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drm/amd/display: Set one 4:2:0-related PPS field as recommended by DSC spec 

[why]
'second_line_offset_adj' was mistakenly left at zero, even though DSC spec
v1.2a recommends setting this field to 512 for 4:2:0.

[how]
Set 'second_line_offset_adj' to 512 for 4:2:0 and leave at zero otherwise

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Eric Bernstein <Eric.Bernstein@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nikola Cornij 2019-06-05 14:29:47 -04:00 committed by Alex Deucher
parent 90bbf6374b
commit 61011e63f8
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/amd/display/dc/dsc/drm_dsc_dc.c
View File

@ -377,6 +377,12 @@ int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg)
vdsc_cfg->rc_bits = (hrd_delay * vdsc_cfg->bits_per_pixel) / 16;
vdsc_cfg->initial_dec_delay = hrd_delay - vdsc_cfg->initial_xmit_delay;
/* As per DSC spec v1.2a recommendation: */
if (vdsc_cfg->native_420)
vdsc_cfg->second_line_offset_adj = 512;
else
vdsc_cfg->second_line_offset_adj = 0;
return 0;
}
EXPORT_SYMBOL(drm_dsc_compute_rc_parameters);