On Wed, Jul 19, 2017 at 1:04 AM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > After commit 8110dd281e15 (ACPI / sleep: EC-based wakeup from > suspend-to-idle on recent systems) the configuration of GPEs, > including the EC one, is not changed during suspend-to-idle on > recent systems. That's in order to make system wakeup events > generated by the EC work, in particular. > > However, on some of the systems in question (for example on Dell > XPS13 9365), in addition to generating system wakeup events the > EC generates a heartbeat sequence of interrupts that have nothing > to do with wakeup while suspended, and the Low Power Idle S0 _DSM > interface doesn't change that behavior. > > The users of those systems may prefer to disable the EC GPE during > system suspend, for the cost of non-functional power button wakeup > or similar, but currently there is no way to do that. > > For this reason, add a new module parameter, ec_no_wakeup, for the > EC driver module that, if set, will cause the EC GPE to be disabled > during system suspend and re-enabled during the subsequent system > resume. > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=192591#c106 > Fixes: 8110dd281e15 (ACPI / sleep: EC-based wakeup from suspend-to-idle on recent systems) > Reported-and-tested-by: Patrik Kullman <patrik.kullman@xxxxxxxxx> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Any objections against this? If not, I will queue it up for 4.13. > --- > drivers/acpi/ec.c | 31 +++++++++++++++++++++++++++++++ > 1 file changed, 31 insertions(+) > > Index: linux-pm/drivers/acpi/ec.c > =================================================================== > --- linux-pm.orig/drivers/acpi/ec.c > +++ linux-pm/drivers/acpi/ec.c > @@ -151,6 +151,10 @@ static bool ec_freeze_events __read_most > module_param(ec_freeze_events, bool, 0644); > MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume"); > > +static bool ec_no_wakeup __read_mostly; > +module_param(ec_no_wakeup, bool, 0644); > +MODULE_PARM_DESC(ec_no_wakeup, "Do not wake up from suspend-to-idle"); > + > struct acpi_ec_query_handler { > struct list_head node; > acpi_ec_query_func func; > @@ -1880,6 +1884,32 @@ static int acpi_ec_suspend(struct device > return 0; > } > > +static int acpi_ec_suspend_noirq(struct device *dev) > +{ > + struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); > + > + /* > + * The SCI handler doesn't run at this point, so the GPE can be > + * masked at the low level without side effects. > + */ > + if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && > + ec->reference_count >= 1) > + acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); > + > + return 0; > +} > + > +static int acpi_ec_resume_noirq(struct device *dev) > +{ > + struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); > + > + if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && > + ec->reference_count >= 1) > + acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); > + > + return 0; > +} > + > static int acpi_ec_resume(struct device *dev) > { > struct acpi_ec *ec = > @@ -1891,6 +1921,7 @@ static int acpi_ec_resume(struct device > #endif > > static const struct dev_pm_ops acpi_ec_pm = { > + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq) > SET_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend, acpi_ec_resume) > }; > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
