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USB: switch ehci-hcd to new polling scheme

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Switch ehci-hcd to use the new polling scheme, which reports root
hub status changes via the interrupt handler, in an asynchronous
fashion. Doing so disables polling for status changes (whose handler is
rh_timer_func).

Tested on a Geode GX machine, which is now capable of running at =~ 5
timer interrupts per second (in the -rt tree), resulting in significant
power savings.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Marcelo Tosatti 2007-01-21 19:45:59 -02:00 committed by Greg Kroah-Hartman
parent d053218408
commit 1d619f128b
1 changed files with 7 additions and 1 deletions
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8
drivers/usb/host/ehci-hcd.c
View file

@ -501,6 +501,9 @@ static int ehci_run (struct usb_hcd *hcd)
u32 temp;
u32 hcc_params;
hcd->uses_new_polling = 1;
hcd->poll_rh = 0;
/* EHCI spec section 4.1 */
if ((retval = ehci_reset(ehci)) != 0) {
ehci_mem_cleanup(ehci);
@ -574,7 +577,7 @@ static int ehci_run (struct usb_hcd *hcd)
static irqreturn_t ehci_irq (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 status;
u32 status, pcd_status = 0;
int bh;
spin_lock (&ehci->lock);
@ -624,6 +627,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
/* remote wakeup [4.3.1] */
if (status & STS_PCD) {
unsigned i = HCS_N_PORTS (ehci->hcs_params);
pcd_status = status;
/* resume root hub? */
if (!(ehci_readl(ehci, &ehci->regs->command) & CMD_RUN))
@ -670,6 +674,8 @@ dead:
if (bh)
ehci_work (ehci);
spin_unlock (&ehci->lock);
if (pcd_status & STS_PCD)
usb_hcd_poll_rh_status(hcd);
return IRQ_HANDLED;
}