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@xxxxxxxxx>
---
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;
--
1.9.1
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