[v2,1/4] phy: rockchip-inno-usb2: add a delay after phy resume

Commit Message

Frank Wang June 2, 2017, 3:20 a.m. UTC

From: William Wu <[e-mail]>

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 <[e-mail]>
Signed-off-by: Frank Wang <[e-mail]>
---
 drivers/phy/phy-rockchip-inno-usb2.c | 3 +++
 1 file changed, 3 insertions(+)

Patch

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;
 }