>From b076459721690a5a03bc6490d0a98237ada74628 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 module parameter to specify EHCI_IO_JIFFIES
The default EHCI_IO_JIFFIES is just waking up system too much (~10 times per
second) and it won't benefit those no interrupt quirk EHCI controllers. This
patch adds an io_jiffies parameter to ehci-hcd, user either could specify the
parameter during modprobe time or provide ehci-hcd.io_jiffies=xxxx in kernel
cmdline for ehci-hcd built-in case.
Signed-off-by: Alek Du <alek.du@xxxxxxxxx>
---
drivers/usb/host/ehci-hcd.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index c637207..4821ace 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -101,6 +101,11 @@ static int ignore_oc = 0;
module_param (ignore_oc, bool, S_IRUGO);
MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
+static unsigned int io_jiffies = EHCI_IO_JIFFIES;
+module_param(io_jiffies, int, S_IRUGO);
+MODULE_PARM_DESC(io_jiffies,
+ "ehci_watchdog scheduling jiffies (default HZ/10)\n");
+
#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
/*-------------------------------------------------------------------------*/
@@ -127,7 +132,7 @@ timer_action(struct ehci_hcd *ehci, enum ehci_timer_action action)
switch (action) {
case TIMER_IO_WATCHDOG:
- t = EHCI_IO_JIFFIES;
+ t = io_jiffies;
break;
case TIMER_ASYNC_OFF:
t = EHCI_ASYNC_JIFFIES;
--
1.6.0.4
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