[PATCH v4 1/3] gpu: drm: separate panel orientation property creating and value setting

[PATCH v4 1/3] gpu: drm: separate panel orientation property creating and value setting

[Hsin-Yi Wang]

drm_dev_register() sets connector->registration_state to
DRM_CONNECTOR_REGISTERED and dev->registered to true. If
drm_connector_set_panel_orientation() is first called after
drm_dev_register(), it will fail several checks and results in following
warning.

Add a function to create panel orientation property and set default value
to UNKNOWN, so drivers can call this function to init the property earlier
, and let the panel set the real value later.

[    4.480976] ------------[ cut here ]------------
[    4.485603] WARNING: CPU: 5 PID: 369 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xb4/0xbc
<snip>
[    4.609772] Call trace:
[    4.612208]  __drm_mode_object_add+0xb4/0xbc
[    4.616466]  drm_mode_object_add+0x20/0x2c
[    4.620552]  drm_property_create+0xdc/0x174
[    4.624723]  drm_property_create_enum+0x34/0x98
[    4.629241]  drm_connector_set_panel_orientation+0x64/0xa0
[    4.634716]  boe_panel_get_modes+0x88/0xd8
[    4.638802]  drm_panel_get_modes+0x2c/0x48
[    4.642887]  panel_bridge_get_modes+0x1c/0x28
[    4.647233]  drm_bridge_connector_get_modes+0xa0/0xd4
[    4.652273]  drm_helper_probe_single_connector_modes+0x218/0x700
[    4.658266]  drm_mode_getconnector+0x1b4/0x45c
[    4.662699]  drm_ioctl_kernel+0xac/0x128
[    4.666611]  drm_ioctl+0x268/0x410
[    4.670002]  drm_compat_ioctl+0xdc/0xf0
[    4.673829]  __arm64_compat_sys_ioctl+0xc8/0x100
[    4.678436]  el0_svc_common+0xf4/0x1c0
[    4.682174]  do_el0_svc_compat+0x28/0x3c
[    4.686088]  el0_svc_compat+0x10/0x1c
[    4.689738]  el0_sync_compat_handler+0xa8/0xcc
[    4.694171]  el0_sync_compat+0x178/0x180
[    4.698082] ---[ end trace b4f2db9d9c88610b ]---
[    4.702721] ------------[ cut here ]------------
[    4.707329] WARNING: CPU: 5 PID: 369 at drivers/gpu/drm/drm_mode_object.c:243 drm_object_attach_property+0x48/0xb8
<snip>
[    4.833830] Call trace:
[    4.836266]  drm_object_attach_property+0x48/0xb8
[    4.840958]  drm_connector_set_panel_orientation+0x84/0xa0
[    4.846432]  boe_panel_get_modes+0x88/0xd8
[    4.850516]  drm_panel_get_modes+0x2c/0x48
[    4.854600]  panel_bridge_get_modes+0x1c/0x28
[    4.858946]  drm_bridge_connector_get_modes+0xa0/0xd4
[    4.863984]  drm_helper_probe_single_connector_modes+0x218/0x700
[    4.869978]  drm_mode_getconnector+0x1b4/0x45c
[    4.874410]  drm_ioctl_kernel+0xac/0x128
[    4.878320]  drm_ioctl+0x268/0x410
[    4.881711]  drm_compat_ioctl+0xdc/0xf0
[    4.885536]  __arm64_compat_sys_ioctl+0xc8/0x100
[    4.890142]  el0_svc_common+0xf4/0x1c0
[    4.893879]  do_el0_svc_compat+0x28/0x3c
[    4.897791]  el0_svc_compat+0x10/0x1c
[    4.901441]  el0_sync_compat_handler+0xa8/0xcc
[    4.905873]  el0_sync_compat+0x178/0x180
[    4.909783] ---[ end trace b4f2db9d9c88610c ]---

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
v4, v3:
create property in dsi driver and set value in panel.

v2:
create property in connector init
https://patchwork.kernel.org/project/linux-mediatek/patch/20210426051848.2600890-1-hsinyi@chromium.org/

v1:
set panel orientation in dsi driver
https://patchwork.kernel.org/project/linux-mediatek/patch/20210409045314.3420733-1-hsinyi@chromium.org/
---
 drivers/gpu/drm/drm_connector.c | 58 +++++++++++++++++++++++++--------
 include/drm/drm_connector.h     |  2 ++
 2 files changed, 47 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 7631f76e7f34..cda83314d7ad 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1210,7 +1210,7 @@ static const struct drm_prop_enum_list dp_colorspaces[] = {
  *	INPUT_PROP_DIRECT) will still map 1:1 to the actual LCD panel
  *	coordinates, so if userspace rotates the picture to adjust for
  *	the orientation it must also apply the same transformation to the
- *	touchscreen input coordinates. This property is initialized by calling
+ *	touchscreen input coordinates. This property value is set by calling
  *	drm_connector_set_panel_orientation() or
  *	drm_connector_set_panel_orientation_with_quirk()
  *
@@ -2173,8 +2173,8 @@ EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
  * @connector: connector for which to set the panel-orientation property.
  * @panel_orientation: drm_panel_orientation value to set
  *
- * This function sets the connector's panel_orientation and attaches
- * a "panel orientation" property to the connector.
+ * This function sets the connector's panel_orientation value. If the property
+ * doesn't exist, it will create one first.
  *
  * Calling this function on a connector where the panel_orientation has
  * already been set is a no-op (e.g. the orientation has been overridden with
@@ -2206,18 +2206,16 @@ int drm_connector_set_panel_orientation(
 
 	prop = dev->mode_config.panel_orientation_property;
 	if (!prop) {
-		prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
-				"panel orientation",
-				drm_panel_orientation_enum_list,
-				ARRAY_SIZE(drm_panel_orientation_enum_list));
-		if (!prop)
-			return -ENOMEM;
+		int ret;
 
-		dev->mode_config.panel_orientation_property = prop;
+		ret = drm_connector_init_panel_orientation_property(connector);
+		if (ret)
+			return ret;
+		prop = dev->mode_config.panel_orientation_property;
 	}
 
-	drm_object_attach_property(&connector->base, prop,
-				   info->panel_orientation);
+	drm_object_property_set_value(&connector->base, prop,
+				      info->panel_orientation);
 	return 0;
 }
 EXPORT_SYMBOL(drm_connector_set_panel_orientation);
@@ -2225,7 +2223,7 @@ EXPORT_SYMBOL(drm_connector_set_panel_orientation);
 /**
  * drm_connector_set_panel_orientation_with_quirk -
  *	set the connector's panel_orientation after checking for quirks
- * @connector: connector for which to init the panel-orientation property.
+ * @connector: connector for which to set the panel-orientation property.
  * @panel_orientation: drm_panel_orientation value to set
  * @width: width in pixels of the panel, used for panel quirk detection
  * @height: height in pixels of the panel, used for panel quirk detection
@@ -2252,6 +2250,40 @@ int drm_connector_set_panel_orientation_with_quirk(
 }
 EXPORT_SYMBOL(drm_connector_set_panel_orientation_with_quirk);
 
+/**
+ * drm_connector_init_panel_orientation_property -
+ * 	create the connector's panel orientation property
+ *
+ * This function attaches a "panel orientation" property to the connector
+ * and initializes its value to DRM_MODE_PANEL_ORIENTATION_UNKNOWN.
+ *
+ * The value of the property can be set by drm_connector_set_panel_orientation()
+ * or drm_connector_set_panel_orientation_with_quirk() later.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_connector_init_panel_orientation_property(
+	struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct drm_property *prop;
+
+	prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
+			"panel orientation",
+			drm_panel_orientation_enum_list,
+			ARRAY_SIZE(drm_panel_orientation_enum_list));
+	if (!prop)
+		return -ENOMEM;
+
+	dev->mode_config.panel_orientation_property = prop;
+	drm_object_attach_property(&connector->base, prop,
+				   DRM_MODE_PANEL_ORIENTATION_UNKNOWN);
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_connector_init_panel_orientation_property);
+
 int drm_connector_set_obj_prop(struct drm_mode_object *obj,
 				    struct drm_property *property,
 				    uint64_t value)
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 1922b278ffad..4396c1c4a5db 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1696,6 +1696,8 @@ int drm_connector_set_panel_orientation_with_quirk(
 	struct drm_connector *connector,
 	enum drm_panel_orientation panel_orientation,
 	int width, int height);
+int drm_connector_init_panel_orientation_property(
+	struct drm_connector *connector);
 int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
 					  int min, int max);
 
-- 
2.31.1.498.g6c1eba8ee3d-goog

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[PATCH v4 2/3] drm/mediatek: init panel orientation property

[Hsin-Yi Wang]

Init panel orientation property after connector is initialized. Let the
panel driver decides the orientation value later.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index ae403c67cbd9..9da1fd649131 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -964,6 +964,13 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
 		ret = PTR_ERR(dsi->connector);
 		goto err_cleanup_encoder;
 	}
+
+	ret = drm_connector_init_panel_orientation_property(dsi->connector);
+	if (ret) {
+		DRM_ERROR("Unable to init panel orientation\n");
+		goto err_cleanup_encoder;
+	}
+
 	drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
 
 	return 0;
-- 
2.31.1.498.g6c1eba8ee3d-goog

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[PATCH v4 3/3] arm64: dts: mt8183: Add panel rotation

[Hsin-Yi Wang]

krane, kakadu, and kodama boards have a default panel rotation.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
 arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
index ff56bcfa3370..793cc9501337 100644
--- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
@@ -263,6 +263,7 @@ panel: panel@0 {
 		avee-supply = <&ppvarp_lcd>;
 		pp1800-supply = <&pp1800_lcd>;
 		backlight = <&backlight_lcd0>;
+		rotation = <270>;
 		port {
 			panel_in: endpoint {
 				remote-endpoint = <&dsi_out>;
-- 
2.31.1.498.g6c1eba8ee3d-goog

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Re: [PATCH v4 1/3] gpu: drm: separate panel orientation property creating and value setting

[Sean Paul]

On Wed, Apr 28, 2021 at 12:55 AM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>


Thank you for revising the patchset, this looks much better to me!


/snip

>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 7631f76e7f34..cda83314d7ad 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c

/snip

> @@ -2173,8 +2173,8 @@ EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
>   * @connector: connector for which to set the panel-orientation property.
>   * @panel_orientation: drm_panel_orientation value to set
>   *
> - * This function sets the connector's panel_orientation and attaches
> - * a "panel orientation" property to the connector.
> + * This function sets the connector's panel_orientation value. If the property
> + * doesn't exist, it will create one first.

I still don't think this function should overload initialization and
assignment. I'd prefer we just removed the creation from
set_panel_orientation entirely so this WARN can't be hit.


>   *
>   * Calling this function on a connector where the panel_orientation has
>   * already been set is a no-op (e.g. the orientation has been overridden with
> @@ -2206,18 +2206,16 @@ int drm_connector_set_panel_orientation(
>
>         prop = dev->mode_config.panel_orientation_property;
>         if (!prop) {
> -               prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
> -                               "panel orientation",
> -                               drm_panel_orientation_enum_list,
> -                               ARRAY_SIZE(drm_panel_orientation_enum_list));
> -               if (!prop)
> -                       return -ENOMEM;
> +               int ret;
>
> -               dev->mode_config.panel_orientation_property = prop;
> +               ret = drm_connector_init_panel_orientation_property(connector);
> +               if (ret)
> +                       return ret;
> +               prop = dev->mode_config.panel_orientation_property;
>         }
>
> -       drm_object_attach_property(&connector->base, prop,
> -                                  info->panel_orientation);
> +       drm_object_property_set_value(&connector->base, prop,
> +                                     info->panel_orientation);
>         return 0;
>  }
>  EXPORT_SYMBOL(drm_connector_set_panel_orientation);
> @@ -2225,7 +2223,7 @@ EXPORT_SYMBOL(drm_connector_set_panel_orientation);
>  /**
>   * drm_connector_set_panel_orientation_with_quirk -
>   *     set the connector's panel_orientation after checking for quirks
> - * @connector: connector for which to init the panel-orientation property.
> + * @connector: connector for which to set the panel-orientation property.
>   * @panel_orientation: drm_panel_orientation value to set
>   * @width: width in pixels of the panel, used for panel quirk detection
>   * @height: height in pixels of the panel, used for panel quirk detection
> @@ -2252,6 +2250,40 @@ int drm_connector_set_panel_orientation_with_quirk(
>  }
>  EXPORT_SYMBOL(drm_connector_set_panel_orientation_with_quirk);
>
> +/**
> + * drm_connector_init_panel_orientation_property -
> + *     create the connector's panel orientation property
> + *
> + * This function attaches a "panel orientation" property to the connector
> + * and initializes its value to DRM_MODE_PANEL_ORIENTATION_UNKNOWN.
> + *
> + * The value of the property can be set by drm_connector_set_panel_orientation()
> + * or drm_connector_set_panel_orientation_with_quirk() later.
> + *
> + * Returns:
> + * Zero on success, negative errno on failure.
> + */
> +int drm_connector_init_panel_orientation_property(
> +       struct drm_connector *connector)
> +{
> +       struct drm_device *dev = connector->dev;
> +       struct drm_property *prop;
> +
> +       prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
> +                       "panel orientation",
> +                       drm_panel_orientation_enum_list,
> +                       ARRAY_SIZE(drm_panel_orientation_enum_list));
> +       if (!prop)
> +               return -ENOMEM;
> +
> +       dev->mode_config.panel_orientation_property = prop;
> +       drm_object_attach_property(&connector->base, prop,
> +                                  DRM_MODE_PANEL_ORIENTATION_UNKNOWN);
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(drm_connector_init_panel_orientation_property);
> +
>  int drm_connector_set_obj_prop(struct drm_mode_object *obj,
>                                     struct drm_property *property,
>                                     uint64_t value)
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 1922b278ffad..4396c1c4a5db 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1696,6 +1696,8 @@ int drm_connector_set_panel_orientation_with_quirk(
>         struct drm_connector *connector,
>         enum drm_panel_orientation panel_orientation,
>         int width, int height);
> +int drm_connector_init_panel_orientation_property(
> +       struct drm_connector *connector);
>  int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
>                                           int min, int max);
>
> --
> 2.31.1.498.g6c1eba8ee3d-goog
>
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