On Thu, Dec 7, 2017 at 3:27 AM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> Currently, non-wakeup GPEs are disabled on suspend-to-idle
> entry to avoid spurious wakeups, but that should not be strictly
> necessary any more after commit 33e4f80ee69b (ACPI / PM: Ignore
> spurious SCI wakeups from suspend-to-idle) which prevents spurious
> GPE wakeups from resuming the system. The only consequence of
> leaving non-wakeup GPEs enabled may be more interrupt-related
> activity while suspended, which is not ideal (more energy is
> used if that happens), but it is not critical too.
>
> On the other hand, this change allows Dells XPS13 9360 blacklisted by
> commit 71630b7a832f (ACPI / PM: Blacklist Low Power S0 Idle _DSM for
> Dell XPS13 9360) to use the power button for waking up from suspend-
> to-idle and it helps at least one other older Dell system (the
> wakeup button GPE on that one is not listed in _PRW for any
> devices, so it is not regarded as a wakeup one and gets disabled
> on suspend-to-idle entry today).
>
> For the above reasons, leave GPE configuration as is over
> suspend-to-idle on all systems.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> ---
> drivers/acpi/sleep.c | 11 +----------
> 1 file changed, 1 insertion(+), 10 deletions(-)
>
> Index: linux-pm/drivers/acpi/sleep.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/sleep.c
> +++ linux-pm/drivers/acpi/sleep.c
> @@ -951,15 +951,8 @@ static int acpi_s2idle_prepare(void)
> if (lps0_device_handle) {
> acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
> acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
> - } else {
> - /*
> - * The configuration of GPEs is changed here to avoid spurious
> - * wakeups, but that should not be necessary if this is a
> - * "low-power S0" platform and the low-power S0 _DSM is present.
> - */
> - acpi_enable_all_wakeup_gpes();
> - acpi_os_wait_events_complete();
> }
> +
> if (acpi_sci_irq_valid())
> enable_irq_wake(acpi_sci_irq);
>
> @@ -1005,8 +998,6 @@ static void acpi_s2idle_restore(void)
> if (lps0_device_handle) {
> acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
> acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
> - } else {
> - acpi_enable_all_runtime_gpes();
> }
> }
>
I have to withdraw this as it leads to a regression on one of my test machines.
That is unexpected, so I need to investigate what's going on in there.
Thanks,
Rafael
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