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ACPI: PM: Introduce acpi_dev_power_up_children_with_adr()

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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: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Rafael J. Wysocki 2022-04-04 17:23:13 +02:00
parent cf6ba0750a
commit b7dd6298db
2 changed files with 31 additions and 0 deletions
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30
drivers/acpi/device_pm.c
View file

@ -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);

1
include/acpi/acpi_bus.h
View file

@ -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,