tree cf84dccb916f90e445c08b244939a25203874aec
parent 07d92760d2ee542fe932f4e8b5807dd98481d1fd
author Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> 1250647297 +0900
committer Jesse Barnes <jbarnes@virtuousgeek.org> 1252528188 -0700

PCI ASPM: support partial aspm enablement

In the current implementation, ASPM L0s/L1 is disabled for all links
in the hierarchy if one of the link doesn't meet latency requirement.
But we can partially enable ASPM L0s/L1 on sub-tree in the hierarchy.
This patch allows partial L0s/L1 enablement in the hierarchy. And it
also reduce the calculation cost of ASPM configuration very much.

In the previous implementation, all links were enabled with the same
state. With this patch, enabled state for each link is determined
simply as follows (the 'requested' is from policy_to_aspm_state()).

    enabled = requested & (link->aspm_capable & link->aspm_disable)

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>