From b7dd6298db81ea6dd902f1787eaf9a43228e2707 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 4 Apr 2022 17:23:13 +0200 Subject: 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 Reviewed-by: Mika Westerberg --- drivers/acpi/device_pm.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'drivers/acpi/device_pm.c') 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); -- cgit v1.2.3