diff options
Diffstat (limited to 'drivers/usb/host/ohci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ohci-hcd.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c index 4c4d652a4468..1382689b31db 100644 --- a/drivers/usb/host/ohci-hcd.c +++ b/drivers/usb/host/ohci-hcd.c @@ -1011,6 +1011,49 @@ static int ohci_restart (struct ohci_hcd *ohci) #endif +#ifdef CONFIG_PM + +static int __maybe_unused ohci_suspend(struct usb_hcd *hcd, bool do_wakeup) +{ + struct ohci_hcd *ohci = hcd_to_ohci (hcd); + unsigned long flags; + int rc = 0; + + /* Root hub was already suspended. Disable irq emission and + * mark HW unaccessible, bail out if RH has been resumed. Use + * the spinlock to properly synchronize with possible pending + * RH suspend or resume activity. + */ + spin_lock_irqsave (&ohci->lock, flags); + if (ohci->rh_state != OHCI_RH_SUSPENDED) { + rc = -EINVAL; + goto bail; + } + ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable); + (void)ohci_readl(ohci, &ohci->regs->intrdisable); + + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + bail: + spin_unlock_irqrestore (&ohci->lock, flags); + + return rc; +} + + +static int __maybe_unused ohci_resume(struct usb_hcd *hcd, bool hibernated) +{ + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + + /* Make sure resume from hibernation re-enumerates everything */ + if (hibernated) + ohci_usb_reset(hcd_to_ohci(hcd)); + + ohci_finish_controller_resume(hcd); + return 0; +} + +#endif + /*-------------------------------------------------------------------------*/ MODULE_AUTHOR (DRIVER_AUTHOR); |