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>
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index f36284e..f1d6901 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -1000,7 +1000,10 @@
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 @@
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 @@
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 @@
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;
}