summaryrefslogtreecommitdiff
path: root/drivers/usb/host/ohci-hub.c
diff options
context:
space:
mode:
authorAlan Stern <stern@rowland.harvard.edu>2010-06-25 14:02:24 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-10 14:35:37 -0700
commitee0b9be829803e3ff5adec7456bd59a08425ffa1 (patch)
treebab8946024f7c93428a383b813a7cfc94e71a409 /drivers/usb/host/ohci-hub.c
parent4147200d25c423e627ab4487530b3d9f2ef829c8 (diff)
USB: controller resume should check the root hub
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>
Diffstat (limited to 'drivers/usb/host/ohci-hub.c')
-rw-r--r--drivers/usb/host/ohci-hub.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index 4dd39022c388..cddcda95b579 100644
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -355,6 +355,11 @@ static void ohci_finish_controller_resume(struct usb_hcd *hcd)
ohci_readl(ohci, &ohci->regs->intrenable);
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);
}
/* Carry out polling-, autostop-, and autoresume-related state changes */
@@ -364,7 +369,7 @@ static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
int poll_rh = 1;
int rhsc_enable;
- /* Some broken controllers never turn off RHCS in the interrupt
+ /* Some broken controllers never turn off RHSC in the interrupt
* status register. For their sake we won't re-enable RHSC
* interrupts if the interrupt bit is already active.
*/