linux-kernel - [PATCH v9 2/5] drm/mediatek: ovl: Refine ignore_pixel

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Message-ID: <20241007070101.23263-3-jason-jh.lin@mediatek.com>
Date: Mon, 7 Oct 2024 15:00:58 +0800
From: Jason-JH.Lin <jason-jh.lin@...iatek.com>
To: Adam Thiede <me@...mthiede.com>, Yassine Oudjana
	<yassine.oudjana@...il.com>, Chun-Kuang Hu <chunkuang.hu@...nel.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
CC: Shawn Sung <shawn.sung@...iatek.com>, Alper Nebi Yasak
	<alpernebiyasak@...il.com>, <dri-devel@...ts.freedesktop.org>,
	<linux-mediatek@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, "Jason-JH . Lin"
	<jason-jh.lin@...iatek.com>, Singo Chang <singo.chang@...iatek.com>, Nancy
 Lin <nancy.lin@...iatek.com>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v9 2/5] drm/mediatek: ovl: Refine ignore_pixel_alpha comment and placement

Refine the comment for ignore_pixel_alpha flag and move it to
if (state->fb) statement to make it less conditional.

Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 8453a72f9e59..ddc826c42653 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -481,16 +481,16 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
 		 */
 		if (blend_mode || state->base.fb->format->has_alpha)
 			con |= OVL_CON_AEN;
-	}
 
-	/* CONST_BLD must be enabled for XRGB formats although the alpha channel
-	 * can be ignored, or OVL will still read the value from memory.
-	 * For RGB888 related formats, whether CONST_BLD is enabled or not won't
-	 * affect the result. Therefore we use !has_alpha as the condition.
-	 */
-	if ((state->base.fb && !state->base.fb->format->has_alpha) ||
-	    blend_mode == DRM_MODE_BLEND_PIXEL_NONE)
-		ignore_pixel_alpha = OVL_CONST_BLEND;
+		/*
+		 * Although the alpha channel can be ignored, CONST_BLD must be enabled
+		 * for XRGB format, otherwise OVL will still read the value from memory.
+		 * For RGB888 related formats, whether CONST_BLD is enabled or not won't
+		 * affect the result. Therefore we use !has_alpha as the condition.
+		 */
+		if (blend_mode == DRM_MODE_BLEND_PIXEL_NONE || !state->base.fb->format->has_alpha)
+			ignore_pixel_alpha = OVL_CONST_BLEND;
+	}
 
 	if (pending->rotation & DRM_MODE_REFLECT_Y) {
 		con |= OVL_CON_VIRT_FLIP;
-- 
2.43.0