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

Signed-off-by: Jouni Högander <[email protected]>
---
 drivers/gpu/drm/i915/display/intel_display_types.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h 
b/drivers/gpu/drm/i915/display/intel_display_types.h
index 733de5edcfdb3..000ab373c8879 100644
--- 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)
-- 
2.34.1

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