From: Stu Hsieh <stu.hsieh@mediatek.com>
Date: Thu, 9 Aug 2018 10:15:42 +0800
Subject: drm/mediatek: add the comment about color format setting for OVL
Git-commit: 55b53f6f7ccf0990ad83acf4fdb0436ff79fdfb6
Patch-mainline: v4.19-rc2
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
This patch add the comment about color format setting for OVL
Signed-off-by: Stu Hsieh <stu.hsieh@mediatek.com>
Signed-off-by: CK Hu <ck.hu@mediatek.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 5 +++++
1 file changed, 5 insertions(+)
--- 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
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: