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| author |   Kristen Carlson Accardi <kristen.c.accardi@intel.com> | 2007-10-25 01:33:26 -0400 |
|---|---|---|
| committer |   Jeff Garzik <jeff@garzik.org> | 2007-10-29 11:00:35 -0400 |
| commit | 31556594f913fa81d008cecfe46d7211c919a853 (patch) | |
| tree | 424db37711a0805aef50f6e76b8686eb36ab5147 /include | |
| parent | [libata] Link power management infrastructure (diff) | |
| download | linux-dev-31556594f913fa81d008cecfe46d7211c919a853.tar.xz linux-dev-31556594f913fa81d008cecfe46d7211c919a853.zip | |
[libata] AHCI: add hw link power management support
This patch will set the correct bits to turn on Aggressive
Link Power Management (ALPM) for the ahci driver. This
will cause the controller and disk to negotiate a lower
power state for the link when there is no activity (see
the AHCI 1.x spec for details). This feature is mutually
exclusive with Hot Plug, so when ALPM is enabled, Hot Plug
is disabled. ALPM will be enabled by default, but it is
settable via the scsi host syfs interface. Possible
settings for this feature are:
Setting Effect
----------------------------------------------------------
min_power ALPM is enabled, and link set to enter
lowest power state (SLUMBER) when idle
Hot plug not allowed.
max_performance ALPM is disabled, Hot Plug is allowed
medium_power ALPM is enabled, and link set to enter
second lowest power state (PARTIAL) when
idle. Hot plug not allowed.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions