From: Len Brown <len.brown@intel.com>
Date: Wed, 19 Jan 2011 01:48:27 +0000 (-0500)
Subject: intel_idle: disable NHM/WSM HW C-state auto-demotion
X-Git-Tag: v2.6.37.6~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cca24e5f3fa80fc5043bae978aa26d8ffd1d7402;p=pandora-kernel.git

intel_idle: disable NHM/WSM HW C-state auto-demotion

commit 14796fca2bd22acc73dd0887248d003b0f441d08 upstream.

Hardware C-state auto-demotion is a mechanism where the HW overrides
the OS C-state request, instead demoting to a shallower state,
which is less expensive, but saves less power.

Modern Linux should generally get exactly the states it requests.
In particular, when a CPU is taken off-line, it must not be demoted, else
it can prevent the entire package from reaching deep C-states.

https://bugzilla.kernel.org/show_bug.cgi?id=25252

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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