[U-Boot] [PATCH] usb: ehci: only shutdown opened controller

[Peng Fan]

If the usb controller is not running, no need to shutdown it,
otherwise `usb stop` complains about:
"EHCI failed to shut down host controller".

To i.MX7D SDB, there are two usb ports, one Host, one OTG.
If we only plug one udisk to the Host port and then `usb start`,
the OTG controller for OTG port does not run actually. Then,
if `usb stop`, the OTG controller for OTG port will also be
shutdown, but it is not running.

This patch adds a check to only shutdown the running controller.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
Cc: Marek Vasut <marex at denx.de>
Cc: Simon Glass <sjg at chromium.org>
Cc: Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
Cc: Hans de Goede <hdegoede at redhat.com>
Cc: "Stefan Brüns" <stefan.bruens at rwth-aachen.de>
Cc: Stephen Warren <swarren at nvidia.com>
---
 drivers/usb/host/ehci-hcd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index fa5d584..13aa70d 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -210,6 +210,9 @@ static int ehci_shutdown(struct ehci_ctrl *ctrl)
 		return -EINVAL;
 
 	cmd = ehci_readl(&ctrl->hcor->or_usbcmd);
+	/* If not run, directly return */
+	if (!(cmd & CMD_RUN))
+		return 0;
 	cmd &= ~(CMD_PSE | CMD_ASE);
 	ehci_writel(&ctrl->hcor->or_usbcmd, cmd);
 	ret = handshake(&ctrl->hcor->or_usbsts, STS_ASS | STS_PSS, 0,
-- 
2.6.2