Patch "ACPI / PM: Runtime resume devices when waking from hibernate" has been added to the 4.5-stable tree

Patch "ACPI / PM: Runtime resume devices when waking from hibernate" has been added to the 4.5-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ACPI / PM: Runtime resume devices when waking from hibernate

to the 4.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     acpi-pm-runtime-resume-devices-when-waking-from-hibernate.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From fbda4b38fa3995aa0777fe9cbbdcb223c6292083 Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@wunner.de>
Date: Wed, 23 Mar 2016 00:11:20 +0100
Subject: ACPI / PM: Runtime resume devices when waking from hibernate

From: Lukas Wunner <lukas@wunner.de>

commit fbda4b38fa3995aa0777fe9cbbdcb223c6292083 upstream.

Commit 58a1fbbb2ee8 ("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: 58a1fbbb2ee8 (PM / PCI / ACPI: Kick devices that might have been reset by firmware)
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/acpi/sleep.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -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.


Patches currently in stable-queue which might be from lukas@wunner.de are

queue-4.5/acpi-pm-runtime-resume-devices-when-waking-from-hibernate.patch