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| author | Kristen Carlson Accardi <kristen.c.accardi@intel.com> | 2007-10-25 00:58:59 -0400 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-10-29 11:00:35 -0400 |
| commit | ca77329fb713b7fea6a307068e0dd0248e7aa640 (patch) | |
| tree | 6a1b987f489d7c3f0bbe81647b4ee2b0216afe8a /drivers/ata/libata.h | |
| parent | ab6fc95f609b372a19e18ea689986846ab1ba29c (diff) | |
| download | linux-ca77329fb713b7fea6a307068e0dd0248e7aa640.tar.gz linux-ca77329fb713b7fea6a307068e0dd0248e7aa640.tar.bz2 linux-ca77329fb713b7fea6a307068e0dd0248e7aa640.zip | |
[libata] Link power management infrastructure
Device Initiated Power Management, which is defined
in SATA 2.5 can be enabled for disks which support it.
This patch enables DIPM when the user sets the link
power management policy to "min_power".
Additionally, libata drivers can define a function
(enable_pm) that will perform hardware specific actions to
enable whatever power management policy the user set up
for Host Initiated Power management (HIPM).
This power management policy will be activated after all
disks have been enumerated and intialized. Drivers should
also define disable_pm, which will turn off link power
management, but not change link power management policy.
Documentation/scsi/link_power_management_policy.txt has additional
information.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata.h')
| -rw-r--r-- | drivers/ata/libata.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h index 90df58a3edc9..0e6cf3a484dc 100644 --- a/drivers/ata/libata.h +++ b/drivers/ata/libata.h @@ -101,6 +101,8 @@ extern int sata_link_init_spd(struct ata_link *link); extern int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg); extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg); extern struct ata_port *ata_port_alloc(struct ata_host *host); +extern void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy); +extern void ata_lpm_schedule(struct ata_port *ap, enum link_pm); /* libata-acpi.c */ #ifdef CONFIG_ATA_ACPI |