tree f23d1207718ee18218ce4267cbcb0f361456e818
parent 24b7f0592f738a1127c72dbf5b72a83997dd6997
author Kai-Heng Feng <kai.heng.feng@canonical.com> 1496820342 +0800
committer Christoph Hellwig <hch@lst.de> 1496826534 +0200

nvme: only consider exit latency when choosing useful non-op power states

When a NVMe is in non-op states, the latency is exlat.
The latency will be enlat + exlat only when the NVMe tries to transit
from operational state right atfer it begins to transit to
non-operational state, which should be a rare case.

Therefore, as Andy Lutomirski suggests, use exlat only when deciding power
states to trainsit to.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>