From: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Date: Wed, 19 Aug 2009 02:00:25 +0000 (+0900)
Subject: PCI ASPM: introduce capable flag
X-Git-Tag: v2.6.32-rc1~670^2~41
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=07d92760d2ee542fe932f4e8b5807dd98481d1fd;p=pandora-kernel.git

PCI ASPM: introduce capable flag

Introduce 'aspm_capable' field to maintain the capable ASPM setting of
the link. By the 'aspm_capable', we don't need to recheck latency
every time ASPM policy is changed.

Each bit in 'aspm_capable' is associated to ASPM state (L0S/L1). The
bit is set if the associated ASPM state is supported by the link and
it satisfies the latency requirement (i.e. exit latency < endpoint
acceptable latency). The 'aspm_capable' is updated when

  - an endpoint device is added (boot time or hot-plug time)
  - an endpoint device is removed (hot-unplug time)
  - PCI power state is changed.

Acked-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---

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