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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: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2006-09-25 15:41:21 -04:00 committed by Greg Kroah-Hartman
parent d19ac7da72
commit 1f7e1a3b7e
1 changed files with 6 additions and 44 deletions
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50
drivers/usb/host/ohci-hub.c
View File

@ -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;