diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index d5215e2..4918995 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1285,6 +1285,20 @@
 	default:
 		break;
 	}
+
+	switch (temp & TRANS_DDI_MODE_SELECT_MASK) {
+	case TRANS_DDI_MODE_SELECT_HDMI:
+	case TRANS_DDI_MODE_SELECT_DVI:
+	case TRANS_DDI_MODE_SELECT_FDI:
+		break;
+	case TRANS_DDI_MODE_SELECT_DP_SST:
+	case TRANS_DDI_MODE_SELECT_DP_MST:
+		pipe_config->has_dp_encoder = true;
+		intel_dp_get_m_n(intel_crtc, pipe_config);
+		break;
+	default:
+		break;
+	}
 }
 
 static void intel_ddi_destroy(struct drm_encoder *encoder)