diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core/dc_link.c')
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 16 |
1 files changed, 16 insertions, 0 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 60544788e911..c8457babfdea 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -758,6 +758,18 @@ static bool detect_dp(struct dc_link *link, dal_ddc_service_set_transaction_type(link->ddc, sink_caps->transaction_type); +#if defined(CONFIG_DRM_AMD_DC_DCN) + /* Apply work around for tunneled MST on certain USB4 docks. Always use DSC if dock + * reports DSC support. + */ + if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && + link->type == dc_connection_mst_branch && + link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 && + link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT && + !link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around) + link->wa_flags.dpia_mst_dsc_always_on = true; +#endif + #if defined(CONFIG_DRM_AMD_DC_HDCP) /* In case of fallback to SST when topology discovery below fails * HDCP caps will be querried again later by the upper layer (caller @@ -1203,6 +1215,10 @@ static bool dc_link_detect_helper(struct dc_link *link, LINK_INFO("link=%d, mst branch is now Disconnected\n", link->link_index); + /* Disable work around which keeps DSC on for tunneled MST on certain USB4 docks. */ + if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) + link->wa_flags.dpia_mst_dsc_always_on = false; + dm_helpers_dp_mst_stop_top_mgr(link->ctx, link); link->mst_stream_alloc_table.stream_count = 0; |