iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ACPI: PM: Check states of power resources during initialization

Browse Source 
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>
This commit is contained in:
Rafael J. Wysocki 2021-10-15 19:14:10 +02:00
parent bc28368596
commit a1224f34d7
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/acpi/power.c
View File

@ -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;