linux-kernel - Re: System fails to exit s2idle by a keystroke on my laptop

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Date:   Thu, 07 May 2020 20:05:11 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Chris Chiu <chiu@...lessm.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Seth Forshee <seth.forshee@...onical.com>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: System fails to exit s2idle by a keystroke on my laptop

On Thursday, May 7, 2020 5:38:11 AM CEST Chris Chiu wrote:
> On Wed, May 6, 2020 at 6:19 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> >
> > On Wed, May 6, 2020 at 11:32 AM Rafael J. Wysocki <rafael@...nel.org> wrote:
> > >
> > >
> > > Thanks for the report, the issue evidently is EC-related.
> > >
> > > > @@ -1024,7 +1024,7 @@ static bool acpi_s2idle_wake(void)
> > > >                  * regarded as a spurious one.
> > > >                  */
> > > >                 if (!acpi_ec_dispatch_gpe())
> > > > -                       return false;
> > > > +                       return true;
> > >
> > > Have you tried commenting out simply removing the if () check and the
> > > following return statement?
> >
> > Scratch that.
> >
> > Instead, please try doing
> >
> > acpi_ec_dispatch_gpe()
> >
> > instead of the if () and the following return statement.
> 
> Yes. I verified with the modification you suggested on my laptop. It's
> working OK.
> I can wake from a keystroke w/o problem.
> 
> @ -1024,8 +1024,7 @@ static bool acpi_s2idle_wake(void)
>                  * If the EC GPE status bit has not been set, the wakeup is
>                  * regarded as a spurious one.
>                  */
> -               if (!acpi_ec_dispatch_gpe())
> -                       return false;
> +               acpi_ec_dispatch_gpe();
> 
>                 /*
>                  * Cancel the wakeup and process all pending events in case
> 

OK, great, thanks for the confirmation!

Does the appended patch work for you then?

It should be functionally equivalent to the above change if I didn't mess it up.


---
 drivers/acpi/ec.c       |   23 ++++++++++++++---------
 drivers/acpi/internal.h |    1 -
 drivers/acpi/sleep.c    |   14 ++------------
 3 files changed, 16 insertions(+), 22 deletions(-)

Index: linux-pm/drivers/acpi/sleep.c
===================================================================
--- linux-pm.orig/drivers/acpi/sleep.c
+++ linux-pm/drivers/acpi/sleep.c
@@ -1013,21 +1013,11 @@ static bool acpi_s2idle_wake(void)
 		if (acpi_check_wakeup_handlers())
 			return true;
 
-		/*
-		 * If the status bit is set for any enabled GPE other than the
-		 * EC one, the wakeup is regarded as a genuine one.
-		 */
-		if (acpi_ec_other_gpes_active())
+		/* Check non-EC GPE wakeups and dispatch the EC GPE. */
+		if (acpi_ec_dispatch_gpe())
 			return true;
 
 		/*
-		 * If the EC GPE status bit has not been set, the wakeup is
-		 * regarded as a spurious one.
-		 */
-		if (!acpi_ec_dispatch_gpe())
-			return false;
-
-		/*
 		 * Cancel the wakeup and process all pending events in case
 		 * there are any wakeup ones in there.
 		 *
Index: linux-pm/drivers/acpi/ec.c
===================================================================
--- linux-pm.orig/drivers/acpi/ec.c
+++ linux-pm/drivers/acpi/ec.c
@@ -1994,23 +1994,28 @@ void acpi_ec_set_gpe_wake_mask(u8 action
 		acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action);
 }
 
-bool acpi_ec_other_gpes_active(void)
-{
-	return acpi_any_gpe_status_set(first_ec ? first_ec->gpe : U32_MAX);
-}
-
 bool acpi_ec_dispatch_gpe(void)
 {
 	u32 ret;
 
 	if (!first_ec)
-		return false;
+		return acpi_any_gpe_status_set(U32_MAX);
 
+	/*
+	 * Report wakeup if the status bit is set for any enabled GPE other
+	 * than the EC one.
+	 */
+	if (acpi_any_gpe_status_set(first_ec->gpe))
+		return true;
+
+	/*
+	 * Dispatch the EC GPE in-band, but do not report wakeup in any case
+	 * 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");
-		return true;
-	}
+
 	return false;
 }
 #endif /* CONFIG_PM_SLEEP */
Index: linux-pm/drivers/acpi/internal.h
===================================================================
--- linux-pm.orig/drivers/acpi/internal.h
+++ linux-pm/drivers/acpi/internal.h
@@ -202,7 +202,6 @@ void acpi_ec_remove_query_handler(struct
 
 #ifdef CONFIG_PM_SLEEP
 void acpi_ec_flush_work(void);
-bool acpi_ec_other_gpes_active(void);
 bool acpi_ec_dispatch_gpe(void);
 #endif