From: Brennan Shacklett <brennan@genyes.org>
Date: Mon, 21 Oct 2013 16:20:32 +0000 (-0700)
Subject: intel_pstate: Improve accuracy by not truncating until final result
X-Git-Tag: v3.12-rc7~7^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d253d2a52676cfa3d89b8f0737a08ce7db665207;p=pandora-kernel.git

intel_pstate: Improve accuracy by not truncating until final result

This patch addresses Bug 60727
(https://bugzilla.kernel.org/show_bug.cgi?id=60727)
which was due to the truncation of intermediate values in the
calculations, which causes the code to consistently underestimate the
current cpu frequency, specifically 100% cpu utilization was truncated
down to the setpoint of 97%. This patch fixes the problem by keeping
the results of all intermediate calculations as fixed point numbers
rather scaling them back and forth between integers and fixed point.

References: https://bugzilla.kernel.org/show_bug.cgi?id=60727
Signed-off-by: Brennan Shacklett <bpshacklett@gmail.com>
Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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