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drm/amd/display: update conditions to do dfp cap ext validation

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[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>
This commit is contained in:
Wenjing Liu
2021-08-13 19:49:43 -04:00
committed by Alex Deucher
parent e0d09634ac
commit 928adbf65b
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/amd/display/dc/core/dc_link.c
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@@ -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;