linux-kernel - [PATCH 01/13] soc: mediatek: Disable 9-bit alpha in ETHDR

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Date: Sun, 16 Jun 2024 16:29:11 +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>, 
 CK Hu <ck.hu@...iatek.com>, Bibby Hsieh <bibby.hsieh@...iatek.com>, 
 Daniel Kurtz <djkurtz@...omium.org>, YT Shen <yt.shen@...iatek.com>, 
 Mao Huang <littlecvr@...omium.org>, "Nancy.Lin" <nancy.lin@...iatek.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 01/13] soc: mediatek: Disable 9-bit alpha in ETHDR

From: Hsiao Chien Sung <shawn.sung@...iatek.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@...labora.com>
Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.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 156c6ff547e8..d7d16482c947 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 f370f4ec4b88..938240714e54 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,

-- 
Git-146)