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authorAlan Stern <stern@rowland.harvard.edu>2012-06-28 11:19:02 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-09 08:54:18 -0700
commitc5cf9212a368d88fe1e25797699b167f6daa64a5 (patch)
treecaaa246923f277de3a72e4d642f9fa914ba98a31 /drivers/usb/host/ehci-pci.c
parent336c5c310e8f0d5baba7973765339eaf5d989fe1 (diff)
EHCI: centralize controller suspend/resume
This patch (as1563) removes a lot of duplicated code by moving the EHCI controller suspend/resume routines into the core driver, where the various platform drivers can invoke them as needed. Not only does this simplify these platform drivers, this also makes it easier for other platform drivers to add suspend/resume support in the future. Note: The patch does not touch the ehci-fsl.c file, because its approach to suspend and resume is so different from all the others. It will have to be handled specially by its maintainer. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ehci-pci.c')
-rw-r--r--drivers/usb/host/ehci-pci.c74
1 files changed, 3 insertions, 71 deletions
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 123481793a4..6e767bce060 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -331,29 +331,7 @@ done:
static int ehci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
{
- struct ehci_hcd *ehci = hcd_to_ehci(hcd);
- unsigned long flags;
- int rc = 0;
-
- if (time_before(jiffies, ehci->next_statechange))
- msleep(10);
-
- /* Root hub was already suspended. Disable irq emission and
- * mark HW unaccessible. The PM and USB cores make sure that
- * the root hub is either suspended or stopped.
- */
- ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
- spin_lock_irqsave (&ehci->lock, flags);
- ehci_writel(ehci, 0, &ehci->regs->intr_enable);
- (void)ehci_readl(ehci, &ehci->regs->intr_enable);
-
- clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
- spin_unlock_irqrestore (&ehci->lock, flags);
-
- // could save FLADJ in case of Vaux power loss
- // ... we'd only use it to handle clock skew
-
- return rc;
+ return ehci_suspend(hcd, do_wakeup);
}
static bool usb_is_intel_switchable_ehci(struct pci_dev *pdev)
@@ -402,54 +380,8 @@ static int ehci_pci_resume(struct usb_hcd *hcd, bool hibernated)
if (usb_is_intel_switchable_ehci(pdev))
ehci_enable_xhci_companion();
- // maybe restore FLADJ
-
- if (time_before(jiffies, ehci->next_statechange))
- msleep(100);
-
- /* 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 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 &&
- !hibernated) {
- int mask = INTR_MASK;
-
- ehci_prepare_ports_for_controller_resume(ehci);
- if (!hcd->self.root_hub->do_remote_wakeup)
- mask &= ~STS_PCD;
- ehci_writel(ehci, mask, &ehci->regs->intr_enable);
- ehci_readl(ehci, &ehci->regs->intr_enable);
- return 0;
- }
-
- usb_root_hub_lost_power(hcd->self.root_hub);
-
- /* Else reset, to cope with power loss or flush-to-storage
- * style "resume" having let BIOS kick in during reboot.
- */
- (void) ehci_halt(ehci);
- (void) ehci_reset(ehci);
- (void) ehci_pci_reinit(ehci, pdev);
-
- /* emptying the schedule aborts any urbs */
- spin_lock_irq(&ehci->lock);
- if (ehci->reclaim)
- end_unlink_async(ehci);
- ehci_work(ehci);
- spin_unlock_irq(&ehci->lock);
-
- ehci_writel(ehci, ehci->command, &ehci->regs->command);
- ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
- ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
-
- /* here we "know" root ports should always stay powered */
- ehci_port_power(ehci, 1);
-
- ehci->rh_state = EHCI_RH_SUSPENDED;
+ if (ehci_resume(hcd, hibernated) != 0)
+ (void) ehci_pci_reinit(ehci, pdev);
return 0;
}
#endif