Commit fbda4b38 authored Mar 23, 2016 by Lukas Wunner Committed by Rafael J. Wysocki Mar 23, 2016

ACPI / PM: Runtime resume devices when waking from hibernate

Commit 58a1fbbb ("PM / PCI / ACPI: Kick devices that might have been
reset by firmware") added a runtime resume for devices that were runtime
suspended when the system entered suspend-to-RAM.

Briefly, the motivation was to ensure that devices did not remain in a
reset-power-on state after resume, potentially preventing deep SoC-wide
low-power states from being entered on idle.

Currently we're not doing the same when leaving suspend-to-disk and this
asymmetry is a problem if drivers rely on the automatic resume triggered
by pm_complete_with_resume_check(). Fix it.

Fixes: 58a1fbbb (PM / PCI / ACPI: Kick devices that might have been reset by firmware)
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: 4.4+ <stable@vger.kernel.org> # 4.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 27614273

drivers/acpi/sleep.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -714,6 +714,7 @@ static int acpi_hibernation_enter(void)

		static void acpi_hibernation_leave(void)
		{
		pm_set_resume_via_firmware();
		/*
		* If ACPI is not enabled by the BIOS and the boot kernel, we need to
		* enable it here.

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