From 196705c9bbc03540429b0f7cf9ee35c2f928a534 Mon Sep 17 00:00:00 2001
From: "Stuart_Hayes@Dell.com" <Stuart_Hayes@Dell.com>
Date: Thu, 3 May 2007 08:58:49 -0700
Subject: [PATCH] USB: EHCI cpufreq fix

EHCI controllers that don't cache enough microframes can get MMF errors
when CPU frequency changes occur between the start and completion of
split interrupt transactions, due to delays in reading main memory
(caused by CPU cache snoop delays).

This patch adds a cpufreq notifier to the EHCI driver that will
inactivate split interrupt transactions during frequency transitions.
It was tested on Intel ICH7 and Serverworks/Broadcom HT1000 EHCI
controllers.

Signed-off-by: Stuart Hayes <stuart_hayes@dell.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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