linux-kernel - [PATCH v6 11/14] drm/mediatek: Support "None" alpha blending in Mixer

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Date: Fri, 22 Mar 2024 13:28:26 +0800
From: Shawn Sung <shawn.sung@...iatek.com>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>
CC: Philipp Zabel <p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>, Matthias Brugger <matthias.bgg@...il.com>,
	Bibby Hsieh <bibby.hsieh@...iatek.com>, CK Hu <ck.hu@...iatek.com>, "Nancy .
 Lin" <nancy.lin@...iatek.com>, Fei Shao <fshao@...omium.org>, Sean Paul
	<sean@...rly.run>, Jason Chen
	<jason-ch.chen@...iatek.corp-partner.google.com>,
	<dri-devel@...ts.freedesktop.org>, <linux-mediatek@...ts.infradead.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, Hsiao
 Chien Sung <shawn.sung@...iatek.com>
Subject: [PATCH v6 11/14] drm/mediatek: Support "None" alpha blending in Mixer

From: Hsiao Chien Sung <shawn.sung@...iatek.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@...iatek.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 4b12ca285e84b..951e3e82a6a1a 100644
--- a/drivers/gpu/drm/mediatek/mtk_ethdr.c
+++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c
@@ -178,7 +178,8 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx,
 	if (state->base.pixel_blend_mode != DRM_MODE_BLEND_COVERAGE)
 		mix_con |= 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