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Commit 166a2967 authored by Aaron Lu's avatar Aaron Lu Committed by Jeff Garzik
Browse files

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: default avatarAaron Lu <aaron.lu@amd.com>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent b1354cbb

drivers/ata/libata-acpi.c

+26 −2
Original line number Original line Diff line number Diff line
@@ -1000,7 +1000,10 @@ static void ata_acpi_add_pm_notifier(struct ata_device *dev) 
		return;

		return;





	status = acpi_bus_get_device(handle, &acpi_dev);

	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,

		acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,

			ata_acpi_wake_dev, dev);

			ata_acpi_wake_dev, dev);

		device_set_run_wake(&dev->sdev->sdev_gendev, true);

		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;

		return;





	status = acpi_bus_get_device(handle, &acpi_dev);

	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);

		device_set_run_wake(&dev->sdev->sdev_gendev, false);

		acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,

		acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,

			ata_acpi_wake_dev);

			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)

				acpi_handle *handle)

{

{

	struct ata_device *ata_dev;

	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)

	if (ap->flags & ATA_FLAG_ACPI_SATA)

		ata_dev = &ap->link.device[sdev->channel];

		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)

	if (!*handle)

		return -ENODEV;

		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;

	return 0;

}

}

include/scsi/scsi_device.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -153,6 +153,7 @@ struct scsi_device { 
	unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */

	unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */

	unsigned try_rc_10_first:1;	/* Try READ_CAPACACITY_10 first */

	unsigned try_rc_10_first:1;	/* Try READ_CAPACACITY_10 first */

	unsigned is_visible:1;	/* is the device visible in sysfs */

	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 */

	DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */

	struct list_head event_list;	/* asserted events */

	struct list_head event_list;	/* asserted events */