diff --git a/arch/arm/mach-rockchip/ddr_freq.c b/arch/arm/mach-rockchip/ddr_freq.c
index 7bda5775a8dd..1403ed50e651 100644
--- a/arch/arm/mach-rockchip/ddr_freq.c
+++ b/arch/arm/mach-rockchip/ddr_freq.c
@@ -198,7 +198,8 @@ static void ddrfreq_mode(bool auto_self_refresh, unsigned long target_rate, char
 
 unsigned long req_freq_by_vop(unsigned long bandwidth)
 {
-	if (time_after(jiffies, vop_bandwidth_update_jiffies+down_rate_delay_ms))
+	if (time_after(jiffies, vop_bandwidth_update_jiffies +
+		msecs_to_jiffies(down_rate_delay_ms)))
 		return 0;
 
 	if (bandwidth >= 5000){
@@ -272,6 +273,8 @@ static void ddr_auto_freq(void)
 
 	vop_req_freq = req_freq_by_vop(vop_bandwidth);
 	new_freq = max(vop_req_freq, new_freq);
+	if (new_freq == 0)
+		return;
 
 	new_freq = auto_freq_round(new_freq);