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 <[email protected]>
Reviewed-by: Sean Paul <[email protected]>
---
v7->v8:
- check if the prop is created to avoid leak issue when called multiple
times.
- attempt to create prop in drm_connector_set_panel_orientation if prop
is not created before, so driver don't need to call
drm_connector_init_panel_orientation_property if they don't need to
set the property earlier.
---
drivers/gpu/drm/drm_connector.c | 62 ++++++++++++++++++++++++---------
include/drm/drm_connector.h | 2 ++
2 files changed, 48 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index a50c82bc2b2fec..572ead7ac10690 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1252,7 +1252,7 @@ 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()
*
@@ -2341,8 +2341,8 @@ 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 try to create one.
*
* 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
@@ -2373,19 +2373,12 @@ int drm_connector_set_panel_orientation(
info->panel_orientation = 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;
-
- dev->mode_config.panel_orientation_property = prop;
- }
+ if (!prop &&
+ drm_connector_init_panel_orientation_property(connector) < 0)
+ return -ENOMEM;
- 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);
@@ -2393,7 +2386,7 @@ 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
@@ -2420,6 +2413,43 @@ 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;
+
+ if(dev->mode_config.panel_orientation_property)
+ return 0;
+
+ 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);
+
static const struct drm_prop_enum_list privacy_screen_enum[] = {
{ PRIVACY_SCREEN_DISABLED, "Disabled" },
{ PRIVACY_SCREEN_ENABLED, "Enabled" },
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 64cf5f88c05b6a..d3448a71bb4d85 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1798,6 +1798,8 @@ 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);
void drm_connector_create_privacy_screen_properties(struct drm_connector *conn);
--
2.35.0.263.gb82422642f-goog
Init panel orientation property after connector is initialized. Let the
panel driver decides the orientation value later.
Signed-off-by: Hsin-Yi Wang <[email protected]>
Acked-by: Chun-Kuang Hu <[email protected]>
---
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 5d90d2eb001935..491bf5b0a2b984 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -965,6 +965,13 @@ 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;
--
2.35.0.263.gb82422642f-goog
Hsin-Yi Wang <[email protected]> writes:
> 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.
Hi,
I stumbled upon this when investigating the same WARN_ON on amdgpu.
Thanks for the patch :)
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index a50c82bc2b2fec..572ead7ac10690 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -1252,7 +1252,7 @@ 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()
> *
> @@ -2341,8 +2341,8 @@ 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 try to create one.
> *
> * 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
> @@ -2373,19 +2373,12 @@ int drm_connector_set_panel_orientation(
> info->panel_orientation = 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;
> -
> - dev->mode_config.panel_orientation_property = prop;
> - }
> + if (!prop &&
> + drm_connector_init_panel_orientation_property(connector) < 0)
> + return -ENOMEM;
>
In the case where the property has not been created beforehand, you
forgot to reinitialize prop here, after calling
drm_connector_init_panel_orientation_property(). This means
drm_object_property_set_value() will be called with a NULL second argument
and Oops the kernel.
> - drm_object_attach_property(&connector->base, prop,
> - info->panel_orientation);
> + drm_object_property_set_value(&connector->base, prop,
> + info->panel_orientation);
--
Gabriel Krisman Bertazi
Hsin-Yi Wang <[email protected]> writes:
> On Tue, Feb 15, 2022 at 9:17 AM Gabriel Krisman Bertazi
> <[email protected]> wrote:
>>
>> Hsin-Yi Wang <[email protected]> writes:
>>
>> > 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.
>>
>> Hi,
>>
>> I stumbled upon this when investigating the same WARN_ON on amdgpu.
>> Thanks for the patch :)
>>
>> > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
>> > index a50c82bc2b2fec..572ead7ac10690 100644
>> > --- a/drivers/gpu/drm/drm_connector.c
>> > +++ b/drivers/gpu/drm/drm_connector.c
>> > @@ -1252,7 +1252,7 @@ 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()
>> > *
>> > @@ -2341,8 +2341,8 @@ 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 try to create one.
>> > *
>> > * 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
>> > @@ -2373,19 +2373,12 @@ int drm_connector_set_panel_orientation(
>> > info->panel_orientation = 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;
>> > -
>> > - dev->mode_config.panel_orientation_property = prop;
>> > - }
>> > + if (!prop &&
>> > + drm_connector_init_panel_orientation_property(connector) < 0)
>> > + return -ENOMEM;
>> >
>>
>> In the case where the property has not been created beforehand, you
>> forgot to reinitialize prop here, after calling
>> drm_connector_init_panel_orientation_property(). This means
> hi Gabriel,
>
> drm_connector_init_panel_orientation_property() will create prop if
> it's null. If prop fails to be created there, it will return -ENOMEM.
Yes. But *after the property is successfully created*, the prop variable is still
NULL. And then you call the following, using prop, which is still NULL:
>> > + drm_object_property_set_value(&connector->base, prop,
>> > + info->panel_orientation);
This will do property->dev right on the first line of code, and dereference the
null prop pointer.
You must do
prop = dev->mode_config.panel_orientation_property;
again after drm_connector_init_panel_orientation_property successfully
returns, or call drm_object_property_set_value using
dev->mode_config.panel_orientation_property directly:
drm_object_property_set_value(&connector->base,
dev->mode_config.panel_orientation_property
info->panel_orientation);
--
Gabriel Krisman Bertazi
On Tue, Feb 15, 2022 at 9:17 AM Gabriel Krisman Bertazi
<[email protected]> wrote:
>
> Hsin-Yi Wang <[email protected]> writes:
>
> > 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.
>
> Hi,
>
> I stumbled upon this when investigating the same WARN_ON on amdgpu.
> Thanks for the patch :)
>
> > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> > index a50c82bc2b2fec..572ead7ac10690 100644
> > --- a/drivers/gpu/drm/drm_connector.c
> > +++ b/drivers/gpu/drm/drm_connector.c
> > @@ -1252,7 +1252,7 @@ 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()
> > *
> > @@ -2341,8 +2341,8 @@ 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 try to create one.
> > *
> > * 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
> > @@ -2373,19 +2373,12 @@ int drm_connector_set_panel_orientation(
> > info->panel_orientation = 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;
> > -
> > - dev->mode_config.panel_orientation_property = prop;
> > - }
> > + if (!prop &&
> > + drm_connector_init_panel_orientation_property(connector) < 0)
> > + return -ENOMEM;
> >
>
> In the case where the property has not been created beforehand, you
> forgot to reinitialize prop here, after calling
> drm_connector_init_panel_orientation_property(). This means
hi Gabriel,
drm_connector_init_panel_orientation_property() will create prop if
it's null. If prop fails to be created there, it will return -ENOMEM.
> drm_object_property_set_value() will be called with a NULL second argument
> and Oops the kernel.
>
>
> > - drm_object_attach_property(&connector->base, prop,
> > - info->panel_orientation);
> > + drm_object_property_set_value(&connector->base, prop,
> > + info->panel_orientation);
>
>
> --
> Gabriel Krisman Bertazi
On Tue, Feb 15, 2022 at 12:03 PM Gabriel Krisman Bertazi
<[email protected]> wrote:
>
> Hsin-Yi Wang <[email protected]> writes:
>
> > On Tue, Feb 15, 2022 at 9:17 AM Gabriel Krisman Bertazi
> > <[email protected]> wrote:
> >>
> >> Hsin-Yi Wang <[email protected]> writes:
> >>
> >> > 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.
> >>
> >> Hi,
> >>
> >> I stumbled upon this when investigating the same WARN_ON on amdgpu.
> >> Thanks for the patch :)
> >>
> >> > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> >> > index a50c82bc2b2fec..572ead7ac10690 100644
> >> > --- a/drivers/gpu/drm/drm_connector.c
> >> > +++ b/drivers/gpu/drm/drm_connector.c
> >> > @@ -1252,7 +1252,7 @@ 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()
> >> > *
> >> > @@ -2341,8 +2341,8 @@ 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 try to create one.
> >> > *
> >> > * 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
> >> > @@ -2373,19 +2373,12 @@ int drm_connector_set_panel_orientation(
> >> > info->panel_orientation = 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;
> >> > -
> >> > - dev->mode_config.panel_orientation_property = prop;
> >> > - }
> >> > + if (!prop &&
> >> > + drm_connector_init_panel_orientation_property(connector) < 0)
> >> > + return -ENOMEM;
> >> >
> >>
> >> In the case where the property has not been created beforehand, you
> >> forgot to reinitialize prop here, after calling
> >> drm_connector_init_panel_orientation_property(). This means
> > hi Gabriel,
> >
> > drm_connector_init_panel_orientation_property() will create prop if
> > it's null. If prop fails to be created there, it will return -ENOMEM.
>
> Yes. But *after the property is successfully created*, the prop variable is still
> NULL. And then you call the following, using prop, which is still NULL:
>
> >> > + drm_object_property_set_value(&connector->base, prop,
> >> > + info->panel_orientation);
>
> This will do property->dev right on the first line of code, and dereference the
> null prop pointer.
Ah, right. Sorry that I totally missed this.
I'll fix it in the next version if the idea of this patch is accepted.
There might be another preferred solution for this.
>
> You must do
>
> prop = dev->mode_config.panel_orientation_property;
>
> again after drm_connector_init_panel_orientation_property successfully
> returns, or call drm_object_property_set_value using
> dev->mode_config.panel_orientation_property directly:
>
> drm_object_property_set_value(&connector->base,
> dev->mode_config.panel_orientation_property
> info->panel_orientation);
>
> --
> Gabriel Krisman Bertazi