Re: [Intel-gfx] [PATCH v8 1/4] drm/panel: Add helper for reading DT rotation
On Mon, Oct 07, 2019 at 03:12:00PM -0700, dbasehore . wrote:
> On Mon, Oct 7, 2019 at 9:38 AM Sean Paul wrote:
> >
> > On Wed, Sep 25, 2019 at 03:58:30PM -0700, Derek Basehore wrote:
> > > This adds a helper function for reading the rotation (panel
> > > orientation) from the device tree.
> > >
> > > Signed-off-by: Derek Basehore
> > > Reviewed-by: Sam Ravnborg
> >
> > The patch LGTM, but I don't see it used anywhere later in the patch? Is
> > there a
> > panel driver incoming?
>
> Yeah, the boe-tv101wum-nl6 panel will use it. It's not in the patch
> currently sent upstream since I don't want to step on their toes, but
> I plan on sending a patch to add it as soon as that is merged.
>
> I could hold back on this patch until that panel driver is merged too.
Yeah, I think it's probably best. I don't anticipate any changes will be
required, but it's always best to review the code end-to-end.
I haven't checked in on that review, but if it's close to landing, you can also
add a patch to this stack that is based on the in-flight patches. That way we
can
get all the review out of the way and then when the panel lands, we can apply
your add-on with the rest of the series.
Sean
> Another alternative is to throw this into the generic drm_panel code,
> but there's no obvious place to put it since DRM seems to leave
> reading the DTS up to the panel drivers themselves.
>
> >
> > Sean
> >
> > > ---
> > > drivers/gpu/drm/drm_panel.c | 43 +
> > > include/drm/drm_panel.h | 9
> > > 2 files changed, 52 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> > > index 6b0bf42039cf..0909b53b74e6 100644
> > > --- a/drivers/gpu/drm/drm_panel.c
> > > +++ b/drivers/gpu/drm/drm_panel.c
> > > @@ -264,6 +264,49 @@ 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 orientation of the panel
> > > through
> > > + * the "rotation" binding from 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 orientation
> > > of the
> > > + * panel is expressed as a property name "rotation" 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,
> > > + enum drm_panel_orientation *orientation)
> > > +{
> > > + int rotation, ret;
> > > +
> > > + ret = of_property_read_u32(np, "rotation", &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 624bd15ecfab..d16158deacdc 100644
> > > --- a/include/drm/drm_panel.h
> > > +++ b/include/drm/drm_panel.h
> > > @@ -34,6 +34,8 @@ struct drm_device;
> > > struct drm_panel;
> > > struct display_timing;
> > >
> > > +enum drm_panel_orientation;
> > > +
> > > /**
> > > * struct drm_panel_funcs - perform operations on a given panel
> > > *
> > > @@ -165,11 +167,18 @@ int drm_panel_get_modes(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,
> > > + enum drm_panel_orientation *orientation);
> > > #else
> > > static inline struct drm_panel *of_drm_find_panel(const struct
> > > device_node *np)
> > > {
> > > return ERR_PTR(-ENODEV);
> > > }
> > > +static inline int of_drm_get_panel_orientation(const struct device_node
> > > *np,
> > > + enum drm_panel_orientation *orientation)
> >
Re: [Intel-gfx] [PATCH v8 1/4] drm/panel: Add helper for reading DT rotation
On Mon, Oct 7, 2019 at 9:38 AM Sean Paul wrote:
>
> On Wed, Sep 25, 2019 at 03:58:30PM -0700, Derek Basehore wrote:
> > This adds a helper function for reading the rotation (panel
> > orientation) from the device tree.
> >
> > Signed-off-by: Derek Basehore
> > Reviewed-by: Sam Ravnborg
>
> The patch LGTM, but I don't see it used anywhere later in the patch? Is there
> a
> panel driver incoming?
Yeah, the boe-tv101wum-nl6 panel will use it. It's not in the patch
currently sent upstream since I don't want to step on their toes, but
I plan on sending a patch to add it as soon as that is merged.
I could hold back on this patch until that panel driver is merged too.
Another alternative is to throw this into the generic drm_panel code,
but there's no obvious place to put it since DRM seems to leave
reading the DTS up to the panel drivers themselves.
>
> Sean
>
> > ---
> > drivers/gpu/drm/drm_panel.c | 43 +
> > include/drm/drm_panel.h | 9
> > 2 files changed, 52 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> > index 6b0bf42039cf..0909b53b74e6 100644
> > --- a/drivers/gpu/drm/drm_panel.c
> > +++ b/drivers/gpu/drm/drm_panel.c
> > @@ -264,6 +264,49 @@ 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 orientation of the panel
> > through
> > + * the "rotation" binding from 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 orientation of
> > the
> > + * panel is expressed as a property name "rotation" 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,
> > + enum drm_panel_orientation *orientation)
> > +{
> > + int rotation, ret;
> > +
> > + ret = of_property_read_u32(np, "rotation", &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 624bd15ecfab..d16158deacdc 100644
> > --- a/include/drm/drm_panel.h
> > +++ b/include/drm/drm_panel.h
> > @@ -34,6 +34,8 @@ struct drm_device;
> > struct drm_panel;
> > struct display_timing;
> >
> > +enum drm_panel_orientation;
> > +
> > /**
> > * struct drm_panel_funcs - perform operations on a given panel
> > *
> > @@ -165,11 +167,18 @@ int drm_panel_get_modes(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,
> > + enum drm_panel_orientation *orientation);
> > #else
> > static inline struct drm_panel *of_drm_find_panel(const struct device_node
> > *np)
> > {
> > return ERR_PTR(-ENODEV);
> > }
> > +static inline int of_drm_get_panel_orientation(const struct device_node
> > *np,
> > + enum drm_panel_orientation *orientation)
> > +{
> > + return -ENODEV;
> > +}
> > #endif
> >
> > #endif
> > --
> > 2.23.0.351.gc4317032e6-goog
> >
>
> --
> Sean Paul, Software Engineer, Google / Chromium OS
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Re: [Intel-gfx] [PATCH v8 1/4] drm/panel: Add helper for reading DT rotation
On Wed, Sep 25, 2019 at 03:58:30PM -0700, Derek Basehore wrote:
> This adds a helper function for reading the rotation (panel
> orientation) from the device tree.
>
> Signed-off-by: Derek Basehore
> Reviewed-by: Sam Ravnborg
The patch LGTM, but I don't see it used anywhere later in the patch? Is there a
panel driver incoming?
Sean
> ---
> drivers/gpu/drm/drm_panel.c | 43 +
> include/drm/drm_panel.h | 9
> 2 files changed, 52 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index 6b0bf42039cf..0909b53b74e6 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
> @@ -264,6 +264,49 @@ 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 orientation of the panel
> through
> + * the "rotation" binding from 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 orientation of
> the
> + * panel is expressed as a property name "rotation" 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,
> + enum drm_panel_orientation *orientation)
> +{
> + int rotation, ret;
> +
> + ret = of_property_read_u32(np, "rotation", &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 624bd15ecfab..d16158deacdc 100644
> --- a/include/drm/drm_panel.h
> +++ b/include/drm/drm_panel.h
> @@ -34,6 +34,8 @@ struct drm_device;
> struct drm_panel;
> struct display_timing;
>
> +enum drm_panel_orientation;
> +
> /**
> * struct drm_panel_funcs - perform operations on a given panel
> *
> @@ -165,11 +167,18 @@ int drm_panel_get_modes(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,
> + enum drm_panel_orientation *orientation);
> #else
> static inline struct drm_panel *of_drm_find_panel(const struct device_node
> *np)
> {
> return ERR_PTR(-ENODEV);
> }
> +static inline int of_drm_get_panel_orientation(const struct device_node *np,
> + enum drm_panel_orientation *orientation)
> +{
> + return -ENODEV;
> +}
> #endif
>
> #endif
> --
> 2.23.0.351.gc4317032e6-goog
>
--
Sean Paul, Software Engineer, Google / Chromium OS
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[Intel-gfx] [PATCH v8 1/4] drm/panel: Add helper for reading DT rotation
This adds a helper function for reading the rotation (panel
orientation) from the device tree.
Signed-off-by: Derek Basehore
Reviewed-by: Sam Ravnborg
---
drivers/gpu/drm/drm_panel.c | 43 +
include/drm/drm_panel.h | 9
2 files changed, 52 insertions(+)
diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index 6b0bf42039cf..0909b53b74e6 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -264,6 +264,49 @@ 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 orientation of the panel through
+ * the "rotation" binding from 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 orientation of the
+ * panel is expressed as a property name "rotation" 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,
+enum drm_panel_orientation *orientation)
+{
+ int rotation, ret;
+
+ ret = of_property_read_u32(np, "rotation", &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 624bd15ecfab..d16158deacdc 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -34,6 +34,8 @@ struct drm_device;
struct drm_panel;
struct display_timing;
+enum drm_panel_orientation;
+
/**
* struct drm_panel_funcs - perform operations on a given panel
*
@@ -165,11 +167,18 @@ int drm_panel_get_modes(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,
+enum drm_panel_orientation *orientation);
#else
static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
{
return ERR_PTR(-ENODEV);
}
+static inline int of_drm_get_panel_orientation(const struct device_node *np,
+ enum drm_panel_orientation *orientation)
+{
+ return -ENODEV;
+}
#endif
#endif
--
2.23.0.351.gc4317032e6-goog
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