diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8216cfb57be45764be04da999c1fea1d63ad06dc..d6cdbc622dd02dba89b9e8ae624b6b5bd7e477e3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3096,9 +3096,7 @@ static void ironlake_pch_enable(struct drm_crtc *crtc)
 			temp |= TRANS_DP_PORT_SEL_D;
 			break;
 		default:
-			DRM_DEBUG_KMS("Wrong PCH DP port return. Guess port B\n");
-			temp |= TRANS_DP_PORT_SEL_B;
-			break;
+			BUG();
 		}
 
 		I915_WRITE(reg, temp);