Re: [Intel-gfx] [PATCH 1/5] drm/panel: Add helper for reading DT rotation

2019-06-14 Thread dbasehore .
On Fri, Jun 14, 2019 at 5:43 PM dbasehore .  wrote:
>
> On Wed, Jun 12, 2019 at 2:18 PM Sam Ravnborg  wrote:
> >
> > Hi Derek.
> >
> > On Mon, Jun 10, 2019 at 09:03:46PM -0700, Derek Basehore wrote:
> > > This adds a helper function for reading the rotation (panel
> > > orientation) from the device tree.
> > >
> > > Signed-off-by: Derek Basehore 
> > > ---
> > >  drivers/gpu/drm/drm_panel.c | 41 +
> > >  include/drm/drm_panel.h |  7 +++
> > >  2 files changed, 48 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> > > index dbd5b873e8f2..3b689ce4a51a 100644
> > > --- a/drivers/gpu/drm/drm_panel.c
> > > +++ b/drivers/gpu/drm/drm_panel.c
> > > @@ -172,6 +172,47 @@ struct drm_panel *of_drm_find_panel(const struct 
> > > device_node *np)
> > >   return ERR_PTR(-EPROBE_DEFER);
> > >  }
> > >  EXPORT_SYMBOL(of_drm_find_panel);
> > > +
> > > +/**
> > > + * of_drm_get_panel_orientation - look up the rotation of the panel 
> > > using a
> > > + * device tree node
> > > + * @np: device tree node of the panel
> > > + * @orientation: orientation enum to be filled in
> > The comment says "enum" but the type used is an int.
> > Why not use enum drm_panel_orientation?
> >
>
> The binding is just an int value, but I can change it to the enum.

Oops, I see what happened here. The way I wrote it should actually use the enum

>
> > > + *
> > > + * Looks up the rotation of a panel in the device tree. The rotation in 
> > > the
> > > + * device tree is counter clockwise.
> > > + *
> > > + * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or 
> > > the
> > > + * rotation property doesn't exist. -EERROR otherwise.
> > > + */
> > Initially I read -EEROOR as a specific error code.
> > But I gues the semantic is to say that a negative error code is returned
> > if something was wrong.
> > As we do not use the "-EERROR" syntax anywhere else in drm, please
> > reword like we do in other places.
> >
> >
> > Also - it is worth to mention that the rotation returned is
> > DRM_MODE_PANEL_ORIENTATION_UNKNOWN if the property is not specified.
> > I wonder if this is correct, as no property could also been
> > interpretated as DRM_MODE_PANEL_ORIENTATION_NORMAL.
> > And in most cases the roation property is optional, so one could
> > assume that no property equals 0 degree.
> >
> >
> > Sam
> >
> > > +int of_drm_get_panel_orientation(const struct device_node *np, int 
> > > *orientation)
> > > +{
> > > + int rotation, ret;
> > > +
> > > + ret = of_property_read_u32(np, "rotation", );
> > > + if (ret == -EINVAL) {
> > > + /* Don't return an error if there's no rotation property. */
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
> > > + return 0;
> > > + }
> > > +
> > > + if (ret < 0)
> > > + return ret;
> > > +
> > > + if (rotation == 0)
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
> > > + else if (rotation == 90)
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
> > > + else if (rotation == 180)
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
> > > + else if (rotation == 270)
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
> > > + else
> > > + return -EINVAL;
> > > +
> > > + return 0;
> > > +}
> > > +EXPORT_SYMBOL(of_drm_get_panel_orientation);
> > >  #endif
> > >
> > >  MODULE_AUTHOR("Thierry Reding ");
> > > diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> > > index 8c738c0e6e9f..13631b2efbaa 100644
> > > --- a/include/drm/drm_panel.h
> > > +++ b/include/drm/drm_panel.h
> > > @@ -197,11 +197,18 @@ int drm_panel_detach(struct drm_panel *panel);
> > >
> > >  #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
> > >  struct drm_panel *of_drm_find_panel(const struct device_node *np);
> > > +int of_drm_get_panel_orientation(const struct device_node *np,
> > > +  int *orientation);
> > >  #else
> > >  static inline struct drm_panel *of_drm_find_panel(const struct 
> > > device_node *np)
> > >  {
> > >   return ERR_PTR(-ENODEV);
> > >  }
> > > +int of_drm_get_panel_orientation(const struct device_node *np,
> > > +  int *orientation)
> > > +{
> > > + return -ENODEV;
> > > +}
> > >  #endif
> > >
> > >  #endif
> > > --
> > > 2.22.0.rc2.383.gf4fbbf30c2-goog
___
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 1/5] drm/panel: Add helper for reading DT rotation

2019-06-14 Thread dbasehore .
On Wed, Jun 12, 2019 at 2:18 PM Sam Ravnborg  wrote:
>
> Hi Derek.
>
> On Mon, Jun 10, 2019 at 09:03:46PM -0700, Derek Basehore wrote:
> > This adds a helper function for reading the rotation (panel
> > orientation) from the device tree.
> >
> > Signed-off-by: Derek Basehore 
> > ---
> >  drivers/gpu/drm/drm_panel.c | 41 +
> >  include/drm/drm_panel.h |  7 +++
> >  2 files changed, 48 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> > index dbd5b873e8f2..3b689ce4a51a 100644
> > --- a/drivers/gpu/drm/drm_panel.c
> > +++ b/drivers/gpu/drm/drm_panel.c
> > @@ -172,6 +172,47 @@ struct drm_panel *of_drm_find_panel(const struct 
> > device_node *np)
> >   return ERR_PTR(-EPROBE_DEFER);
> >  }
> >  EXPORT_SYMBOL(of_drm_find_panel);
> > +
> > +/**
> > + * of_drm_get_panel_orientation - look up the rotation of the panel using a
> > + * device tree node
> > + * @np: device tree node of the panel
> > + * @orientation: orientation enum to be filled in
> The comment says "enum" but the type used is an int.
> Why not use enum drm_panel_orientation?
>

The binding is just an int value, but I can change it to the enum.

> > + *
> > + * Looks up the rotation of a panel in the device tree. The rotation in the
> > + * device tree is counter clockwise.
> > + *
> > + * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or 
> > the
> > + * rotation property doesn't exist. -EERROR otherwise.
> > + */
> Initially I read -EEROOR as a specific error code.
> But I gues the semantic is to say that a negative error code is returned
> if something was wrong.
> As we do not use the "-EERROR" syntax anywhere else in drm, please
> reword like we do in other places.
>
>
> Also - it is worth to mention that the rotation returned is
> DRM_MODE_PANEL_ORIENTATION_UNKNOWN if the property is not specified.
> I wonder if this is correct, as no property could also been
> interpretated as DRM_MODE_PANEL_ORIENTATION_NORMAL.
> And in most cases the roation property is optional, so one could
> assume that no property equals 0 degree.
>
>
> Sam
>
> > +int of_drm_get_panel_orientation(const struct device_node *np, int 
> > *orientation)
> > +{
> > + int rotation, ret;
> > +
> > + ret = of_property_read_u32(np, "rotation", );
> > + if (ret == -EINVAL) {
> > + /* Don't return an error if there's no rotation property. */
> > + *orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
> > + return 0;
> > + }
> > +
> > + if (ret < 0)
> > + return ret;
> > +
> > + if (rotation == 0)
> > + *orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
> > + else if (rotation == 90)
> > + *orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
> > + else if (rotation == 180)
> > + *orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
> > + else if (rotation == 270)
> > + *orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
> > + else
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(of_drm_get_panel_orientation);
> >  #endif
> >
> >  MODULE_AUTHOR("Thierry Reding ");
> > diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> > index 8c738c0e6e9f..13631b2efbaa 100644
> > --- a/include/drm/drm_panel.h
> > +++ b/include/drm/drm_panel.h
> > @@ -197,11 +197,18 @@ int drm_panel_detach(struct drm_panel *panel);
> >
> >  #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
> >  struct drm_panel *of_drm_find_panel(const struct device_node *np);
> > +int of_drm_get_panel_orientation(const struct device_node *np,
> > +  int *orientation);
> >  #else
> >  static inline struct drm_panel *of_drm_find_panel(const struct device_node 
> > *np)
> >  {
> >   return ERR_PTR(-ENODEV);
> >  }
> > +int of_drm_get_panel_orientation(const struct device_node *np,
> > +  int *orientation)
> > +{
> > + return -ENODEV;
> > +}
> >  #endif
> >
> >  #endif
> > --
> > 2.22.0.rc2.383.gf4fbbf30c2-goog
___
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 1/5] drm/panel: Add helper for reading DT rotation

2019-06-13 Thread dbasehore .
On Wed, Jun 12, 2019 at 2:20 PM Sam Ravnborg  wrote:
>
> Hi Derek.
>
> On Mon, Jun 10, 2019 at 09:03:46PM -0700, Derek Basehore wrote:
> > This adds a helper function for reading the rotation (panel
> > orientation) from the device tree.
> >
> > Signed-off-by: Derek Basehore 
> > ---
> >  drivers/gpu/drm/drm_panel.c | 41 +
> >  include/drm/drm_panel.h |  7 +++
> >  2 files changed, 48 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> > index dbd5b873e8f2..3b689ce4a51a 100644
> > --- a/drivers/gpu/drm/drm_panel.c
> > +++ b/drivers/gpu/drm/drm_panel.c
> > @@ -172,6 +172,47 @@ struct drm_panel *of_drm_find_panel(const struct 
> > device_node *np)
> >   return ERR_PTR(-EPROBE_DEFER);
> >  }
> >  EXPORT_SYMBOL(of_drm_find_panel);
> > +
> > +/**
> > + * of_drm_get_panel_orientation - look up the rotation of the panel using a
> > + * device tree node
> > + * @np: device tree node of the panel
> > + * @orientation: orientation enum to be filled in
> > + *
> > + * Looks up the rotation of a panel in the device tree. The rotation in the
> > + * device tree is counter clockwise.
> > + *
> > + * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or 
> > the
> > + * rotation property doesn't exist. -EERROR otherwise.
> > + */
> > +int of_drm_get_panel_orientation(const struct device_node *np, int 
> > *orientation)
> > +{
> > + int rotation, ret;
> > +
> > + ret = of_property_read_u32(np, "rotation", );
>
> I just noticed that everywhere this code talks about orientation,
> but the property that it reads are rotation.
> To my best understanding these are not the same.

This is because both were previously defined in the kernel. Rotation
was defined as a binding in the devicetree for panels (which is where
we wanted to put this property) and orientation already exists as a
DRM property.

If we want to change one, I would suggest the rotation binding since
it doesn't have any upstream users yet.

>
> Sam
___
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 1/5] drm/panel: Add helper for reading DT rotation

2019-06-12 Thread Sam Ravnborg
Hi Derek.

On Mon, Jun 10, 2019 at 09:03:46PM -0700, Derek Basehore wrote:
> This adds a helper function for reading the rotation (panel
> orientation) from the device tree.
> 
> Signed-off-by: Derek Basehore 
> ---
>  drivers/gpu/drm/drm_panel.c | 41 +
>  include/drm/drm_panel.h |  7 +++
>  2 files changed, 48 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index dbd5b873e8f2..3b689ce4a51a 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
> @@ -172,6 +172,47 @@ struct drm_panel *of_drm_find_panel(const struct 
> device_node *np)
>   return ERR_PTR(-EPROBE_DEFER);
>  }
>  EXPORT_SYMBOL(of_drm_find_panel);
> +
> +/**
> + * of_drm_get_panel_orientation - look up the rotation of the panel using a
> + * device tree node
> + * @np: device tree node of the panel
> + * @orientation: orientation enum to be filled in
> + *
> + * Looks up the rotation of a panel in the device tree. The rotation in the
> + * device tree is counter clockwise.
> + *
> + * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or the
> + * rotation property doesn't exist. -EERROR otherwise.
> + */
> +int of_drm_get_panel_orientation(const struct device_node *np, int 
> *orientation)
> +{
> + int rotation, ret;
> +
> + ret = of_property_read_u32(np, "rotation", );

I just noticed that everywhere this code talks about orientation,
but the property that it reads are rotation.
To my best understanding these are not the same.

Sam
___
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 1/5] drm/panel: Add helper for reading DT rotation

2019-06-12 Thread Sam Ravnborg
Hi Derek.

On Mon, Jun 10, 2019 at 09:03:46PM -0700, Derek Basehore wrote:
> This adds a helper function for reading the rotation (panel
> orientation) from the device tree.
> 
> Signed-off-by: Derek Basehore 
> ---
>  drivers/gpu/drm/drm_panel.c | 41 +
>  include/drm/drm_panel.h |  7 +++
>  2 files changed, 48 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index dbd5b873e8f2..3b689ce4a51a 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
> @@ -172,6 +172,47 @@ struct drm_panel *of_drm_find_panel(const struct 
> device_node *np)
>   return ERR_PTR(-EPROBE_DEFER);
>  }
>  EXPORT_SYMBOL(of_drm_find_panel);
> +
> +/**
> + * of_drm_get_panel_orientation - look up the rotation of the panel using a
> + * device tree node
> + * @np: device tree node of the panel
> + * @orientation: orientation enum to be filled in
The comment says "enum" but the type used is an int.
Why not use enum drm_panel_orientation?

> + *
> + * Looks up the rotation of a panel in the device tree. The rotation in the
> + * device tree is counter clockwise.
> + *
> + * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or the
> + * rotation property doesn't exist. -EERROR otherwise.
> + */
Initially I read -EEROOR as a specific error code.
But I gues the semantic is to say that a negative error code is returned
if something was wrong.
As we do not use the "-EERROR" syntax anywhere else in drm, please
reword like we do in other places.


Also - it is worth to mention that the rotation returned is
DRM_MODE_PANEL_ORIENTATION_UNKNOWN if the property is not specified.
I wonder if this is correct, as no property could also been
interpretated as DRM_MODE_PANEL_ORIENTATION_NORMAL.
And in most cases the roation property is optional, so one could
assume that no property equals 0 degree.


Sam

> +int of_drm_get_panel_orientation(const struct device_node *np, int 
> *orientation)
> +{
> + int rotation, ret;
> +
> + ret = of_property_read_u32(np, "rotation", );
> + if (ret == -EINVAL) {
> + /* Don't return an error if there's no rotation property. */
> + *orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
> + return 0;
> + }
> +
> + if (ret < 0)
> + return ret;
> +
> + if (rotation == 0)
> + *orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
> + else if (rotation == 90)
> + *orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
> + else if (rotation == 180)
> + *orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
> + else if (rotation == 270)
> + *orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
> + else
> + return -EINVAL;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(of_drm_get_panel_orientation);
>  #endif
>  
>  MODULE_AUTHOR("Thierry Reding ");
> diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> index 8c738c0e6e9f..13631b2efbaa 100644
> --- a/include/drm/drm_panel.h
> +++ b/include/drm/drm_panel.h
> @@ -197,11 +197,18 @@ int drm_panel_detach(struct drm_panel *panel);
>  
>  #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
>  struct drm_panel *of_drm_find_panel(const struct device_node *np);
> +int of_drm_get_panel_orientation(const struct device_node *np,
> +  int *orientation);
>  #else
>  static inline struct drm_panel *of_drm_find_panel(const struct device_node 
> *np)
>  {
>   return ERR_PTR(-ENODEV);
>  }
> +int of_drm_get_panel_orientation(const struct device_node *np,
> +  int *orientation)
> +{
> + return -ENODEV;
> +}
>  #endif
>  
>  #endif
> -- 
> 2.22.0.rc2.383.gf4fbbf30c2-goog
___
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[Intel-gfx] [PATCH 1/5] drm/panel: Add helper for reading DT rotation

2019-06-10 Thread Derek Basehore
This adds a helper function for reading the rotation (panel
orientation) from the device tree.

Signed-off-by: Derek Basehore 
---
 drivers/gpu/drm/drm_panel.c | 41 +
 include/drm/drm_panel.h |  7 +++
 2 files changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index dbd5b873e8f2..3b689ce4a51a 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -172,6 +172,47 @@ struct drm_panel *of_drm_find_panel(const struct 
device_node *np)
return ERR_PTR(-EPROBE_DEFER);
 }
 EXPORT_SYMBOL(of_drm_find_panel);
+
+/**
+ * of_drm_get_panel_orientation - look up the rotation of the panel using a
+ * device tree node
+ * @np: device tree node of the panel
+ * @orientation: orientation enum to be filled in
+ *
+ * Looks up the rotation of a panel in the device tree. The rotation in the
+ * device tree is counter clockwise.
+ *
+ * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or the
+ * rotation property doesn't exist. -EERROR otherwise.
+ */
+int of_drm_get_panel_orientation(const struct device_node *np, int 
*orientation)
+{
+   int rotation, ret;
+
+   ret = of_property_read_u32(np, "rotation", );
+   if (ret == -EINVAL) {
+   /* Don't return an error if there's no rotation property. */
+   *orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
+   return 0;
+   }
+
+   if (ret < 0)
+   return ret;
+
+   if (rotation == 0)
+   *orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
+   else if (rotation == 90)
+   *orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
+   else if (rotation == 180)
+   *orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
+   else if (rotation == 270)
+   *orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
+   else
+   return -EINVAL;
+
+   return 0;
+}
+EXPORT_SYMBOL(of_drm_get_panel_orientation);
 #endif
 
 MODULE_AUTHOR("Thierry Reding ");
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 8c738c0e6e9f..13631b2efbaa 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -197,11 +197,18 @@ int drm_panel_detach(struct drm_panel *panel);
 
 #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
 struct drm_panel *of_drm_find_panel(const struct device_node *np);
+int of_drm_get_panel_orientation(const struct device_node *np,
+int *orientation);
 #else
 static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
 {
return ERR_PTR(-ENODEV);
 }
+int of_drm_get_panel_orientation(const struct device_node *np,
+int *orientation)
+{
+   return -ENODEV;
+}
 #endif
 
 #endif
-- 
2.22.0.rc2.383.gf4fbbf30c2-goog

___
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[Intel-gfx] [PATCH 1/5] drm/panel: Add helper for reading DT rotation

2019-06-10 Thread Derek Basehore
This adds a helper function for reading the rotation (panel
orientation) from the device tree.

Signed-off-by: Derek Basehore 
---
 drivers/gpu/drm/drm_panel.c | 41 +
 include/drm/drm_panel.h |  7 +++
 2 files changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index dbd5b873e8f2..3b689ce4a51a 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -172,6 +172,47 @@ struct drm_panel *of_drm_find_panel(const struct 
device_node *np)
return ERR_PTR(-EPROBE_DEFER);
 }
 EXPORT_SYMBOL(of_drm_find_panel);
+
+/**
+ * of_drm_get_panel_orientation - look up the rotation of the panel using a
+ * device tree node
+ * @np: device tree node of the panel
+ * @orientation: orientation enum to be filled in
+ *
+ * Looks up the rotation of a panel in the device tree. The rotation in the
+ * device tree is counter clockwise.
+ *
+ * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or the
+ * rotation property doesn't exist. -EERROR otherwise.
+ */
+int of_drm_get_panel_orientation(const struct device_node *np, int 
*orientation)
+{
+   int rotation, ret;
+
+   ret = of_property_read_u32(np, "rotation", );
+   if (ret == -EINVAL) {
+   /* Don't return an error if there's no rotation property. */
+   *orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
+   return 0;
+   }
+
+   if (ret < 0)
+   return ret;
+
+   if (rotation == 0)
+   *orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
+   else if (rotation == 90)
+   *orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
+   else if (rotation == 180)
+   *orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
+   else if (rotation == 270)
+   *orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
+   else
+   return -EINVAL;
+
+   return 0;
+}
+EXPORT_SYMBOL(of_drm_get_panel_orientation);
 #endif
 
 MODULE_AUTHOR("Thierry Reding ");
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 8c738c0e6e9f..13631b2efbaa 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -197,11 +197,18 @@ int drm_panel_detach(struct drm_panel *panel);
 
 #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
 struct drm_panel *of_drm_find_panel(const struct device_node *np);
+int of_drm_get_panel_orientation(const struct device_node *np,
+int *orientation);
 #else
 static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
 {
return ERR_PTR(-ENODEV);
 }
+int of_drm_get_panel_orientation(const struct device_node *np,
+int *orientation)
+{
+   return -ENODEV;
+}
 #endif
 
 #endif
-- 
2.22.0.rc2.383.gf4fbbf30c2-goog

___
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx