drm: Add drm_any_plane_has_format()

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@anholt.net>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181029183453.28541-1-ville.syrjala@linux.intel.com

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 1fa98bd..679455e 100644 (file)
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -636,6 +636,29 @@ static int __setplane_check(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 d643d26..5dbeabd 100644 (file)
--- 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 0a0834b..3701f56 100644 (file)
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -798,5 +798,7 @@ 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