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Commit 1f7e1a3b authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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OHCI: remove existing autosuspend code 



The autosuspend technique used by ohci-hcd doesn't mesh well with the
newer USB core autosuspend code.  This patch (as789) removes ohci-hcd's
autosuspend support.  Now the driver will be usable, but it won't
automatically go into a low-power state when no devices are connected.
That's for a later patch.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent d19ac7da

drivers/usb/host/ohci-hub.c

+6 −44
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ static void ohci_rhsc_enable (struct usb_hcd *hcd) 
{

	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);



	hcd->poll_rh = 0;

	ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);

}
@@ -117,8 +118,10 @@ static int ohci_bus_suspend (struct usb_hcd *hcd) 
	/* maybe resume can wake root hub */

	if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev))

		ohci->hc_control |= OHCI_CTRL_RWE;

	else

	else {

		ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);

		ohci->hc_control &= ~OHCI_CTRL_RWE;

	}



	/* Suspend hub ... this is the "global (to this bus) suspend" mode,

	 * which doesn't imply ports will first be individually suspended.
@@ -310,20 +313,16 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf) 
{

	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);

	int		i, changed = 0, length = 1;

	int		can_suspend;

	unsigned long	flags;



	can_suspend = device_may_wakeup(&hcd->self.root_hub->dev);

	spin_lock_irqsave (&ohci->lock, flags);



	/* handle autosuspended root:  finish resuming before

	 * letting khubd or root hub timer see state changes.

	 */

	if (unlikely((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER

		     || !HC_IS_RUNNING(hcd->state))) {

		can_suspend = 0;

		     || !HC_IS_RUNNING(hcd->state)))

		goto done;

	}



	/* undocumented erratum seen on at least rev D */

	if ((ohci->flags & OHCI_QUIRK_AMD756)
@@ -348,10 +347,6 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf) 
	for (i = 0; i < ohci->num_ports; i++) {

		u32	status = roothub_portstatus (ohci, i);



		/* can't autosuspend with active ports */

		if ((status & RH_PS_PES) && !(status & RH_PS_PSS))

			can_suspend = 0;



		if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC

				| RH_PS_OCIC | RH_PS_PRSC)) {

			changed = 1;
@@ -366,42 +361,12 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf) 
	/* after root hub changes, stop polling after debouncing

	 * for a while and maybe kicking in autosuspend

	 */

	if (changed) {

	if (changed)

		ohci->next_statechange = jiffies + STATECHANGE_DELAY;

		can_suspend = 0;

	} else if (time_before (jiffies, ohci->next_statechange)) {

		can_suspend = 0;

	} else {

#ifdef	CONFIG_PM

		can_suspend = can_suspend

			&& !ohci->ed_rm_list

			&& ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES)

					& ohci->hc_control)

				== OHCI_USB_OPER;

#endif

		if (hcd->uses_new_polling) {

			hcd->poll_rh = 0;

			/* use INTR_RHSC iff INTR_RD won't apply */

			if (!can_suspend)

				ohci_writel (ohci, OHCI_INTR_RHSC,

						&ohci->regs->intrenable);

		}

	}



done:

	spin_unlock_irqrestore (&ohci->lock, flags);



#ifdef	CONFIG_PM

	/* save power by autosuspending idle root hubs;

	 * INTR_RD wakes us when there's work

	 */

	if (can_suspend && usb_trylock_device (hcd->self.root_hub) == 0) {

		ohci_vdbg (ohci, "autosuspend\n");

		(void) ohci_bus_suspend (hcd);

		usb_unlock_device (hcd->self.root_hub);

	}

#endif



	return changed ? length : 0;

}
@@ -572,9 +537,6 @@ static int ohci_hub_control ( 
			break;

		case USB_PORT_FEAT_SUSPEND:

			temp = RH_PS_POCI;

			if ((ohci->hc_control & OHCI_CTRL_HCFS)

					!= OHCI_USB_OPER)

				usb_hcd_resume_root_hub(hcd);

			break;

		case USB_PORT_FEAT_C_SUSPEND:

			temp = RH_PS_PSSC;