diff options
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_mst_topology.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 8433b9c59cf2..a462229908fc 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -5994,6 +5994,7 @@ static bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port) struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) { struct drm_dp_mst_port *immediate_upstream_port; + struct drm_dp_aux *immediate_upstream_aux; struct drm_dp_mst_port *fec_port; struct drm_dp_desc desc = {}; u8 endpoint_fec; @@ -6058,21 +6059,25 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) * - Port is on primary branch device * - Not a VGA adapter (DP_DWN_STRM_PORT_TYPE_ANALOG) */ - if (drm_dp_read_desc(port->mgr->aux, &desc, true)) + if (immediate_upstream_port) + immediate_upstream_aux = &immediate_upstream_port->aux; + else + immediate_upstream_aux = port->mgr->aux; + + if (drm_dp_read_desc(immediate_upstream_aux, &desc, true)) return NULL; - if (drm_dp_has_quirk(&desc, DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) && - port->mgr->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14 && - port->parent == port->mgr->mst_primary) { + if (drm_dp_has_quirk(&desc, DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD)) { u8 dpcd_ext[DP_RECEIVER_CAP_SIZE]; - if (drm_dp_read_dpcd_caps(port->mgr->aux, dpcd_ext) < 0) + if (drm_dp_read_dpcd_caps(immediate_upstream_aux, dpcd_ext) < 0) return NULL; - if ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT) && + if (dpcd_ext[DP_DPCD_REV] >= DP_DPCD_REV_14 && + ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT) && ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_TYPE_MASK) - != DP_DWN_STRM_PORT_TYPE_ANALOG)) - return port->mgr->aux; + != DP_DWN_STRM_PORT_TYPE_ANALOG))) + return immediate_upstream_aux; } /* |