diff options
| author | Aaron Lu <aaron.lu@amd.com> | 2012-06-25 16:13:09 +0800 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2012-06-29 11:38:45 -0400 |
| commit | 166a2967b45ede2e2e56f3ede3cd32053dc17812 (patch) | |
| tree | e1cb8b667281fc42512f1e4656292789e76bb5f3 /drivers/ata | |
| parent | b1354cbb5bfce28f2e1ed28d77b362dfdfca638d (diff) | |
| download | lwn-166a2967b45ede2e2e56f3ede3cd32053dc17812.tar.gz lwn-166a2967b45ede2e2e56f3ede3cd32053dc17812.zip | |
libata: tell scsi layer device supports runtime power off
If ATA device supports "Device Attention", then tell scsi layer that
the device supports runtime power off.
Signed-off-by: Aaron Lu <aaron.lu@amd.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-acpi.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c index f36284e3290d..f1d6901de37d 100644 --- a/drivers/ata/libata-acpi.c +++ b/drivers/ata/libata-acpi.c @@ -1000,7 +1000,10 @@ static void ata_acpi_add_pm_notifier(struct ata_device *dev) return; status = acpi_bus_get_device(handle, &acpi_dev); - if (ACPI_SUCCESS(status)) { + if (ACPI_FAILURE(status)) + return; + + if (dev->sdev->can_power_off) { acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, ata_acpi_wake_dev, dev); device_set_run_wake(&dev->sdev->sdev_gendev, true); @@ -1018,7 +1021,10 @@ static void ata_acpi_remove_pm_notifier(struct ata_device *dev) return; status = acpi_bus_get_device(handle, &acpi_dev); - if (ACPI_SUCCESS(status)) { + if (ACPI_FAILURE(status)) + return; + + if (dev->sdev->can_power_off) { device_set_run_wake(&dev->sdev->sdev_gendev, false); acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, ata_acpi_wake_dev); @@ -1102,6 +1108,9 @@ static int ata_acpi_bind_device(struct ata_port *ap, struct scsi_device *sdev, acpi_handle *handle) { struct ata_device *ata_dev; + acpi_status status; + struct acpi_device *acpi_dev; + struct acpi_device_power_state *states; if (ap->flags & ATA_FLAG_ACPI_SATA) ata_dev = &ap->link.device[sdev->channel]; @@ -1113,6 +1122,21 @@ static int ata_acpi_bind_device(struct ata_port *ap, struct scsi_device *sdev, if (!*handle) return -ENODEV; + status = acpi_bus_get_device(*handle, &acpi_dev); + if (ACPI_FAILURE(status)) + return 0; + + /* + * If firmware has _PS3 or _PR3 for this device, + * and this ata ODD device support device attention, + * it means this device can be powered off + */ + states = acpi_dev->power.states; + if ((states[ACPI_STATE_D3_HOT].flags.valid || + states[ACPI_STATE_D3_COLD].flags.explicit_set) && + ata_dev->flags & ATA_DFLAG_DA) + sdev->can_power_off = 1; + return 0; } |