From e3567d2c15a7a8e2f992a5f7c7683453ca406d82 Mon Sep 17 00:00:00 2001
From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Date: Wed, 16 May 2012 13:36:24 -0700
Subject: [PATCH] xhci: Add Intel U1/U2 timeout policy.

All Intel xHCI host controllers support USB 3.0 Link Power Management.

The Panther Point xHCI host controller needs the xHCI driver to
calculate the U1 and U2 timeout values, because it will blindly accept a
MEL that would cause scheduling issues.

The Lynx Point xHCI host controller will reject MEL values that are too
high, but internally it implements the same algorithm that is needed for
Panther Point xHCI.

Simplify the code paths by just having the xHCI driver calculate what
the U1/U2 timeouts should be.  Comments on the policy are in the code.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
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