drm: Describe pixel_blend_mode in drm_plane_state

Adds docs for pixel_blend_mode in drm_plane_state. Fixes the warning
found by kbuild test robot:

htmldocs: include/drm/drm_plane.h:189: warning: Function parameter or member 'pixel_blend_mode' not described in 'drm_plane_state'

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Lowry Li <lowry.li@arm.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180831150934.202332-1-sean@poorly.run

diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 35ef64a9398ba3ec0bea3bb21cfe697f3a6bf84c..16f5b66684ca4b1e55a4de9cec26243bea149768 100644 (file)
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -117,6 +117,13 @@ struct drm_plane_state {
         * details.
         */
        u16 alpha;
+
+       /**
+        * @pixel_blend_mode:
+        * The alpha blending equation selection, describing how the pixels from
+        * the current plane are composited with the background. Value can be
+        * one of DRM_MODE_BLEND_*
+        */
        uint16_t pixel_blend_mode;
 
        /**