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USB: EHCI: add need_io_watchdog flag to ehci_hcd 

Basically the io watchdog is only useful for those quirk HCDs. For most
good ones, it only brings unnecessary wakeups.  At least, I know the
Intel EHCI HCDs should turn off the flag.

Signed-off-by: Alek Du <alek.du@intel.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alek Du 2009-07-13 17:30:41 +08:00 committed by Greg Kroah-Hartman
parent 4d155eb5f5
commit 403dbd3673
3 changed files with 10 additions and 0 deletions
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6
drivers/usb/host/ehci-hcd.c
View File

@ -127,6 +127,8 @@ timer_action(struct ehci_hcd *ehci, enum ehci_timer_action action)
switch (action) {
case TIMER_IO_WATCHDOG:
if (!ehci->need_io_watchdog)
return;
t = EHCI_IO_JIFFIES;
break;
case TIMER_ASYNC_OFF:
@ -508,6 +510,10 @@ static int ehci_init(struct usb_hcd *hcd)
spin_lock_init(&ehci->lock);
/*
* keep io watchdog by default, those good HCDs could turn off it later
*/
ehci->need_io_watchdog = 1;
init_timer(&ehci->watchdog);
ehci->watchdog.function = ehci_watchdog;
ehci->watchdog.data = (unsigned long) ehci;

3
drivers/usb/host/ehci-pci.c
View File

@ -129,6 +129,9 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
return retval;
switch (pdev->vendor) {
case PCI_VENDOR_ID_INTEL:
ehci->need_io_watchdog = 0;
break;
case PCI_VENDOR_ID_TDI:
if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
hcd->has_tt = 1;

1
drivers/usb/host/ehci.h
View File

@ -126,6 +126,7 @@ struct ehci_hcd { /* one per controller */
unsigned big_endian_mmio:1;
unsigned big_endian_desc:1;
unsigned has_amcc_usb23:1;
unsigned need_io_watchdog:1;
/* required for usb32 quirk */
#define OHCI_CTRL_HCFS (3 << 6)