[PATCH v6 10/14] drm/mediatek: Support "None" alpha blending in OVL

[Shawn Sung <shawn.sung@mediatek.com>]

From: Hsiao Chien Sung <shawn.sung@mediatek.com>

Support "None" blend mode on MediaTek's chips.

Please refer to the description of the commit
"drm/mediatek: Support alpha blending in display driver"
for more information.

Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index b1e5d453316cc..a936f338ab79d 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -484,7 +484,8 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
 		con |= state->base.alpha & OVL_CON_ALPHA;
 	}
 
-	if (state->base.fb && !state->base.fb->format->has_alpha)
+	if (blend_mode == DRM_MODE_BLEND_PIXEL_NONE ||
+	    (state->base.fb && !state->base.fb->format->has_alpha))
 		ignore_pixel_alpha = OVL_CONST_BLEND;
 
 	if (pending->rotation & DRM_MODE_REFLECT_Y) {
-- 
2.18.0