phy: rockchip-emmc: give DLL some extra time to be ready

According to the databook, 10.2us is the max time for dll to be ready to
work. However in testing, some chips need 20us for dll to be ready. This
patch adds some extra margin for dllrdy to be ready, fixing our
-ETIMEDOUT issues.
Signed-off-by: NShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: NBrian Norris <briannorris@chromium.org>
Signed-off-by: NDouglas Anderson <dianders@chromium.org>
Acked-by: NKishon Vijay Abraham I <kishon@ti.com>
Tested-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

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);