From 6ec4beb5c701f728548b587082c83ef62eb36035 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Mon, 27 Apr 2009 13:33:41 -0400 Subject: USB: new flag for resume-from-hibernation This patch (as1237) changes the way the PCI host controller drivers avoid retaining bogus hardware states during resume-from-hibernation. Previously we had reset the hardware as part of preparing to reinstate the memory image. But we can do better now with the new PM framework, since we know exactly which resume operations are from hibernation. The pci_resume method is changed to accept a flag indicating whether the system is resuming from hibernation. When this flag is set, the drivers will reset the hardware to get rid of any existing state. Similarly, the pci_suspend method is changed to remove the pm_message_t argument. It's no longer needed, since no special action has to be taken when preparing to reinstate the memory image. Signed-off-by: Alan Stern Acked-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-pci.c | 17 ++++++----------- drivers/usb/host/ohci-pci.c | 13 +++++++------ drivers/usb/host/uhci-hcd.c | 12 ++++++------ 3 files changed, 19 insertions(+), 23 deletions(-) (limited to 'drivers/usb/host') diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index 8172383e890..e74948898f7 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -268,7 +268,7 @@ done: * Also they depend on separate root hub suspend/resume. */ -static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message) +static int ehci_pci_suspend(struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); unsigned long flags; @@ -293,12 +293,6 @@ static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message) ehci_writel(ehci, 0, &ehci->regs->intr_enable); (void)ehci_readl(ehci, &ehci->regs->intr_enable); - /* make sure snapshot being resumed re-enumerates everything */ - if (message.event == PM_EVENT_PRETHAW) { - ehci_halt(ehci); - ehci_reset(ehci); - } - clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); bail: spin_unlock_irqrestore (&ehci->lock, flags); @@ -309,7 +303,7 @@ static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message) return rc; } -static int ehci_pci_resume(struct usb_hcd *hcd) +static int ehci_pci_resume(struct usb_hcd *hcd, bool hibernated) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); struct pci_dev *pdev = to_pci_dev(hcd->self.controller); @@ -322,10 +316,12 @@ static int ehci_pci_resume(struct usb_hcd *hcd) /* Mark hardware accessible again as we are out of D3 state by now */ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - /* If CF is still set, we maintained PCI Vaux power. + /* If CF is still set and we aren't resuming from hibernation + * then we maintained PCI Vaux power. * Just undo the effect of ehci_pci_suspend(). */ - if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) { + if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF && + !hibernated) { int mask = INTR_MASK; if (!hcd->self.root_hub->do_remote_wakeup) @@ -335,7 +331,6 @@ static int ehci_pci_resume(struct usb_hcd *hcd) return 0; } - ehci_dbg(ehci, "lost power, restarting\n"); usb_root_hub_lost_power(hcd->self.root_hub); /* Else reset, to cope with power loss or flush-to-storage diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c index ee0a68ca5fd..d2ba04dd785 100644 --- a/drivers/usb/host/ohci-pci.c +++ b/drivers/usb/host/ohci-pci.c @@ -372,7 +372,7 @@ static int __devinit ohci_pci_start (struct usb_hcd *hcd) #ifdef CONFIG_PM -static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message) +static int ohci_pci_suspend(struct usb_hcd *hcd) { struct ohci_hcd *ohci = hcd_to_ohci (hcd); unsigned long flags; @@ -394,10 +394,6 @@ static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message) ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable); (void)ohci_readl(ohci, &ohci->regs->intrdisable); - /* make sure snapshot being resumed re-enumerates everything */ - if (message.event == PM_EVENT_PRETHAW) - ohci_usb_reset(ohci); - clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); bail: spin_unlock_irqrestore (&ohci->lock, flags); @@ -406,9 +402,14 @@ static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message) } -static int ohci_pci_resume (struct usb_hcd *hcd) +static int ohci_pci_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; } diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c index c0133211e3e..274751b4409 100644 --- a/drivers/usb/host/uhci-hcd.c +++ b/drivers/usb/host/uhci-hcd.c @@ -769,7 +769,7 @@ static int uhci_rh_resume(struct usb_hcd *hcd) return rc; } -static int uhci_pci_suspend(struct usb_hcd *hcd, pm_message_t message) +static int uhci_pci_suspend(struct usb_hcd *hcd) { struct uhci_hcd *uhci = hcd_to_uhci(hcd); int rc = 0; @@ -795,10 +795,6 @@ static int uhci_pci_suspend(struct usb_hcd *hcd, pm_message_t message) /* FIXME: Enable non-PME# remote wakeup? */ - /* make sure snapshot being resumed re-enumerates everything */ - if (message.event == PM_EVENT_PRETHAW) - uhci_hc_died(uhci); - done_okay: clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); done: @@ -806,7 +802,7 @@ done: return rc; } -static int uhci_pci_resume(struct usb_hcd *hcd) +static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated) { struct uhci_hcd *uhci = hcd_to_uhci(hcd); @@ -820,6 +816,10 @@ static int uhci_pci_resume(struct usb_hcd *hcd) spin_lock_irq(&uhci->lock); + /* Make sure resume from hibernation re-enumerates everything */ + if (hibernated) + uhci_hc_died(uhci); + /* FIXME: Disable non-PME# remote wakeup? */ /* The firmware or a boot kernel may have changed the controller -- cgit v1.2.3-70-g09d2