diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 17bf9116fab1c355bdf2f4bdc5bbe5caadcb0f89..ca33ee9477f12eddcf566bb1db0868da71d4a02f 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -952,7 +952,9 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */,
 			struct skl_wrpll_params *wrpll_params)
 {
 	uint64_t afe_clock = clock * 5; /* AFE Clock is 5x Pixel clock */
-	uint64_t dco_central_freq[3] = {8400000000, 9000000000, 9600000000};
+	uint64_t dco_central_freq[3] = {8400000000ULL,
+					9000000000ULL,
+					9600000000ULL};
 	uint32_t min_dco_deviation = 400;
 	uint32_t min_dco_index = 3;
 	uint32_t P0[4] = {1, 2, 3, 7};
@@ -1025,13 +1027,13 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */,
 		 wrpll_params->central_freq = dco_central_freq[min_dco_index];
 
 		 switch (dco_central_freq[min_dco_index]) {
-		 case 9600000000:
+		 case 9600000000ULL:
 			wrpll_params->central_freq = 0;
 			break;
-		 case 9000000000:
+		 case 9000000000ULL:
 			wrpll_params->central_freq = 1;
 			break;
-		 case 8400000000:
+		 case 8400000000ULL:
 			wrpll_params->central_freq = 3;
 		 }