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USB: EHCI, OHCI: handover changes

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This patch (as887) changes the way ehci-hcd and ohci-hcd handle a loss
of VBUS power during suspend.  In order for the USB-persist facility
to work correctly, it is necessary for low- and full-speed devices
attached to a high-speed port to be handed back to the companion
controller during resume processing.

This entails three changes: adding code to ehci-hcd to perform the
handover, removing code from ohci-hcd to turn off ports during
root-hub reinit, and adding code to ohci-hcd to turn on ports during
PCI controller resume.  (Other bus glue resume methods for platforms
supporting high-speed controllers would need a similar change, if any
existed.)

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2007-05-04 11:52:40 -04:00
committed by Greg Kroah-Hartman
parent 0458d5b4c9
commit 383975d765
6 changed files with 145 additions and 28 deletions
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7
drivers/usb/host/ehci-pci.c
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@@ -312,13 +312,14 @@ static int ehci_pci_resume(struct usb_hcd *hcd)
ehci_work(ehci);
spin_unlock_irq(&ehci->lock);
/* here we "know" root ports should always stay powered */
ehci_port_power(ehci, 1);
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_handover_companion_ports(ehci);
hcd->state = HC_STATE_SUSPENDED;
return 0;
}