			devm_mipi_dsi_device_register_full(dev, dsi_sec_host, &info);
>> +		if (IS_ERR(ctx->dsi[1]))
>> +			return dev_err_probe(dev, PTR_ERR(ctx->dsi[1]),
>> +					     "Cannot get secondary DSI node\n");
>> +
>> +		dev_dbg(dev, "Second DSI name `%s`\n", ctx->dsi[1]->name);
> 
> Let's drop my debug logs :)
> 
>> +		mipi_dsi_set_drvdata(ctx->dsi[1], ctx);
>> +	} else {
>> +		dev_dbg(dev, "Using Single-DSI\n");
>> +	}
>> +
>> +	ctx->dsi[0] = dsi;
>> +	mipi_dsi_set_drvdata(dsi, ctx);
>> +
>> +	drm_panel_init(&ctx->panel, dev, &rm69380_panel_funcs,
>> +		       DRM_MODE_CONNECTOR_DSI);
>> +	ctx->panel.prepare_prev_first = true;
>> +
>> +	ctx->panel.backlight = rm69380_create_backlight(dsi);
>> +	if (IS_ERR(ctx->panel.backlight))
>> +		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
>> +				     "Failed to create backlight\n");
>> +
>> +	drm_panel_add(&ctx->panel);
>> +
>> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
>> +		if (!ctx->dsi[i])
>> +			continue;
>> +
>> +		dev_dbg(&ctx->dsi[i]->dev, "Binding DSI %d\n", i);
> 
> Probably not very useful?
> 
>> +
>> +		ctx->dsi[i]->lanes = 4;
>> +		ctx->dsi[i]->format = MIPI_DSI_FMT_RGB888;
>> +		ctx->dsi[i]->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
>> +					  MIPI_DSI_CLOCK_NON_CONTINUOUS;
>> +
>> +		ret = mipi_dsi_attach(ctx->dsi[i]);
>> +		if (ret < 0) {
>> +			mipi_dsi_detach(ctx->dsi[i]);
> 
> This isn't sound as written.  If attaching fails, it is likely an error 
> to
> detach the same DSI device.
> 
> The error scenario that Christophe pointed out is when attaching dsi[1]
> fails, in this case you have to detach dsi[0].  But as written in late 
> v2
> review, instead of making complicated logic statements there is a 
> matching
> devm_mipi_dsi_attach() to handle these cleanup scenarios for you.  This 
> should
> also remove the need for mipi_dsi_attach() in the _remove function.
> 
> - Marijn
> 
>> +			drm_panel_remove(&ctx->panel);
>> +			return dev_err_probe(dev, ret,
>> +					     "Failed to attach to DSI%d\n", i);
>> +		}
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static void rm69380_remove(struct mipi_dsi_device *dsi)
>> +{
>> +	struct rm69380_panel *ctx = mipi_dsi_get_drvdata(dsi);
>> +	int i;
>> +	int ret;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
>> +		if (!ctx->dsi[i])
>> +			continue;
>> +
>> +		ret = mipi_dsi_detach(ctx->dsi[i]);
>> +		if (ret < 0)
>> +			dev_err(&dsi->dev, "Failed to detach from DSI%d host: %d\n", i, 
>> ret);
>> +	}
>> +
>> +	drm_panel_remove(&ctx->panel);
>> +}
>> +
>> +static const struct of_device_id rm69380_of_match[] = {
>> +	{ .compatible = "lenovo,j716f-edo-rm69380" },
>> +	{ /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, rm69380_of_match);
>> +
>> +static struct mipi_dsi_driver rm69380_panel_driver = {
>> +	.probe = rm69380_probe,
>> +	.remove = rm69380_remove,
>> +	.driver = {
>> +		.name = "panel-raydium-rm69380",
>> +		.of_match_table = rm69380_of_match,
>> +	},
>> +};
>> +module_mipi_dsi_driver(rm69380_panel_driver);
>> +
>> +MODULE_AUTHOR("David Wronek <david@mainlining.org");
>> +MODULE_DESCRIPTION("DRM driver for Raydium RM69380-equipped DSI 
>> panels");
>> +MODULE_LICENSE("GPL");
>> 
>> --
>> 2.44.0
>> 

-- 
Best regards,
David Wronek <david@mainlining.org>