diff options
Diffstat (limited to 'drivers/ata/libata-acpi.c')
-rw-r--r-- | drivers/ata/libata-acpi.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c index 7bf4befd96bc..ebc4dfcf2f19 100644 --- a/drivers/ata/libata-acpi.c +++ b/drivers/ata/libata-acpi.c | |||
@@ -776,6 +776,36 @@ void ata_acpi_on_resume(struct ata_port *ap) | |||
776 | } | 776 | } |
777 | 777 | ||
778 | /** | 778 | /** |
779 | * ata_acpi_set_state - set the port power state | ||
780 | * @ap: target ATA port | ||
781 | * @state: state, on/off | ||
782 | * | ||
783 | * This function executes the _PS0/_PS3 ACPI method to set the power state. | ||
784 | * ACPI spec requires _PS0 when IDE power on and _PS3 when power off | ||
785 | */ | ||
786 | void ata_acpi_set_state(struct ata_port *ap, pm_message_t state) | ||
787 | { | ||
788 | struct ata_device *dev; | ||
789 | |||
790 | if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA)) | ||
791 | return; | ||
792 | |||
793 | /* channel first and then drives for power on and vica versa | ||
794 | for power off */ | ||
795 | if (state.event == PM_EVENT_ON) | ||
796 | acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0); | ||
797 | |||
798 | ata_link_for_each_dev(dev, &ap->link) { | ||
799 | if (dev->acpi_handle && ata_dev_enabled(dev)) | ||
800 | acpi_bus_set_power(dev->acpi_handle, | ||
801 | state.event == PM_EVENT_ON ? | ||
802 | ACPI_STATE_D0 : ACPI_STATE_D3); | ||
803 | } | ||
804 | if (state.event != PM_EVENT_ON) | ||
805 | acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3); | ||
806 | } | ||
807 | |||
808 | /** | ||
779 | * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration | 809 | * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration |
780 | * @dev: target ATA device | 810 | * @dev: target ATA device |
781 | * | 811 | * |