From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Fri, 15 Oct 2021 19:14:10 +0200
Subject: ACPI: PM: Check states of power resources during initialization
Patch-mainline: v5.16-rc1
Git-commit: a1224f34d72a103829d6953935d6c6621f135b83
References: jsc#PED-1408

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 <rafael.j.wysocki@intel.com>
Tested-by: Andreas K. Huettel <andreas.huettel@ur.de>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
 drivers/acpi/power.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -943,6 +943,7 @@ struct acpi_device *acpi_add_power_resou
 	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_resou
 	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;