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USB: Fix runtime wakeup on OHCI 

At least some OHCI hardware (such as the MCP89) fails to flag any change
in the host status register or the port status registers when receiving
a remote wakeup while in D3 state. This results in the controller being
resumed but no device state change being noticed, at which point the
controller is put back to sleep again. Since there doesn't seem to be any
reliable way to identify the state change, just unconditionally resume the
hub. It'll be put back to sleep in the near future anyway if there are no
active devices attached to it.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: stable <stable@vger.kernel.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthew Garrett 2011-10-06 15:35:43 -04:00 committed by Greg Kroah-Hartman
parent 48e8236114
commit a8b43c00ef
1 changed files with 1 additions and 4 deletions
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5
drivers/usb/host/ohci-hub.c
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@ -356,10 +356,7 @@ static void ohci_finish_controller_resume(struct usb_hcd *hcd)
msleep(20);
}
/* Does the root hub have a port wakeup pending? */
if (ohci_readl(ohci, &ohci->regs->intrstatus) &
(OHCI_INTR_RD | OHCI_INTR_RHSC))
usb_hcd_resume_root_hub(hcd);
usb_hcd_resume_root_hub(hcd);
}
/* Carry out polling-, autostop-, and autoresume-related state changes */