From: Rafael J. Wysocki Date: Fri, 15 Oct 2021 17:14:10 +0000 (+0200) Subject: ACPI: PM: Check states of power resources during initialization X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a1224f34d72a103829d6953935d6c6621f135b83;p=linux.git ACPI: PM: Check states of power resources during initialization To avoid situations in which the actual states of certain ACPI power resources are not known just because they have never been referenced by any device configuration objects, check the initial states of all power resources as soon as they are found in the ACPI namespace (and fall back to turning them on if the state check fails). Signed-off-by: Rafael J. Wysocki Tested-by: Andreas K. Huettel --- diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index f0ed4414edb1f..bb03fb0eaa0e2 100644 --- a/drivers/acpi/power.c +++ b/drivers/acpi/power.c @@ -943,6 +943,7 @@ struct acpi_device *acpi_add_power_resource(acpi_handle handle) union acpi_object acpi_object; struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; acpi_status status; + u8 state_dummy; int result; acpi_bus_get_device(handle, &device); @@ -971,6 +972,10 @@ struct acpi_device *acpi_add_power_resource(acpi_handle handle) resource->order = acpi_object.power_resource.resource_order; resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN; + /* Get the initial state or just flip it on if that fails. */ + if (acpi_power_get_state(resource, &state_dummy)) + __acpi_power_on(resource); + pr_info("%s [%s]\n", acpi_device_name(device), acpi_device_bid(device)); device->flags.match_driver = true;