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[PATCH] UHCI: Improve FSBR-off timing

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This patch (as707) improves the FSBR operation in uhci-hcd by turning it
off more quickly when it isn't needed.  FSBR puts a noticeable load on a
computer's PCI bus, so it should be disabled as soon as possible when it
isn't in use.  The patch leaves it running for only 10 ms after the last
URB stops using it, on the theory that this should be long enough for a
driver to submit another URB if it wants keep FSBR going.

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
2006-06-05 12:28:57 -04:00
committed by Greg Kroah-Hartman
parent e323de46e8
commit c5e3b741a3
3 changed files with 59 additions and 25 deletions
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5
drivers/usb/host/uhci-hcd.c
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@@ -497,9 +497,9 @@ static int uhci_start(struct usb_hcd *hcd)
hcd->uses_new_polling = 1;
spin_lock_init(&uhci->lock);
setup_timer(&uhci->fsbr_timer, uhci_fsbr_timeout,
(unsigned long) uhci);
INIT_LIST_HEAD(&uhci->idle_qh_list);
init_waitqueue_head(&uhci->waitqh);
if (DEBUG_CONFIGURED) {
@@ -675,6 +675,7 @@ static void uhci_stop(struct usb_hcd *hcd)
uhci_scan_schedule(uhci, NULL);
spin_unlock_irq(&uhci->lock);
del_timer_sync(&uhci->fsbr_timer);
release_uhci(uhci);
}