From: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
Support "None" alpha blending mode on MediaTek's chips.
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_ethdr.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_ethdr.c b/drivers/gpu/drm/mediatek/mtk_ethdr.c
index 9dfd13d32dfa..80ccdad3741b 100644
--- a/drivers/gpu/drm/mediatek/mtk_ethdr.c
+++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c
@@ -3,6 +3,7 @@
* Copyright (c) 2021 MediaTek Inc.
*/
+#include <drm/drm_blend.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <linux/clk.h>
@@ -175,7 +176,8 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx,
alpha_con |= state->base.alpha & MIXER_ALPHA;
}
- if (state->base.fb && !state->base.fb->format->has_alpha) {
+ if ((state->base.fb && !state->base.fb->format->has_alpha) ||
+ state->base.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE) {
/*
* Mixer doesn't support CONST_BLD mode,
* use a trick to make the output equivalent
--
2.43.0
