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drm/mediatek: Fix YCbCr422 color format issue for DP

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Setting up misc0 for Pixel Encoding Format.

According to the definition of YCbCr in spec 1.2a Table 2-96,
0x1 << 1 should be written to the register.

Use switch case to distinguish RGB, YCbCr422,
and unsupported color formats.

Fixes: f70ac097a2 ("drm/mediatek: Add MT8195 Embedded DisplayPort driver")
Signed-off-by: Liankun Yang <liankun.yang@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20241025083036.8829-2-liankun.yang@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
This commit is contained in:
Liankun Yang
2024-10-25 16:28:27 +08:00
committed by Chun-Kuang Hu
parent a10f26062a
commit ef24fbd8f1
1 changed files with 8 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/gpu/drm/mediatek/mtk_dp.c
View File

@@ -543,18 +543,16 @@ static int mtk_dp_set_color_format(struct mtk_dp *mtk_dp,
enum dp_pixelformat color_format)
{
u32 val;
/* update MISC0 */
mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3034,
color_format << DP_TEST_COLOR_FORMAT_SHIFT,
DP_TEST_COLOR_FORMAT_MASK);
u32 misc0_color;
switch (color_format) {
case DP_PIXELFORMAT_YUV422:
val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR422;
misc0_color = DP_COLOR_FORMAT_YCbCr422;
break;
case DP_PIXELFORMAT_RGB:
val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_RGB;
misc0_color = DP_COLOR_FORMAT_RGB;
break;
default:
drm_warn(mtk_dp->drm_dev, "Unsupported color format: %d\n",
@@ -562,6 +560,11 @@ static int mtk_dp_set_color_format(struct mtk_dp *mtk_dp,
return -EINVAL;
}
/* update MISC0 */
mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3034,
misc0_color,
DP_TEST_COLOR_FORMAT_MASK);
mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C,
val, PIXEL_ENCODE_FORMAT_DP_ENC0_P0_MASK);
return 0;