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| author | Wenjing Liu <wenjing.liu@amd.com> | 2021-08-13 19:49:43 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-09-14 15:57:09 -0400 |
| commit | 928adbf65bb1f813487164edde6293bf42d8f195 (patch) | |
| tree | 55df5ef9266e07170e40fa97eb8f75aaedee61d9 | |
| parent | e0d09634acbbd0e217876e51d1a4d2d2a9397bc2 (diff) | |
| download | linux-stable-928adbf65bb1f813487164edde6293bf42d8f195.tar.gz linux-stable-928adbf65bb1f813487164edde6293bf42d8f195.tar.bz2 linux-stable-928adbf65bb1f813487164edde6293bf42d8f195.zip | |
drm/amd/display: update conditions to do dfp cap ext validation
[why]
According to DP specs dfp cap ext validation is only for branch
device withou 128b/132b channel coding support and
downstream of the branch device doesn't have compression.
Therefore we are adding conditions to only do dfp cap
extension validation for branch devcie supporting 8b/10b
channel coding only and it has no DSC passthrough capability.
Acked-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: George Shen <george.shen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index f1c9ee53ac67..5d9460e0dbab 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -2606,7 +2606,9 @@ static bool dp_active_dongle_validate_timing( #if defined(CONFIG_DRM_AMD_DC_DCN) } - if (dongle_caps->dfp_cap_ext.supported) { + if (dpcd_caps->channel_coding_cap.bits.DP_128b_132b_SUPPORTED == 0 && + dpcd_caps->dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_PASSTHROUGH_SUPPORT == 0 && + dongle_caps->dfp_cap_ext.supported) { if (dongle_caps->dfp_cap_ext.max_pixel_rate_in_mps < (timing->pix_clk_100hz / 10000)) return false; |