phy: rockchip: usbdp: wait aux channel ready when dp phy power on

If dp send data by aux channel too fast after phy power on,
the aux may be not ready which will cause aux error. Adding
delay to avoid this issue.

Signed-off-by: Zhang Yubing <yubing.zhang@rock-chips.com>
Change-Id: I92075e729e637078456ae67897dfb1cbda5da1cb

drivers/phy/rockchip/phy-rockchip-usbdp.c

@@ -897,6 +897,12 @@ static int rockchip_dp_phy_power_on(struct phy *phy)
 
 unlock:
 	mutex_unlock(&udphy->mutex);
+	/*
+	 * If data send by aux channel too fast after phy power on,
+	 * the aux may be not ready which will cause aux error. Adding
+	 * delay to avoid this issue.
+	 */
+	usleep_range(10000, 11000);
 	return ret;
 }