linux-kernel - [PATCH 4/5] drm/mediatek: Support "Pre-multiplied" blending in Mixer

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Message-Id: <20240620-blend-v1-4-72670072ca20@mediatek.com>
Date: Thu, 20 Jun 2024 01:27:09 +0800
From: Hsiao Chien Sung via B4 Relay <devnull+shawn.sung.mediatek.com@...nel.org>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>, 
 Daniel Vetter <daniel@...ll.ch>, Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 Hsiao Chien Sung <shawn.sung@...iatek.com>
Subject: [PATCH 4/5] drm/mediatek: Support "Pre-multiplied" blending in
 Mixer

From: Hsiao Chien Sung <shawn.sung@...iatek.com>

Support "Pre-multiplied" alpha blending mode in Mixer.
Before this patch, only the coverage mode is supported.

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 48b714994492..bc43d0d760c1 100644
--- a/drivers/gpu/drm/mediatek/mtk_ethdr.c
+++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c
@@ -177,7 +177,8 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx,
 		alpha_con |= state->base.alpha & MIXER_ALPHA;
 	}
 
-	if (state->base.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE)
+	if (state->base.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE ||
+	    state->base.pixel_blend_mode == DRM_MODE_BLEND_PREMULTI)
 		alpha_con |= PREMULTI_SOURCE;
 	else
 		alpha_con |= NON_PREMULTI_SOURCE;

-- 
Git-146)