linux-kernel - Re: [PATCH v4 2/2] PM: ACPI: reboot: Reinstate S5 for reboot

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Date:   Thu, 29 Sep 2022 14:03:18 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>,
        Josef Bacik <josef@...icpanda.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] PM: ACPI: reboot: Reinstate S5 for reboot

On Sun, Sep 25, 2022 at 11:50 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
>
> On Sat, Sep 24, 2022 at 6:19 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> >
> > On Fri, Sep 16, 2022 at 6:33 AM Kai-Heng Feng
> > <kai.heng.feng@...onical.com> wrote:
> > >
> > > Commit d60cd06331a3 ("PM: ACPI: reboot: Use S5 for reboot") caused Dell
> > > PowerEdge r440 hangs at reboot.
> > >
> > > The issue is fixed by commit 2ca1c94ce0b6 ("tg3: Disable tg3 device on
> > > system reboot to avoid triggering AER"), so use the new sysoff API to
> > > reinstate S5 for reboot on ACPI-based systems.
> > >
> > > Using S5 for reboot is default behavior under Windows, "A full shutdown
> > > (S5) occurs when a system restart is requested" [1].
> > >
> > > [1] https://docs.microsoft.com/en-us/windows/win32/power/system-power-state
> > >
> > > Cc: Josef Bacik <josef@...icpanda.com>
> > > Suggested-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> > > ---
> > > v4:
> > >  - Add comment and add more info to commit message.
> > > v3:
> > >  - Use new API to invoke ACPI S5.
> > > v2:
> > >  - Use do_kernel_power_off_prepare() instead.
> > >
> > >  drivers/acpi/sleep.c | 8 ++++++++
> > >  1 file changed, 8 insertions(+)
> > >
> > > diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
> > > index ad4b2987b3d6e..0b557c0d405ef 100644
> > > --- a/drivers/acpi/sleep.c
> > > +++ b/drivers/acpi/sleep.c
> > > @@ -1088,6 +1088,14 @@ int __init acpi_sleep_init(void)
> > >                 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
> > >                                          SYS_OFF_PRIO_FIRMWARE,
> > >                                          acpi_power_off, NULL);
> > > +
> > > +               /*
> > > +                * Windows uses S5 for reboot, so some BIOSes depend on it to
> > > +                * perform proper reboot.
> > > +                */
> > > +               register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
> > > +                                        SYS_OFF_PRIO_FIRMWARE,
> > > +                                        acpi_power_off_prepare, NULL);
> > >         } else {
> > >                 acpi_no_s5 = true;
> > >         }
> > > --
> >
> > Applied as 6.1 material with some edits in the changelog, thanks!
>
> And dropped due to a build failure.
>
> It looks like it depends on patch [1/2], but I haven't seen that one.

Sorry about that, let me resend it to linux-pm too.

Kai-Heng