diff options
Diffstat (limited to 'drivers/ide/ide-acpi.c')
-rw-r--r-- | drivers/ide/ide-acpi.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/ide/ide-acpi.c b/drivers/ide/ide-acpi.c index 17aea65d7dd2..6bff81a58bf3 100644 --- a/drivers/ide/ide-acpi.c +++ b/drivers/ide/ide-acpi.c | |||
@@ -612,6 +612,46 @@ void ide_acpi_push_timing(ide_hwif_t *hwif) | |||
612 | EXPORT_SYMBOL_GPL(ide_acpi_push_timing); | 612 | EXPORT_SYMBOL_GPL(ide_acpi_push_timing); |
613 | 613 | ||
614 | /** | 614 | /** |
615 | * ide_acpi_set_state - set the channel power state | ||
616 | * @hwif: target IDE interface | ||
617 | * @on: state, on/off | ||
618 | * | ||
619 | * This function executes the _PS0/_PS3 ACPI method to set the power state. | ||
620 | * ACPI spec requires _PS0 when IDE power on and _PS3 when power off | ||
621 | */ | ||
622 | void ide_acpi_set_state(ide_hwif_t *hwif, int on) | ||
623 | { | ||
624 | int unit; | ||
625 | |||
626 | if (ide_noacpi) | ||
627 | return; | ||
628 | |||
629 | DEBPRINT("ENTER:\n"); | ||
630 | |||
631 | if (!hwif->acpidata) { | ||
632 | DEBPRINT("no ACPI data for %s\n", hwif->name); | ||
633 | return; | ||
634 | } | ||
635 | /* channel first and then drives for power on and verse versa for power off */ | ||
636 | if (on) | ||
637 | acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0); | ||
638 | for (unit = 0; unit < MAX_DRIVES; ++unit) { | ||
639 | ide_drive_t *drive = &hwif->drives[unit]; | ||
640 | |||
641 | if (!drive->acpidata->obj_handle) | ||
642 | drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive); | ||
643 | |||
644 | if (drive->acpidata->obj_handle && drive->present) { | ||
645 | acpi_bus_set_power(drive->acpidata->obj_handle, | ||
646 | on? ACPI_STATE_D0: ACPI_STATE_D3); | ||
647 | } | ||
648 | } | ||
649 | if (!on) | ||
650 | acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3); | ||
651 | } | ||
652 | EXPORT_SYMBOL_GPL(ide_acpi_set_state); | ||
653 | |||
654 | /** | ||
615 | * ide_acpi_init - initialize the ACPI link for an IDE interface | 655 | * ide_acpi_init - initialize the ACPI link for an IDE interface |
616 | * @hwif: target IDE interface (channel) | 656 | * @hwif: target IDE interface (channel) |
617 | * | 657 | * |
@@ -679,6 +719,8 @@ void ide_acpi_init(ide_hwif_t *hwif) | |||
679 | return; | 719 | return; |
680 | } | 720 | } |
681 | 721 | ||
722 | /* ACPI _PS0 before _STM */ | ||
723 | ide_acpi_set_state(hwif, 1); | ||
682 | /* | 724 | /* |
683 | * ACPI requires us to call _STM on startup | 725 | * ACPI requires us to call _STM on startup |
684 | */ | 726 | */ |