>From 5a1db37084a2e0de9bdc645cd7cf9a3d364855da Mon Sep 17 00:00:00 2001
From: Alek Du <alek.du@xxxxxxxxx>
Date: Wed, 10 Jun 2009 12:29:57 +0800
Subject: [PATCH] EHCI: Add no_io_watchdog feature to ehci_hcd
The IO watchdog wakes up system too much (as defined as EHCI_IO_JIFFIES, ~10
times per second) and actually it won't benefit most no interrupt quirk EHCI
controllers. Most good EHCI controllers needn't IO watchdog at all. This patch
will let them have a chance to disable it. The Intel Moorestown EHCI controller
patch will leverage it later.
Signed-off-by: Alek Du <alek.du@xxxxxxxxx>
---
drivers/usb/host/ehci-hcd.c | 2 ++
drivers/usb/host/ehci.h | 1 +
2 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index c637207..36cedc9 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -127,6 +127,8 @@ timer_action(struct ehci_hcd *ehci, enum ehci_timer_action action)
switch (action) {
case TIMER_IO_WATCHDOG:
+ if (ehci->no_io_watchdog)
+ return;
t = EHCI_IO_JIFFIES;
break;
case TIMER_ASYNC_OFF:
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 6cff195..c36d22a 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -125,6 +125,7 @@ struct ehci_hcd { /* one per controller */
unsigned big_endian_mmio:1;
unsigned big_endian_desc:1;
unsigned has_amcc_usb23:1;
+ unsigned no_io_watchdog:1;
/* required for usb32 quirk */
#define OHCI_CTRL_HCFS (3 << 6)
--
1.6.0.4
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