From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
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@xxxxxxxxx>
---
drivers/acpi/device_pm.c | 30 ++++++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 1 +
2 files changed, 31 insertions(+)
Index: linux-pm/drivers/acpi/device_pm.c
===================================================================
--- linux-pm.orig/drivers/acpi/device_pm.c
+++ linux-pm/drivers/acpi/device_pm.c
@@ -427,6 +427,36 @@ bool acpi_bus_power_manageable(acpi_hand
}
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);
Index: linux-pm/include/acpi/acpi_bus.h
===================================================================
--- linux-pm.orig/include/acpi/acpi_bus.h
+++ linux-pm/include/acpi/acpi_bus.h
@@ -525,6 +525,7 @@ int acpi_device_fix_up_power(struct acpi
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,
