phy: rockchip-inno-usb2: add a delay after phy resume

When resume phy, it need about 1.5 ~ 2ms to wait for
utmi_clk which used for USB controller to become stable.

Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
index 8efe78a..f12dc8d 100644 (file)
--- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
@@ -463,6 +463,9 @@ static int rockchip_usb2phy_power_on(struct phy *phy)
        if (ret)
                return ret;
 
+       /* waiting for the utmi_clk to become stable */
+       usleep_range(1500, 2000);
+
        rport->suspended = false;
        return 0;
 }