From: Len Brown <len.brown@intel.com>
Date: Wed, 20 Jan 2010 04:10:04 +0000 (-0500)
Subject: ACPI: allow C3 > 1000usec
X-Git-Tag: v2.6.33-rc5~9^2~5^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6d72c189f6c4292ba1a323e8af24083790529f8;p=pandora-kernel.git

ACPI: allow C3 > 1000usec

Do for C3 what the previous patch did for C2.

The C2 patch was in response to a highly visible
and multiply reported C-state/turbo failure,
while this change has no bug report in-hand.

This will enable C3 in Linux on systems where BIOS
overstates C3 latency in _CST.  It will also enable
future systems which may actually have C3 > 1000usec.

Linux has always ignored ACPI BIOS C3 with exit latency > 1000 usec,
and the ACPI spec is clear that is correct FADT-supplied C3.

However, the ACPI spec explicitly states that _CST-supplied C-states
have no latency limits.

So move the 1000usec C3 test out of the code shared
by FADT and _CST code-paths, and into the FADT-specific path.

Signed-off-by: Len Brown <len.brown@intel.com>
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