From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Add a function to check whether there is at least one plane that
supports a specific format and modifier combination. Drivers can
use this to reject unsupported formats/modifiers in .fb_create().
v2: Accept anyformat if the driver doesn't do planes (Eric)
s/planes_have_format/any_plane_has_format/ (Eric)
Check the modifier as well since we already have a function
that does both
v3: Don't do the check in the core since we may not know the
modifier yet, instead export the function and let drivers
call it themselves
Cc: Eric Anholt <eric@xxxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_plane.c | 23 +++++++++++++++++++++++
include/drm/drm_mode_config.h | 6 ++++++
include/drm/drm_plane.h | 2 ++
3 files changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index a5d1fc7e8a37..3b2d6f8d889d 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -578,6 +578,29 @@ int drm_plane_check_pixel_format(struct drm_plane *plane,
return 0;
}
+/**
+ * drm_any_plane_has_format - Check whether any plane supports this format and modifier combination
+ * @dev: DRM device
+ * @format: pixel format (DRM_FORMAT_*)
+ * @modifier: data layout modifier
+ *
+ * Returns:
+ * Whether at least one plane supports the specified format and modifier combination.
+ */
+bool drm_any_plane_has_format(struct drm_device *dev,
+ u32 format, u64 modifier)
+{
+ struct drm_plane *plane;
+
+ drm_for_each_plane(plane, dev) {
+ if (drm_plane_check_pixel_format(plane, format, modifier) == 0)
+ return true;
+ }
+
+ return false;
+}
+EXPORT_SYMBOL(drm_any_plane_has_format);
+
/*
* __setplane_internal - setplane handler for internal callers
*
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 7569f22ffef6..9b894de9a75d 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -52,6 +52,12 @@ struct drm_mode_config_funcs {
* requested metadata, but most of that is left to the driver. See
* &struct drm_mode_fb_cmd2 for details.
*
+ * To validate the pixel format and modifier drivers can use
+ * drm_any_plane_has_format() to make sure at least one plane supports
+ * the requested values. Note that the driver must first determine the
+ * actual modifier used if the request doesn't have it specified,
+ * ie. when (@mode_cmd->flags & DRM_MODE_FB_MODIFIERS) == 0.
+ *
* If the parameters are deemed valid and the backing storage objects in
* the underlying memory manager all exist, then the driver allocates
* a new &drm_framebuffer structure, subclassed to contain
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index f7bf4a48b1c3..930e8fdd90f8 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -683,5 +683,7 @@ static inline struct drm_plane *drm_plane_find(struct drm_device *dev,
#define drm_for_each_plane(plane, dev) \
list_for_each_entry(plane, &(dev)->mode_config.plane_list, head)
+bool drm_any_plane_has_format(struct drm_device *dev,
+ u32 format, u64 modifier);
#endif
--
2.16.1
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