diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index f5eb9e7b5b18..b3eb02613bff 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -182,6 +182,9 @@ static int ehci_halt (struct ehci_hcd *ehci) { u32 temp = readl (&ehci->regs->status); + /* disable any irqs left enabled by previous code */ + writel (0, &ehci->regs->intr_enable); + if ((temp & STS_HALT) != 0) return 0; @@ -335,12 +338,17 @@ static int bios_handoff (struct ehci_hcd *ehci, int where, u32 cap) #endif +/* Reboot notifiers kick in for silicon on any bus (not just pci, etc). + * This forcibly disables dma and IRQs, helping kexec and other cases + * where the next system software may expect clean state. + */ static int ehci_reboot (struct notifier_block *self, unsigned long code, void *null) { struct ehci_hcd *ehci; ehci = container_of (self, struct ehci_hcd, reboot_notifier); + (void) ehci_halt (ehci); /* make BIOS/etc use companion controller during reboot */ writel (0, &ehci->regs->configured_flag); |