From: Eric Yang Eric.Yang2@amd.com
[ Upstream commit 12750d1647f118496f1da727146f255f5e44d500 ]
[Why] YCbCr420 packing format uses two chanels for luma, and 1 channel for both chroma component. Our previous implementation did not account for this and results in every other pixel having very high luma value, showing greyish color instead of black.
YCbCr444 = <Y1, Cb1, Cr1>; <Y2, Cb2, Cr2> ..... YCbCr420 = <Y1, Y2, Cb1>; <Y3, Y4, Cr1> .....
[How] Program the second channel with the black color value for luma as well.
Signed-off-by: Eric Yang Eric.Yang2@amd.com Reviewed-by: Hugo Hu Hugo.Hu@amd.com Acked-by: Leo Li sunpeng.li@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- .../drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 11 ++++++++++- .../gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 9 +++++++++ 2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c index a6bcb90e8419..4443a916a0fb 100644 --- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c @@ -1268,10 +1268,19 @@ static void program_scaler(const struct dc *dc, pipe_ctx->plane_res.scl_data.lb_params.depth, &pipe_ctx->stream->bit_depth_params);
- if (pipe_ctx->stream_res.tg->funcs->set_overscan_blank_color) + if (pipe_ctx->stream_res.tg->funcs->set_overscan_blank_color) { + /* + * The way 420 is packed, 2 channels carry Y component, 1 channel + * alternate between Cb and Cr, so both channels need the pixel + * value for Y + */ + if (pipe_ctx->stream->timing.pixel_encoding == PIXEL_ENCODING_YCBCR420) + color.color_r_cr = color.color_g_y; + pipe_ctx->stream_res.tg->funcs->set_overscan_blank_color( pipe_ctx->stream_res.tg, &color); + }
pipe_ctx->plane_res.xfm->funcs->transform_set_scaler(pipe_ctx->plane_res.xfm, &pipe_ctx->plane_res.scl_data); diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c index 32e4c653b1b4..220ba828748d 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c @@ -2165,6 +2165,15 @@ static void dcn10_blank_pixel_data( color_space = stream->output_color_space; color_space_to_black_color(dc, color_space, &black_color);
+ /* + * The way 420 is packed, 2 channels carry Y component, 1 channel + * alternate between Cb and Cr, so both channels need the pixel + * value for Y + */ + if (stream->timing.pixel_encoding == PIXEL_ENCODING_YCBCR420) + black_color.color_r_cr = black_color.color_g_y; + + if (stream_res->tg->funcs->set_blank_color) stream_res->tg->funcs->set_blank_color( stream_res->tg,