From: William Wu <william.wu@rock-chips.com>
Date: Fri, 5 May 2017 09:51:41 +0000 (+0800)
Subject: phy: rockchip-inno-usb2: add a delay after phy resume
X-Git-Tag: release-20171130_firefly~4^2~639
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e759aa4172306f1e1bd89dd0275b4c014f03cfed;p=firefly-linux-kernel-4.4.55.git

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.

Change-Id: I319a28069b4b3381f22cc34567226f341e948bd4
Signed-off-by: William Wu <william.wu@rock-chips.com>
---

diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
index 6a038a8cb906..0b705b15cd96 100644
--- a/drivers/phy/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/phy-rockchip-inno-usb2.c
@@ -534,6 +534,9 @@ 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;
 }