diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index c9af34861d9e3a5bf3c090f4d5cf7afafed83dfa..b4b1f9ca05b68307be26172b17b5d0b4d85c8820 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1085,7 +1085,7 @@ static uint32_t icl_pll_to_ddi_pll_sel(struct intel_encoder *encoder,
 			return DDI_CLK_SEL_TBT_810;
 		default:
 			MISSING_CASE(clock);
-			break;
+			return DDI_CLK_SEL_NONE;
 		}
 	case DPLL_ID_ICL_MGPLL1:
 	case DPLL_ID_ICL_MGPLL2: