diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c index 35c944a8e74d..d24be9fb5845 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c @@ -159,7 +159,7 @@ static const struct drm_connector_funcs dm_dp_mst_connector_funcs = { }; #if defined(CONFIG_DRM_AMD_DC_DCN) -static bool needs_dsc_aux_workaround(struct dc_link *link) +bool needs_dsc_aux_workaround(struct dc_link *link) { if (link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 && (link->dpcd_caps.dpcd_rev.raw == DPCD_REV_14 || link->dpcd_caps.dpcd_rev.raw == DPCD_REV_12) && @@ -209,6 +209,25 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto return true; } + +bool retrieve_downstream_port_device(struct amdgpu_dm_connector *aconnector) +{ + union dp_downstream_port_present ds_port_present; + + if (!aconnector->dsc_aux) + return false; + + if (drm_dp_dpcd_read(aconnector->dsc_aux, DP_DOWNSTREAMPORT_PRESENT, &ds_port_present, 1) < 0) { + DRM_INFO("Failed to read downstream_port_present 0x05 from DFP of branch device\n"); + return false; + } + + aconnector->mst_downstream_port_present = ds_port_present; + DRM_INFO("Downstream port present %d, type %d\n", + ds_port_present.fields.PORT_PRESENT, ds_port_present.fields.PORT_TYPE); + + return true; +} #endif static int dm_dp_mst_get_modes(struct drm_connector *connector) @@ -289,6 +308,10 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector) if (!validate_dsc_caps_on_connector(aconnector)) memset(&aconnector->dc_sink->dsc_caps, 0, sizeof(aconnector->dc_sink->dsc_caps)); + + if (!retrieve_downstream_port_device(aconnector)) + memset(&aconnector->mst_downstream_port_present, + 0, sizeof(aconnector->mst_downstream_port_present)); #endif } } |