DisplayPort branch device may define max supported bits per
component. Update display info based on this value if bpc
is defined.
v2: cleanup to match the drm_dp_helper.c patches introduced
earlier in this series
Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 76a654e..53ec844 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3932,6 +3932,14 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp)
uint8_t *dpcd = intel_dp->dpcd;
uint8_t type;
+ if (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT) {
+ int bpc = drm_dp_downstream_max_bpc(dpcd,
+ intel_dp->downstream_ports);
+
+ if (bpc > 0)
+ intel_dp->attached_connector->base.display_info.bpc = bpc;
+ }
+
if (!intel_dp_get_dpcd(intel_dp))
return connector_status_disconnected;
@@ -3968,6 +3976,7 @@ 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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