diff options
Diffstat (limited to 'drivers/usb/host/ehci-hub.c')
| -rw-r--r-- | drivers/usb/host/ehci-hub.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 218f9660d7ee..6a607d240949 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -530,6 +530,37 @@ ehci_hub_descriptor ( desc->wHubCharacteristics = cpu_to_le16(temp); } +#ifdef CONFIG_USB_OTG +static int ehci_start_port_reset(struct usb_hcd *hcd, unsigned port) +{ + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + u32 status; + + if (!port) + return -EINVAL; + port--; + + /* start port reset before HNP protocol time out */ + status = readl(&ehci->regs->port_status[port]); + if (!(status & PORT_CONNECT)) + return -ENODEV; + + /* khubd will finish the reset later */ + if (ehci_is_TDI(ehci)) + writel(PORT_RESET | (status & ~(PORT_CSC | PORT_PEC + | PORT_OCC)), &ehci->regs->port_status[port]); + else + writel(PORT_RESET, &ehci->regs->port_status[port]); + + return 0; +} +#else +static int ehci_start_port_reset(struct usb_hcd *hcd, unsigned port) +{ + return 0; +} +#endif /* CONFIG_USB_OTG */ + /*-------------------------------------------------------------------------*/ static int ehci_hub_control ( |