drm/amd/display: fix YCbCr420 blank color

[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>

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 6349ba7..4bf2475 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1267,10 +1267,19 @@ 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 0bd33a7..e917bdc 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -2159,6 +2159,15 @@ 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,