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From: Shawn Sung <shawn.sung@mediatek.com>
To: Chun-Kuang Hu <chunkuang.hu@kernel.org>
CC: Philipp Zabel <p.zabel@pengutronix.de>, David Airlie <airlied@gmail.com>,
	Daniel Vetter <daniel@ffwll.ch>, Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, Bibby
 Hsieh <bibby.hsieh@mediatek.com>, CK Hu <ck.hu@mediatek.com>, "Nancy . Lin"
	<nancy.lin@mediatek.com>, Sean Paul <sean@poorly.run>, Jason Chen
	<jason-ch.chen@mediatek.corp-partner.google.com>, Fei Shao
	<fshao@chromium.org>, <dri-devel@lists.freedesktop.org>,
	<linux-mediatek@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>, Hsiao Chien Sung
	<shawn.sung@mediatek.com>
Subject: [PATCH v9 01/21] soc: mediatek: Disable 9-bit alpha in ETHDR
Date: Fri, 14 Jun 2024 10:46:00 +0800
Message-ID: <20240614024620.19011-2-shawn.sung@mediatek.com>
In-Reply-To: <20240614024620.19011-1-shawn.sung@mediatek.com>
References: <20240614024620.19011-1-shawn.sung@mediatek.com>
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From: Hsiao Chien Sung <shawn.sung@mediatek.com>

When 9-bit alpha is enabled, its value will be converted from 0-255 to
0-256 (255 = not defined). This is designed for special HDR related
calculation, which should be disabled by default, otherwise, alpha
blending will not work correctly.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_ethdr.c | 3 +--
 drivers/soc/mediatek/mtk-mmsys.c     | 1 +
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_ethdr.c b/drivers/gpu/drm/mediatek/mtk_ethdr.c
index ac4132210585..29673611fa75 100644
--- a/drivers/gpu/drm/mediatek/mtk_ethdr.c
+++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c
@@ -50,7 +50,6 @@
 
 #define MIXER_INX_MODE_BYPASS			0
 #define MIXER_INX_MODE_EVEN_EXTEND		1
-#define DEFAULT_9BIT_ALPHA			0x100
 #define	MIXER_ALPHA_AEN				BIT(8)
 #define	MIXER_ALPHA				0xff
 #define ETHDR_CLK_NUM				13
@@ -169,7 +168,7 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx,
 		alpha_con = MIXER_ALPHA_AEN | MIXER_ALPHA;
 
 	mtk_mmsys_mixer_in_config(priv->mmsys_dev, idx + 1, alpha_con ? false : true,
-				  DEFAULT_9BIT_ALPHA,
+				  MIXER_ALPHA,
 				  pending->x & 1 ? MIXER_INX_MODE_EVEN_EXTEND :
 				  MIXER_INX_MODE_BYPASS, align_width / 2 - 1, cmdq_pkt);
 
diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
index afb2c40c85c1..00eff18a3bce 100644
--- a/drivers/soc/mediatek/mtk-mmsys.c
+++ b/drivers/soc/mediatek/mtk-mmsys.c
@@ -236,6 +236,7 @@ void mtk_mmsys_mixer_in_config(struct device *dev, int idx, bool alpha_sel, u16
 
 	mtk_mmsys_update_bits(mmsys, MT8195_VDO1_MIXER_IN1_ALPHA + (idx - 1) * 4, ~0,
 			      alpha << 16 | alpha, cmdq_pkt);
+	mtk_mmsys_update_bits(mmsys, MT8195_VDO1_HDR_TOP_CFG, BIT(15 + idx), 0, cmdq_pkt);
 	mtk_mmsys_update_bits(mmsys, MT8195_VDO1_HDR_TOP_CFG, BIT(19 + idx),
 			      alpha_sel << (19 + idx), cmdq_pkt);
 	mtk_mmsys_update_bits(mmsys, MT8195_VDO1_MIXER_IN1_PAD + (idx - 1) * 4,
-- 
2.18.0