linux-kernel - [PATCH v3 02/14] drm/mediatek: Use 8-bit alpha in ETHDR

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Message-Id: <20240620-igt-v3-2-a9d62d2e2c7e@mediatek.com>
Date: Thu, 20 Jun 2024 00:38:42 +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>, Mao Huang <littlecvr@...omium.org>, 
 "Nancy.Lin" <nancy.lin@...iatek.com>
Cc: YT Shen <yt.shen@...iatek.com>, 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 v3 02/14] drm/mediatek: Use 8-bit alpha in ETHDR

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

9-bit alpha (max=0x100) is designed for special HDR related
calculation, which should be disabled by default.
Change the alpha value from 0x100 to 0xff in 8-bit form.

Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.")
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: CK Hu <ck.hu@...iatek.com>
Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_ethdr.c | 3 +--
 1 file changed, 1 insertion(+), 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);
 

-- 
Git-146)