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

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Message-ID: <20240614024620.19011-13-shawn.sung@mediatek.com>
Date: Fri, 14 Jun 2024 10:46:11 +0800
From: Shawn Sung <shawn.sung@...iatek.com>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>
CC: 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>, Bibby
 Hsieh <bibby.hsieh@...iatek.com>, CK Hu <ck.hu@...iatek.com>, "Nancy . Lin"
	<nancy.lin@...iatek.com>, Sean Paul <sean@...rly.run>, Jason Chen
	<jason-ch.chen@...iatek.corp-partner.google.com>, Fei Shao
	<fshao@...omium.org>, <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 v9 12/21] drm/mediatek: Support DRM plane alpha in OVL

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

Set the plane alpha according to DRM plane property.

Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.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