diff --git a/drivers/phy/phy-rockchip-emmc.c b/drivers/phy/phy-rockchip-emmc.c
index 6ebcf3e41c46..48cbe691a889 100644
--- a/drivers/phy/phy-rockchip-emmc.c
+++ b/drivers/phy/phy-rockchip-emmc.c
@@ -119,10 +119,11 @@ static int rockchip_emmc_phy_power(struct rockchip_emmc_phy *rk_phy,
 				   PHYCTRL_ENDLL_MASK,
 				   PHYCTRL_ENDLL_SHIFT));
 	/*
-	 * After enable analog DLL circuits, we need extra 10.2us
-	 * for dll to be ready for work.
+	 * After enable analog DLL circuits, we need an extra 10.2us
+	 * for dll to be ready for work. But according to testing, we
+	 * find some chips need more than 25us.
 	 */
-	udelay(11);
+	udelay(30);
 	regmap_read(rk_phy->reg_base,
 		    rk_phy->reg_offset + GRF_EMMCPHY_STATUS,
 		    &dllrdy);