[PATCH 1/4] phy: rockchip-inno-usb2: add a delay after phy resume

Frank Wang
2017-05-18T03:43:17Z

From: William Wu <william.wu@rock-chips.com>

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>
---
drivers/phy/phy-rockchip-inno-usb2.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
index 8efe78a..f12dc8d 100644
--- a/drivers/phy/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/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;
}
--
2.0.0