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From 7e4fdeafa61f2b653fcf9678f09935e55756aed2 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Thu, 18 Mar 2021 19:28:28 +0100
Subject: ACPI: power: Turn off unused power resources unconditionally
According to the ACPI specification (section 7.2.2 in ACPI 6.4), the
OS may evaluate the _OFF method of a power resource that is "off"
already [1], and in particular that can be done in the case of unused
power resources.
Accordingly, modify acpi_turn_off_unused_power_resources() to
evaluate the _OFF method for each of the unused power resources
unconditionally which may help to work around BIOS issues where the
return value of _STA for a power resource does not reflect the
actual state of the power resource [2].
Link: https://uefi.org/specs/ACPI/6.4/07_Power_and_Performance_Mgmt/declaring-a-power-resource-object.html#off # [1]
Link: https://lore.kernel.org/lkml/20210314000439.3138941-1-luzmaximilian@gmail.com/ # [2]
Tested-by: Wendy Wang <wendy.wang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/acpi/power.c | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 46c38627adddb..bacae6d178ff5 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -1005,18 +1005,9 @@ void acpi_turn_off_unused_power_resources(void)
mutex_lock(&power_resource_list_lock);
list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) {
- int result, state;
-
mutex_lock(&resource->resource_lock);
- result = acpi_power_get_state(resource->device.handle, &state);
- if (result) {
- mutex_unlock(&resource->resource_lock);
- continue;
- }
-
- if (state == ACPI_POWER_RESOURCE_STATE_ON
- && !resource->ref_count) {
+ if (!resource->ref_count) {
dev_info(&resource->device.dev, "Turning OFF\n");
__acpi_power_off(resource);
}
--
cgit 1.2.3-1.el7
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