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ehci: Handle hub port reset properly 

This has been copied from the U-Boot ehci driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2010-06-24 10:13:31 +02:00
parent 57b56a989f
commit c8363b8f60
1 changed files with 18 additions and 0 deletions
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18
drivers/usb/usb_ehci_core.c
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@ -676,6 +676,8 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
ehci_writel(status_reg, reg);
break;
} else {
int ret;
reg |= EHCI_PS_PR;
reg &= ~EHCI_PS_PE;
ehci_writel(status_reg, reg);
@ -686,6 +688,22 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
*/
wait_ms(50);
ehci->portreset |= 1 << le16_to_cpu(req->index);
/* terminate the reset */
ehci_writel(status_reg, reg & ~EHCI_PS_PR);
/*
* A host controller must terminate the reset
* and stabilize the state of the port within
* 2 milliseconds
*/
ret = handshake(status_reg, EHCI_PS_PR, 0,
2 * 1000);
if (!ret)
ehci->portreset |=
1 << le16_to_cpu(req->index);
else
printf("port(%d) reset error\n",
le16_to_cpu(req->index) - 1);
}
break;
default: