From ca77329fb713b7fea6a307068e0dd0248e7aa640 Mon Sep 17 00:00:00 2001 From: Kristen Carlson Accardi Date: Thu, 25 Oct 2007 00:58:59 -0400 Subject: [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 Signed-off-by: Jeff Garzik --- drivers/ata/libata-eh.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/ata/libata-eh.c') diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index ec55d63..fefea74 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -2628,6 +2628,10 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, ehc->i.flags &= ~ATA_EHI_SETMODE; } + if (ehc->i.action & ATA_EHI_LPM) + ata_link_for_each_dev(dev, link) + ata_dev_enable_pm(dev, ap->pm_policy); + /* this link is okay now */ ehc->i.flags = 0; continue; -- cgit v1.1