diff --git a/plat/rockchip/rk3399/drivers/m0/src/dram.c b/plat/rockchip/rk3399/drivers/m0/src/dram.c
index be6495b..bd46843 100644
--- a/plat/rockchip/rk3399/drivers/m0/src/dram.c
+++ b/plat/rockchip/rk3399/drivers/m0/src/dram.c
@@ -81,6 +81,8 @@
 
 void handle_dram(void)
 {
+	mmio_setbits_32(PHY_REG(0, 927), (1 << 22));
+	mmio_setbits_32(PHY_REG(1, 927), (1 << 22));
 	idle_port();
 
 	mmio_write_32(CIC_BASE + CIC_CTRL0,
@@ -96,4 +98,6 @@
 		continue;
 
 	deidle_port();
+	mmio_clrbits_32(PHY_REG(0, 927), (1 << 22));
+	mmio_clrbits_32(PHY_REG(1, 927), (1 << 22));
 }