diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_dp_mst.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp_mst.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index 2d816706649d..5f2217483a87 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -1577,21 +1577,31 @@ intel_dp_mst_read_decompression_port_dsc_caps(struct intel_dp *intel_dp, static bool detect_dsc_hblank_expansion_quirk(const struct intel_connector *connector) { struct drm_i915_private *i915 = to_i915(connector->base.dev); + struct drm_dp_aux *aux = connector->dp.dsc_decompression_aux; struct drm_dp_desc desc; u8 dpcd[DP_RECEIVER_CAP_SIZE]; - if (!connector->dp.dsc_decompression_aux) + if (!aux) return false; - if (drm_dp_read_desc(connector->dp.dsc_decompression_aux, - &desc, true) < 0) + /* + * A logical port's OUI (at least for affected sinks) is all 0, so + * instead of that the parent port's OUI is used for identification. + */ + if (drm_dp_mst_port_is_logical(connector->port)) { + aux = drm_dp_mst_aux_for_parent(connector->port); + if (!aux) + aux = &connector->mst_port->aux; + } + + if (drm_dp_read_dpcd_caps(aux, dpcd) < 0) return false; - if (!drm_dp_has_quirk(&desc, - DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC)) + if (drm_dp_read_desc(aux, &desc, drm_dp_is_branch(dpcd)) < 0) return false; - if (drm_dp_read_dpcd_caps(connector->dp.dsc_decompression_aux, dpcd) < 0) + if (!drm_dp_has_quirk(&desc, + DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC)) return false; if (!(dpcd[DP_RECEIVE_PORT_0_CAP_0] & DP_HBLANK_EXPANSION_CAPABLE)) |