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ehci_watchdog will wake up CPU very frequently so that CPU
stays at C3 very short, average residence time is about 50
ms on Aspire One, but we expect it should be about 1 second
or more, so this kind of periodic timer is very bad for power
saving.
We can't remove this timer because of some bad USB controller
chipset, but at least we should reduce its side effect to as
possible as low.
This patch can make CPU stay at C3 longer, average residence time
is about twice as long as original.
Please consider to apply it, thanks
Signed-off-by: Yi Yang <yi.y.yang@intel.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
f0d781d59c