[PATCH v3 5/5] drm: rockchip: set alpha_en to 0 if it is not used

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alpha_en should be set to 0 if it is not used, i.e. to disable alpha
blending if it was enabled before and should be disabled now.

Fixes: 2aae8ed1f390 ("drm/rockchip: Add per-pixel alpha support for the PX30 VOP")

Signed-off-by: Alex Bee <knaerzche@xxxxxxxxx>
---

 Changes in v2:
 - capitalize "F" of "Fixes" in the commit message

 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 64469439ddf2..f5b9028a16a3 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -1022,6 +1022,7 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
 		VOP_WIN_SET(vop, win, alpha_en, 1);
 	} else {
 		VOP_WIN_SET(vop, win, src_alpha_ctl, SRC_ALPHA_EN(0));
+		VOP_WIN_SET(vop, win, alpha_en, 0);
 	}
 
 	VOP_WIN_SET(vop, win, enable, 1);
-- 
2.27.0




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