When a plane is missing the "alpha blend mode" property, KMS drivers will use the pre-multiplied mode.
Signed-off-by: Simon Ser contact@emersion.fr Cc: Daniel Vetter daniel@ffwll.ch Cc: Pekka Paalanen ppaalanen@gmail.com --- drivers/gpu/drm/drm_blend.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c index ec37cbfabb50..eebb32ba84d7 100644 --- a/drivers/gpu/drm/drm_blend.c +++ b/drivers/gpu/drm/drm_blend.c @@ -185,6 +185,9 @@ * plane does not expose the "alpha" property, then this is * assumed to be 1.0 * + * When a plane is missing this property, the plane uses the + * "Pre-multiplied" equation. + * * Note that all the property extensions described here apply either to the * plane or the CRTC (e.g. for the background color, which currently is not * exposed and assumed to be black).