From: Matthew Garrett Date: Thu, 6 Oct 2011 19:35:43 +0000 (-0400) Subject: USB: Fix runtime wakeup on OHCI X-Git-Tag: v3.0.9~220 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f72d6f85aa5857d889a2b4a41f2bd6be4918703a;p=karo-tx-linux.git USB: Fix runtime wakeup on OHCI commit a8b43c00ef06aec49b9fe0a5bad8a6a320e4d27b upstream. 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 Cc: Alan Stern Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c index 9154615292db..2f00040fc408 100644 --- a/drivers/usb/host/ohci-hub.c +++ b/drivers/usb/host/ohci-hub.c @@ -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 */