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 17aea65d7dd..6bff81a58bf 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) EXPORT_SYMBOL_GPL(ide_acpi_push_timing); /** + * ide_acpi_set_state - set the channel power state + * @hwif: target IDE interface + * @on: state, on/off + * + * This function executes the _PS0/_PS3 ACPI method to set the power state. + * ACPI spec requires _PS0 when IDE power on and _PS3 when power off + */ +void ide_acpi_set_state(ide_hwif_t *hwif, int on) +{ + int unit; + + if (ide_noacpi) + return; + + DEBPRINT("ENTER:\n"); + + if (!hwif->acpidata) { + DEBPRINT("no ACPI data for %s\n", hwif->name); + return; + } + /* channel first and then drives for power on and verse versa for power off */ + if (on) + acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0); + for (unit = 0; unit < MAX_DRIVES; ++unit) { + ide_drive_t *drive = &hwif->drives[unit]; + + if (!drive->acpidata->obj_handle) + drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive); + + if (drive->acpidata->obj_handle && drive->present) { + acpi_bus_set_power(drive->acpidata->obj_handle, + on? ACPI_STATE_D0: ACPI_STATE_D3); + } + } + if (!on) + acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3); +} +EXPORT_SYMBOL_GPL(ide_acpi_set_state); + +/** * ide_acpi_init - initialize the ACPI link for an IDE interface * @hwif: target IDE interface (channel) * @@ -679,6 +719,8 @@ void ide_acpi_init(ide_hwif_t *hwif) return; } + /* ACPI _PS0 before _STM */ + ide_acpi_set_state(hwif, 1); /* * ACPI requires us to call _STM on startup */ |