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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>
This commit is contained in:
Aaron Lu 2012-06-25 16:13:09 +08:00 committed by Jeff Garzik
parent b1354cbb5b
commit 166a2967b4
2 changed files with 27 additions and 2 deletions
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28
drivers/ata/libata-acpi.c
View File

@ -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;
}

1
include/scsi/scsi_device.h
View File

@ -153,6 +153,7 @@ struct scsi_device {
unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
unsigned is_visible:1; /* is the device visible in sysfs */
unsigned can_power_off:1; /* Device supports runtime power off */
DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
struct list_head event_list; /* asserted events */