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USB: controller resume should check the root hub

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This patch (as1394) adds code to ehci-hcd, ohci-hcd, and uhci-hcd for
automatically resuming the root hub when the controller is resumed, if
the root hub has a wakeup request pending on some port.

During resume from system sleep this doesn't matter, because the root
hubs will naturally be resumed along with every other device in the
system.  However it _will_ matter for runtime PM: If the controller is
suspended and a remote wakeup request is received then the controller
will autoresume, but we need to ensure that the root hub also
autoresumes.  Otherwise the wakeup request would be ignored, the
controller would go back to sleep, and the cycle would repeat a large
number of times (I saw this happen before the patch was written).

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
2010-06-25 14:02:24 -04:00
committed by Greg Kroah-Hartman
parent 4147200d25
commit ee0b9be829
4 changed files with 15 additions and 5 deletions
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2
drivers/usb/host/uhci-hub.c
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@ -200,7 +200,7 @@ static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
case UHCI_RH_SUSPENDING:
case UHCI_RH_SUSPENDED:
/* if port change, ask to be resumed */
if (status)
if (status || uhci->resuming_ports)
usb_hcd_resume_root_hub(hcd);
break;