Commit b7dd6298 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI: PM: Introduce acpi_dev_power_up_children_with_adr() 



Introduce a function powering up all of the children of a given ACPI
device object that are power-manageable and hold valid _ADR ACPI
objects so as to make it possible to prepare the corresponding
"physical" devices for enumeration carried out by a bus type driver,
like PCI.

This function will be used in a subsequent change set.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent cf6ba075

drivers/acpi/device_pm.c

+30 −0
Original line number Diff line number Diff line
@@ -425,6 +425,36 @@ bool acpi_bus_power_manageable(acpi_handle handle) 
}

EXPORT_SYMBOL(acpi_bus_power_manageable);



static int acpi_power_up_if_adr_present(struct device *dev, void *not_used)

{

	struct acpi_device *adev;



	adev = to_acpi_device(dev);

	if (!(adev->flags.power_manageable && adev->pnp.type.bus_address))

		return 0;



	acpi_handle_debug(adev->handle, "Power state: %s\n",

			  acpi_power_state_string(adev->power.state));



	if (adev->power.state == ACPI_STATE_D3_COLD)

		return acpi_device_set_power(adev, ACPI_STATE_D0);



	return 0;

}



/**

 * acpi_dev_power_up_children_with_adr - Power up childres with valid _ADR

 * @adev: Parent ACPI device object.

 *

 * Change the power states of the direct children of @adev that are in D3cold

 * and hold valid _ADR objects to D0 in order to allow bus (e.g. PCI)

 * enumeration code to access them.

 */

void acpi_dev_power_up_children_with_adr(struct acpi_device *adev)

{

	acpi_dev_for_each_child(adev, acpi_power_up_if_adr_present, NULL);

}



#ifdef CONFIG_PM

static DEFINE_MUTEX(acpi_pm_notifier_lock);

static DEFINE_MUTEX(acpi_pm_notifier_install_lock);

include/acpi/acpi_bus.h

+1 −0
Original line number Diff line number Diff line
@@ -524,6 +524,7 @@ int acpi_device_fix_up_power(struct acpi_device *device); 
int acpi_bus_update_power(acpi_handle handle, int *state_p);

int acpi_device_update_power(struct acpi_device *device, int *state_p);

bool acpi_bus_power_manageable(acpi_handle handle);

void acpi_dev_power_up_children_with_adr(struct acpi_device *adev);

int acpi_device_power_add_dependent(struct acpi_device *adev,

				    struct device *dev);

void acpi_device_power_remove_dependent(struct acpi_device *adev,