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ACPI / PM: Runtime resume devices when waking from hibernate

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Commit 58a1fbbb2e ("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: 58a1fbbb2e (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>
This commit is contained in:
Lukas Wunner 2016-03-23 00:11:20 +01:00 committed by Rafael J. Wysocki
parent 276142730c
commit fbda4b38fa
1 changed files with 1 additions and 0 deletions
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drivers/acpi/sleep.c
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@ -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.