From: Wenjing Liu Date: Fri, 13 Aug 2021 23:49:43 +0000 (-0400) Subject: drm/amd/display: update conditions to do dfp cap ext validation X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=928adbf65bb1f813487164edde6293bf42d8f195;p=linux.git 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 Signed-off-by: Wenjing Liu Reviewed-by: George Shen Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- 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 f1c9ee53ac676..5d9460e0dbabf 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;