Re: [PATCH 2/2] drm: rcar-du: Disable alpha blending for DU planes used with VSP

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On 22/02/2023 07:06, Laurent Pinchart wrote:
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@xxxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/rcar-du/rcar_du_vsp.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
index fe90be51d64e..45c05d0ffc70 100644
--- 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,
  	};

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>

 Tomi




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