Diffstat (limited to 'drivers/acpi/device_pm.c')
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 318fa32a141..31c217a4283 100644
@@ -290,6 +290,26 @@ int acpi_bus_init_power(struct acpi_device *device)
+ * acpi_device_fix_up_power - Force device with missing _PSC into D0.
+ * @device: Device object whose power state is to be fixed up.
+ * Devices without power resources and _PSC, but having _PS0 and _PS3 defined,
+ * are assumed to be put into D0 by the BIOS. However, in some cases that may
+ * not be the case and this function should be used then.
+int acpi_device_fix_up_power(struct acpi_device *device)
+ int ret = 0;
+ if (!device->power.flags.power_resources
+ && !device->power.flags.explicit_get
+ && device->power.state == ACPI_STATE_D0)
+ ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
+ return ret;
int acpi_bus_update_power(acpi_handle handle, int *state_p)
struct acpi_device *device;