From: Nikola Cornij <nikola.cor...@amd.com>
[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.cor...@amd.com>
Reviewed-by: Wenjing Liu <wenjing....@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet la...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
index 471eb9873885..c649f62d183d 100644
--- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
+++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
@@ -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;
}
--
2.20.1
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