On Mon, May 18, 2020 at 1:11 PM Chris Chiu <chiu@xxxxxxxxxxxx> wrote: > > On Mon, May 18, 2020 at 4:59 PM Rafael J. Wysocki <rafael@xxxxxxxxxx> wrote: > > > > On Thu, May 14, 2020 at 12:10 PM Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote: > > > > > > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > > > > > Flushing the EC work while suspended to idle when the EC GPE status > > > is not set causes some EC wakeup events (notably power button and > > > lid ones) to be missed after a series of spurious wakeups on the Dell > > > XPS13 9360 in my office. > > > > > > If that happens, the machine cannot be woken up from suspend-to-idle > > > by a power button press or lid status change and it needs to be woken > > > up in some other way (eg. by a key press). > > > > > > Flushing the EC work only after successful dispatching the EC GPE, > > > which means that its status has been set, avoids the issue, so change > > > the code in question accordingly. > > > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > > --- > > > > > > Hi Chris, > > > > > > Please check if the key press wakeup still works on your system with this patch > > > applied (on top of https://patchwork.kernel.org/patch/11538065/). > > > > Hi Chris, > > > > Since I haven't heard back from you and the problem at hand is a > > regression on the machine where it happens, I'm going to push this > > patch for merging. > > > > If it causes the key press wakeup issue to reappear on your machine, > > I'm afraid that we'll need to quirk it in the EC driver. > > > > Thanks! > > Hi Rafael, > My laptop works w/o problem waking up from a keystroke with this patch > on top of https://patchwork.kernel.org/patch/11538065/). Great, thanks for the confirmation! > > > --- > > > drivers/acpi/ec.c | 6 +++++- > > > drivers/acpi/sleep.c | 15 ++++----------- > > > 2 files changed, 9 insertions(+), 12 deletions(-) > > > > > > Index: linux-pm/drivers/acpi/ec.c > > > =================================================================== > > > --- linux-pm.orig/drivers/acpi/ec.c > > > +++ linux-pm/drivers/acpi/ec.c > > > @@ -2020,9 +2020,13 @@ bool acpi_ec_dispatch_gpe(void) > > > * to allow the caller to process events properly after that. > > > */ > > > ret = acpi_dispatch_gpe(NULL, first_ec->gpe); > > > - if (ret == ACPI_INTERRUPT_HANDLED) > > > + if (ret == ACPI_INTERRUPT_HANDLED) { > > > pm_pr_dbg("EC GPE dispatched\n"); > > > > > > + /* Flush the event and query workqueues. */ > > > + acpi_ec_flush_work(); > > > + } > > > + > > > return false; > > > } > > > #endif /* CONFIG_PM_SLEEP */ > > > Index: linux-pm/drivers/acpi/sleep.c > > > =================================================================== > > > --- linux-pm.orig/drivers/acpi/sleep.c > > > +++ linux-pm/drivers/acpi/sleep.c > > > @@ -980,13 +980,6 @@ static int acpi_s2idle_prepare_late(void > > > return 0; > > > } > > > > > > -static void acpi_s2idle_sync(void) > > > -{ > > > - /* The EC driver uses special workqueues that need to be flushed. */ > > > - acpi_ec_flush_work(); > > > - acpi_os_wait_events_complete(); /* synchronize Notify handling */ > > > -} > > > - > > > static bool acpi_s2idle_wake(void) > > > { > > > if (!acpi_sci_irq_valid()) > > > @@ -1018,7 +1011,7 @@ static bool acpi_s2idle_wake(void) > > > return true; > > > > > > /* > > > - * Cancel the wakeup and process all pending events in case > > > + * Cancel the SCI wakeup and process all pending events in case > > > * there are any wakeup ones in there. > > > * > > > * Note that if any non-EC GPEs are active at this point, the > > > @@ -1026,8 +1019,7 @@ static bool acpi_s2idle_wake(void) > > > * should be missed by canceling the wakeup here. > > > */ > > > pm_system_cancel_wakeup(); > > > - > > > - acpi_s2idle_sync(); > > > + acpi_os_wait_events_complete(); > > > > > > /* > > > * The SCI is in the "suspended" state now and it cannot produce > > > @@ -1060,7 +1052,8 @@ static void acpi_s2idle_restore(void) > > > * of GPEs. > > > */ > > > acpi_os_wait_events_complete(); /* synchronize GPE processing */ > > > - acpi_s2idle_sync(); > > > + acpi_ec_flush_work(); /* flush the EC driver's workqueues */ > > > + acpi_os_wait_events_complete(); /* synchronize Notify handling */ > > > > > > s2idle_wakeup = false; > > > > > > > > > > > >
