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drm/amd/display: Use 1/8th DSC target bitrate precision for N4:2:2 and 4:2:0 formats 

[why]
On at least some of the devices (e.g. Realtek scaler) we get a black screen if 1/16th
precision is used.

[how]
Work around it by reducing precision to 1/8th for N4:2:2 and 4:2:0 color formats. This
is a safe workaround and would have a very mild impact on the quality.
The issue is still to be root-caused and fixed correctly.

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nikola Cornij 2019-03-28 13:47:25 -04:00 committed by Alex Deucher
parent db5378c1dc
commit d438d11338
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
View File

@ -228,6 +228,10 @@ static bool dc_intersect_dsc_caps(
dsc_common_caps->bpp_increment_div = min(dsc_sink_caps->bpp_increment_div, dsc_enc_caps->bpp_increment_div);
// TODO DSC: Remove this workaround for N422 and 420 once it's fixed, or move it to get_dsc_encoder_caps()
if (pixel_encoding == PIXEL_ENCODING_YCBCR422 || pixel_encoding == PIXEL_ENCODING_YCBCR420)
dsc_common_caps->bpp_increment_div = min(dsc_common_caps->bpp_increment_div, (uint32_t)8);
return true;
}