diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-04-04 18:23:13 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-04-13 18:26:22 +0300 |
| commit | b7dd6298db81ea6dd902f1787eaf9a43228e2707 (patch) | |
| tree | 7e7441978de497412d45c815b344957e17445f59 | |
| parent | cf6ba0750a22a54f5101986401271429995cc4a0 (diff) | |
| download | linux-b7dd6298db81ea6dd902f1787eaf9a43228e2707.tar.xz | |
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: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
| -rw-r--r-- | drivers/acpi/device_pm.c | 30 | ||||
| -rw-r--r-- | include/acpi/acpi_bus.h | 1 |
2 files changed, 31 insertions, 0 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index cc6c97e7dcae..83598b11a7cc 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -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); diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index c616f3d8506b..b44aaffedb91 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -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, |