From a8a51b04d084a056bde6d84a988487ad10df9e4e Mon Sep 17 00:00:00 2001
From: William Wu <william.wu@rock-chips.com>
Date: Fri, 2 Jun 2017 11:20:23 +0800
Subject: [PATCH 32/86] phy: rockchip-inno-usb2: add a delay after phy resume
Git-commit: fbbe98cd44508def1c6b7f98d5dc676d23bc9031
Patch-mainline: v4.13-rc1
References: fate#323912
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>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
index 8efe78a49916..f12dc8db5230 100644
--- 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;
}
--
2.11.0