linux-kernel - Re: [PATCH] ACPI: PM: s2idle: Invoke

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Date:   Mon, 19 Apr 2021 20:17:20 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        "open list:ACPI" <linux-acpi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPI: PM: s2idle: Invoke _PTS for s2idle

On Mon, Apr 19, 2021 at 7:35 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
>
> On Mon, Apr 19, 2021 at 11:08 AM Kai-Heng Feng
> <kai.heng.feng@...onical.com> wrote:
> >
> > HP EliteBook 840 G8 reboots on s2idle resume, and HP EliteBook 845 G8
> > wakes up immediately on s2idle. Both are caused by the XMM7360 WWAN PCI
> > card.
> >
> > There's a WWAN specific method to really turn off the WWAN via EC:
> >     Method (_PTS, 1, NotSerialized)  // _PTS: Prepare To Sleep
> >     {
> >     ...
> >         If (CondRefOf (\_SB.PCI0.GP12.PTS))
> >         {
> >             \_SB.PCI0.GP12.PTS (Arg0)
> >         }
> >     ...
> >     }
> >
> >     Scope (_SB.PCI0.GP12)
> >     {
> >     ...
> >         Method (PTS, 1, Serialized)
> >         {
> >             If (^^LPCB.EC0.ECRG)
> >             {
> >                 If ((PDID == 0xFFFF))
> >                 {
> >                     Return (Zero)
> >                 }
> >
> >                 POFF ()
> >                 SGIO (WWBR, One)
> >                 Sleep (0x1E)
> >                 Acquire (^^LPCB.EC0.ECMX, 0xFFFF)
> >                 ^^LPCB.EC0.WWP = One
> >                 Release (^^LPCB.EC0.ECMX)
> >                 Sleep (0x01F4)
> >             }
> >
> >             Return (Zero)
> >         }
> >     ...
> >     }
> >
> > So let's also invok _PTS for s2idle.
> >
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> > ---
> >  drivers/acpi/sleep.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
> > index 09fd13757b65..7e84b4b09919 100644
> > --- a/drivers/acpi/sleep.c
> > +++ b/drivers/acpi/sleep.c
> > @@ -698,6 +698,7 @@ int acpi_s2idle_prepare(void)
> >         }
> >
> >         acpi_enable_wakeup_devices(ACPI_STATE_S0);
> > +       acpi_enter_sleep_state_prep(ACPI_STATE_S0);
>
> The system is in S0 already at this point, so not really.

Ok, indeed ACPI spec only states _PTS can be used for S1 to S5.

> Please use a quirk to address this.

Let me discuss with HP folks. Right now it looks like we need to apply
this to all HP systems...

Kai-Heng

>
> >
> >         /* Change the configuration of GPEs to avoid spurious wakeup. */
> >         acpi_enable_all_wakeup_gpes();
> > --