DisplayPort branch device may define max supported bits per component. Update display info based on this value if bpc is defined.
Signed-off-by: Mika Kahola mika.kahola@intel.com --- drivers/gpu/drm/i915/intel_dp.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 1b94347..ad3ff37 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3932,6 +3932,17 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp) { uint8_t *dpcd = intel_dp->dpcd; uint8_t type; + uint8_t cap[4]; + + if (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT) { + int bpc; + + drm_dp_downstream_port_cap(&intel_dp->aux, dpcd, cap); + bpc = drm_dp_downstream_max_bpc(dpcd, cap); + + if (bpc > 0) + intel_dp->attached_connector->base.display_info.bpc = bpc; + }
if (!intel_dp_get_dpcd(intel_dp)) return connector_status_disconnected; @@ -3969,6 +3980,7 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp) return connector_status_unknown; }
+ /* Anything else is out of spec, warn and ignore */ DRM_DEBUG_KMS("Broken DP branch device, ignoring\n"); return connector_status_disconnected;