[PATCH v9 12/21] drm/mediatek: Support DRM plane alpha in OVL

[Shawn Sung]

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

Set the plane alpha according to DRM plane property.

Signed-off-by: Hsiao Chien Sung <shawn.s...@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c 
b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 1923bbd96014..2316d4a6dca7 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -450,8 +450,10 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int 
idx,
        }
 
        con = ovl_fmt_convert(ovl, fmt);
-       if (state->base.fb && state->base.fb->format->has_alpha)
-               con |= OVL_CON_AEN | OVL_CON_ALPHA;
+       if (state->base.fb) {
+               con |= OVL_CON_AEN;
+               con |= state->base.alpha & OVL_CON_ALPHA;
+       }
 
        /* CONST_BLD must be enabled for XRGB formats although the alpha channel
         * can be ignored, or OVL will still read the value from memory.
-- 
2.18.0