diff mbox series

[1/2] ACPI: PM: Add acpi_device_fix_up_power_children() function

Message ID 20231112203627.34059-2-hdegoede@redhat.com (mailing list archive)
State Mainlined, archived
Headers show
Series ACPI: video: Use acpi_device_fix_up_power_children() | expand

Commit Message

Hans de Goede Nov. 12, 2023, 8:36 p.m. UTC 
In some cases it is necessary to fix-up the power-state of an ACPI
device's children without touching the ACPI device itself add
a new acpi_device_fix_up_power_children() function for this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/acpi/device_pm.c | 13 +++++++++++++
 include/acpi/acpi_bus.h  |  1 +
 2 files changed, 14 insertions(+)

Comments

Greg KH Nov. 13, 2023, 2:32 p.m. UTC | #1 
On Sun, Nov 12, 2023 at 09:36:26PM +0100, Hans de Goede wrote:
> In some cases it is necessary to fix-up the power-state of an ACPI
> device's children without touching the ACPI device itself add
> a new acpi_device_fix_up_power_children() function for this.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
>  drivers/acpi/device_pm.c | 13 +++++++++++++
>  include/acpi/acpi_bus.h  |  1 +
>  2 files changed, 14 insertions(+)
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>
diff mbox series

Patch

diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index f007116a8427..3b4d048c4941 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -397,6 +397,19 @@  void acpi_device_fix_up_power_extended(struct acpi_device *adev)
 }
 EXPORT_SYMBOL_GPL(acpi_device_fix_up_power_extended);
 
+/**
+ * acpi_device_fix_up_power_children - Force a device's children into D0.
+ * @adev: Parent device object whose children's power state is to be fixed up.
+ *
+ * Call acpi_device_fix_up_power() for @adev's children so long as they
+ * are reported as present and enabled.
+ */
+void acpi_device_fix_up_power_children(struct acpi_device *adev)
+{
+	acpi_dev_for_each_child(adev, fix_up_power_if_applicable, NULL);
+}
+EXPORT_SYMBOL_GPL(acpi_device_fix_up_power_children);
+
 int acpi_device_update_power(struct acpi_device *device, int *state_p)
 {
 	int state;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 254685085c82..0b7eab0ef7d7 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -539,6 +539,7 @@  int acpi_device_set_power(struct acpi_device *device, int state);
 int acpi_bus_init_power(struct acpi_device *device);
 int acpi_device_fix_up_power(struct acpi_device *device);
 void acpi_device_fix_up_power_extended(struct acpi_device *adev);
+void acpi_device_fix_up_power_children(struct acpi_device *adev);
 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);