From c40061dab6b1ec4d781de697c4c23e82c8c10d73 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Sat, 9 Oct 2021 16:22:09 +0200
Subject: [PATCH] ACPI: scan: Release PM resources blocked by unused objects
Git-commit: c10383e8ddf4810b9a5c1595404c2724d925a0a6
Patch-mainline: v5.16-rc1
References: stable-5.14.19
[ Upstream commit c10383e8ddf4810b9a5c1595404c2724d925a0a6 ]
On some systems the ACPI namespace contains device objects that are
not used in certain configurations of the system. If they start off
in the D0 power state configuration, they will stay in it until the
system reboots, because of the lack of any mechanism possibly causing
their configuration to change. If that happens, they may prevent
some power resources from being turned off or generally they may
prevent the platform from getting into the deepest low-power states
thus causing some energy to be wasted.
Address this issue by changing the configuration of unused ACPI
device objects to the D3cold power state one after carrying out
the ACPI-based enumeration of devices.
Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=214091
Link: https://lore.kernel.org/linux-acpi/20211007205126.11769-1-mario.limonciello@amd.com/
Reported-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/acpi/glue.c | 25 +++++++++++++++++++++++++
drivers/acpi/internal.h | 1 +
drivers/acpi/scan.c | 6 ++++++
3 files changed, 32 insertions(+)
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -350,3 +350,28 @@ void acpi_device_notify_remove(struct de
acpi_unbind_one(dev);
}
+
+int acpi_dev_turn_off_if_unused(struct device *dev, void *not_used)
+{
+ struct acpi_device *adev = to_acpi_device(dev);
+
+ /*
+ * Skip device objects with device IDs, because they may be in use even
+ * if they are not companions of any physical device objects.
+ */
+ if (adev->pnp.type.hardware_id)
+ return 0;
+
+ mutex_lock(&adev->physical_node_lock);
+
+ /*
+ * Device objects without device IDs are not in use if they have no
+ * corresponding physical device objects.
+ */
+ if (list_empty(&adev->physical_node_list))
+ acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
+
+ mutex_unlock(&adev->physical_node_lock);
+
+ return 0;
+}
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -117,6 +117,7 @@ bool acpi_device_is_battery(struct acpi_
bool acpi_device_is_first_physical_node(struct acpi_device *adev,
const struct device *dev);
int acpi_bus_register_early_device(int type);
+int acpi_dev_turn_off_if_unused(struct device *dev, void *not_used);
/* --------------------------------------------------------------------------
Device Matching and Notification
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -2559,6 +2559,12 @@ int __init acpi_scan_init(void)
}
}
+ /*
+ * Make sure that power management resources are not blocked by ACPI
+ * device objects with no users.
+ */
+ bus_for_each_dev(&acpi_bus_type, NULL, NULL, acpi_dev_turn_off_if_unused);
+
acpi_turn_off_unused_power_resources();
acpi_scan_initialized = true;