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| author |   Nikola Cornij <nikola.cornij@amd.com> | 2019-06-05 14:29:47 -0400 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2019-07-18 14:17:18 -0500 |
| commit | 61011e63f87fe5dd0ebff787cd78df4d7d66aec5 (patch) | |
| tree | f8f8e8c6a9a2056f50dc54b3b059cecf86ec7bf4 /drivers/gpu/drm/amd/display/dc/dsc | |
| parent | drm/amd/display: Set default block_size, even in unexpected cases (diff) | |
| download | linux-dev-61011e63f87fe5dd0ebff787cd78df4d7d66aec5.tar.xz linux-dev-61011e63f87fe5dd0ebff787cd78df4d7d66aec5.zip | |
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>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dsc')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dsc/drm_dsc_dc.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dsc/drm_dsc_dc.c b/drivers/gpu/drm/amd/display/dc/dsc/drm_dsc_dc.c index 67089765780b..340ef4d41ebd 100644 --- a/drivers/gpu/drm/amd/display/dc/dsc/drm_dsc_dc.c +++ b/drivers/gpu/drm/amd/display/dc/dsc/drm_dsc_dc.c @@ -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); |