drm/amd/display: The external monitor will show gray screen during SUT reboot

[Why]
same with CL#1711022(correcting yuv420 black color in function dcn10_blank_pixel_data,program_scaler),
yuv420 black color also needs to be correct when enabling HDMI stream at the resume procedure.

[How]
correcting the yuv420 black color according to the way how 420 is packed :2 channels carry Y component,
1 channel alternate between Cb and Cr.

Signed-off-by: yanyan kang <Yanyan.Kang@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 b33eafe..f36d1f5 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
@@ -826,6 +826,14 @@ enum dc_status dcn10_enable_stream_timing(
        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 (pipe_ctx->stream_res.tg->funcs->set_blank_color)
                pipe_ctx->stream_res.tg->funcs->set_blank_color(
                                pipe_ctx->stream_res.tg,
@@ -2254,6 +2262,14 @@ void dcn10_update_mpcc(struct dc *dc, struct pipe_ctx *pipe_ctx)
                                &blnd_cfg.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 (pipe_ctx->stream->timing.pixel_encoding == PIXEL_ENCODING_YCBCR420)
+               blnd_cfg.black_color.color_r_cr = blnd_cfg.black_color.color_g_y;
+
        if (per_pixel_alpha)
                blnd_cfg.alpha_mode = MPCC_ALPHA_BLEND_MODE_PER_PIXEL_ALPHA;
        else