linux-kernel - [PATCH v1 8/9] ACPI: PM: Set/clear power.strict

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Message-ID: <1916173.atdPhlSkOF@rjwysocki.net>
Date: Wed, 25 Jun 2025 21:24:27 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Linux ACPI <linux-acpi@...r.kernel.org>,
 Linux PCI <linux-pci@...r.kernel.org>, Ulf Hansson <ulf.hansson@...aro.org>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject:
 [PATCH v1 8/9] ACPI: PM: Set/clear power.strict_midlayer during attach/detach

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The ACPI general PM domain does not expect its runtime PM callbacks,
acpi_subsys_runtime_suspend() and acpi_subsys_runtime_resume(), to
be invoked at any point during system-wide suspend and resume, so
make it express that expectation by setting power.strict_midlayer
for devices that it is attached to.  Also make it clear that flag
when it detaches from those devices.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

This depends on

https://lore.kernel.org/linux-acpi/4665476.LvFx2qVVIh@rjwysocki.net/

---
 drivers/acpi/device_pm.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -1404,6 +1404,7 @@
 	struct acpi_device *adev = ACPI_COMPANION(dev);

 	if (adev && dev->pm_domain == &acpi_general_pm_domain) {
+		dev_pm_strict_midlayer(dev, false);
 		dev_pm_domain_set(dev, NULL);
 		acpi_remove_pm_notifier(adev);
 		if (power_off) {
@@ -1463,6 +1464,7 @@

 	acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func);
 	dev_pm_domain_set(dev, &acpi_general_pm_domain);
+	dev_pm_strict_midlayer(dev, true);
 	if (power_on) {
 		acpi_dev_pm_full_power(adev);
 		acpi_device_wakeup_disable(adev);