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