drm: rcar-du: Disable alpha blending for DU planes used with VSP

When the input to a DU channel comes from a VSP, the DU doesn't perform
any blending operation. Select XRGB8888 instead of ARGB8888 to ensure
that the corresponding registers don't get written with invalid values.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
index fe90be5..45c05d0 100644 (file)
--- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
@@ -73,7 +73,7 @@ void rcar_du_vsp_enable(struct rcar_du_crtc *crtc)
                        .src.y2 = mode->vdisplay << 16,
                        .zpos = 0,
                },
-               .format = rcar_du_format_info(DRM_FORMAT_ARGB8888),
+               .format = rcar_du_format_info(DRM_FORMAT_XRGB8888),
                .source = RCAR_DU_PLANE_VSPD1,
                .colorkey = 0,
        };