drm/i915/display: Handle MST connector in intel_attached_dp

Connector->encoder might be null for MST connector. Take this into account
in intel_attached_dp.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240906070033.289015-2-jouni.hogander@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 733de5e..000ab37 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1913,7 +1913,10 @@ static inline struct intel_dp *enc_to_intel_dp(struct intel_encoder *encoder)
 
 static inline struct intel_dp *intel_attached_dp(struct intel_connector *connector)
 {
-       return enc_to_intel_dp(intel_attached_encoder(connector));
+       if (connector->mst_port)
+               return connector->mst_port;
+       else
+               return enc_to_intel_dp(intel_attached_encoder(connector));
 }
 
 static inline bool intel_encoder_is_dp(struct intel_encoder *encoder)