| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.5 219/238] ACPI / PM: Runtime resume devices when waking from hibernate | Date | Sun, 10 Apr 2016 11:36:36 -0700 |
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4.5-stable review patch. If anyone has any objections, please let me know.
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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.
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