R-Car DU driver implicitly supports DRM_MODE_BLEND_COVERAGE only. This adds a support for DRM_MODE_BLEND_PREMULTI. As a consequence, DRM_MODE_BLEND_PREMULTI becomes the default. If DRM_MODE_BLEND_COVERAGE is desired, it should be set explicitly.
This behavior comes from how DRM blend mode is supported. drm_plane_create_blend_mode_property() creates the blend mode property with the default value of DRM_MODE_BLEND_PREMULTI. This default value cannot be modified from the atomic driver. Signed-off-by: Takanari Hayama <[email protected]> --- drivers/gpu/drm/rcar-du/rcar_du_vsp.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c index 8eb9b2b097ae..b9580fcfec7a 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c @@ -167,6 +167,8 @@ static void rcar_du_vsp_plane_setup(struct rcar_du_vsp_plane *plane) cfg.mem[i] = sg_dma_address(state->sg_tables[i].sgl) + fb->offsets[i]; + cfg.premult = (state->state.pixel_blend_mode == DRM_MODE_BLEND_PREMULTI); + format = rcar_du_format_info(state->format->fourcc); cfg.pixelformat = format->v4l2; @@ -444,6 +446,10 @@ int rcar_du_vsp_init(struct rcar_du_vsp *vsp, struct device_node *np, num_planes - 1); } + drm_plane_create_blend_mode_property(&plane->plane, + BIT(DRM_MODE_BLEND_PREMULTI) | + BIT(DRM_MODE_BLEND_COVERAGE)); + vsp->num_planes++; } -- 2.25.1
