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From:   Stu Hsieh <stu.hsieh@mediatek.com>
To:     CK Hu <ck.hu@mediatek.com>, Philipp Zabel <p.zabel@pengutronix.de>
CC:     David Airlie <airlied@linux.ie>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        <dri-devel@lists.freedesktop.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <srv_heupstream@mediatek.com>,
        Stu Hsieh <stu.hsieh@mediatek.com>
Subject: [PATCH v4 07/14] drm/mediatek: add the comment about color format setting for OVL
Date:   Thu, 9 Aug 2018 10:15:42 +0800
Message-ID: <1533780949-30141-8-git-send-email-stu.hsieh@mediatek.com>
In-Reply-To: <1533780949-30141-1-git-send-email-stu.hsieh@mediatek.com>
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This patch add the comment about color format setting for OVL

Signed-off-by: Stu Hsieh <stu.hsieh@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 978782a77629..0facd823c552 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -157,6 +157,11 @@ static void mtk_ovl_layer_off(struct mtk_ddp_comp *comp, unsigned int idx)
 
 static unsigned int ovl_fmt_convert(struct mtk_disp_ovl *ovl, unsigned int fmt)
 {
+	/* The return value in switch "MEM_MODE_INPUT_FORMAT_XXX"
+	 * is defined in mediatek HW data sheet.
+	 * The alphabet order in XXX is no relation to data
+	 * arrangement in memory.
+	 */
 	switch (fmt) {
 	default:
 	case DRM_FORMAT_RGB565:
-- 
2.12.5.2.gbdf23ab