[PATCH v7 14/18] drm/mediatek: Support "None" blending in Mixer

[Shawn Sung]

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

Support "None" alpha blending mode on MediaTek's chips.

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

diff --git a/drivers/gpu/drm/mediatek/mtk_ethdr.c b/drivers/gpu/drm/mediatek/mtk_ethdr.c
index 4f043be21ee36..91ebeee6c8b1d 100644
--- a/drivers/gpu/drm/mediatek/mtk_ethdr.c
+++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c
@@ -180,7 +180,8 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx,
 	else
 		mix_con |= NON_PREMULTI_SOURCE;
 
-	if (state->base.fb && !state->base.fb->format->has_alpha) {
+	if (state->base.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE ||
+	    (state->base.fb && !state->base.fb->format->has_alpha)) {
 		/*
 		 * Mixer doesn't support CONST_BLD mode,
 		 * use a trick to make the output equivalent
-- 
2.18.0