diff options
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 40 |
2 files changed, 41 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h index cbd107493f8a..ce74125c713e 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h @@ -768,6 +768,9 @@ struct amdgpu_dm_connector { uint16_t vc_full_pbn; struct mutex handle_mst_msg_ready; + /* branch device specific data */ + uint32_t branch_ieee_oui; + /* TODO see if we can merge with ddc_bus or make a dm_connector */ struct amdgpu_i2c_adapter *i2c; 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 32281bf62f70..6a817508c826 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 @@ -330,6 +330,34 @@ static bool retrieve_downstream_port_device(struct amdgpu_dm_connector *aconnect return true; } +static bool retrieve_branch_specific_data(struct amdgpu_dm_connector *aconnector) +{ + struct drm_connector *connector = &aconnector->base; + struct drm_dp_mst_port *port = aconnector->mst_output_port; + struct drm_dp_mst_port *port_parent; + struct drm_dp_aux *immediate_upstream_aux; + struct drm_dp_desc branch_desc; + + if (!port->parent) + return false; + + port_parent = port->parent->port_parent; + + immediate_upstream_aux = port_parent ? &port_parent->aux : port->mgr->aux; + + if (drm_dp_read_desc(immediate_upstream_aux, &branch_desc, true)) + return false; + + aconnector->branch_ieee_oui = (branch_desc.ident.oui[0] << 16) + + (branch_desc.ident.oui[1] << 8) + + (branch_desc.ident.oui[2]); + + drm_dbg_dp(port->aux.drm_dev, "MST branch oui 0x%x detected at %s\n", + aconnector->branch_ieee_oui, connector->name); + + return true; +} + static int dm_dp_mst_get_modes(struct drm_connector *connector) { struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector); @@ -669,6 +697,9 @@ dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr, drm_connector_set_path_property(connector, pathprop); + if (!retrieve_branch_specific_data(aconnector)) + aconnector->branch_ieee_oui = 0; + /* * Initialize connector state before adding the connectror to drm and * framebuffer lists @@ -1774,6 +1805,9 @@ static bool dp_get_link_current_set_bw(struct drm_dp_aux *aux, uint32_t *cur_lin link_bw_set = data[DP_LINK_BW_SET - DP_LINK_BW_SET]; lane_count.raw = data[DP_LANE_COUNT_SET - DP_LINK_BW_SET]; + drm_dbg_dp(aux->drm_dev, "MST_DSC downlink setting: %d, 0x%x x %d\n", + dp_link_encoding, link_bw_set, lane_count.bits.LANE_COUNT_SET); + switch (dp_link_encoding) { case DP_8b_10b_ENCODING: link_rate = link_bw_set; @@ -1870,8 +1904,10 @@ enum dc_status dm_dp_mst_is_port_support_mode( end_link_bw = aconnector->mst_local_bw; } - if (end_link_bw > 0 && stream_kbps > end_link_bw) { - DRM_DEBUG_DRIVER("MST_DSC dsc decode at last link." + if (end_link_bw > 0 && + stream_kbps > end_link_bw && + aconnector->branch_ieee_oui != DP_BRANCH_DEVICE_ID_90CC24) { + DRM_DEBUG_DRIVER("MST_DSC dsc decode at last link. " "Mode required bw can't fit into last link\n"); return DC_FAIL_BANDWIDTH_VALIDATE; } |