[PATCH 2/2] Turn off Alpha bit when plane format has no alpha

[Mark Yacoub]

drm/mediatek: Add OVL_CON_ALPHA only when the plane format has_alpha.

This change enables XR24 format to be displayed as an overlay on top of
the primary plane.

Suggested-by: Sean Paul <seanpaul at chromium.org>
To: CK Hu <ck.hu at mediatek.com>
To: dri-devel at lists.freedesktop.org
Cc: Daniele Castagna <dcastagna at chromium.org>
Cc: Philipp Zabel <p.zabel at pengutronix.de>
Cc: David Airlie <airlied at linux.ie>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Matthias Brugger <matthias.bgg at gmail.com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-mediatek at lists.infradead.org
Signed-off-by: Mark Yacoub <markyacoub at google.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 526b595eeff9..a7851756dddf 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -266,7 +266,7 @@ static void mtk_ovl_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
 	}
 
 	con = ovl_fmt_convert(ovl, fmt);
-	if (idx != 0)
+	if (state->base.fb->format->has_alpha)
 		con |= OVL_CON_AEN | OVL_CON_ALPHA;
 
 	if (pending->rotation & DRM_MODE_REFLECT_Y) {
-- 
2.24.0.525.g8f36a354ae-goog