diff --git a/arch/arm/mach-rockchip/rk312x.c b/arch/arm/mach-rockchip/rk312x.c
index 01ff0f575e0a..f1b81764a03c 100755
--- a/arch/arm/mach-rockchip/rk312x.c
+++ b/arch/arm/mach-rockchip/rk312x.c
@@ -104,8 +104,6 @@ static void usb_uart_init(void)
 
 static void __init rk312x_dt_map_io(void)
 {
-	u32 val;
-	
 	iotable_init(rk312x_io_desc, ARRAY_SIZE(rk312x_io_desc));
 	debug_ll_io_init();
 	usb_uart_init();
@@ -118,9 +116,7 @@ static void __init rk312x_dt_map_io(void)
 	dsb();
 	writel_relaxed(1, RK312X_TIMER5_VIRT + 0x10);
 	dsb();
-	val = readl_relaxed(RK_CRU_VIRT + RK312X_CRU_MISC_CON);
-	val &= (~(1 << 15));
-	writel_relaxed(0x80000000 | val, RK_CRU_VIRT + RK312X_CRU_MISC_CON);
+	writel_relaxed(0x80000000, RK_CRU_VIRT + RK312X_CRU_MISC_CON);
 	dsb();
 
 }