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

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Date:   Sun, 25 Sep 2022 17:50:45 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>,
        Josef Bacik <josef@...icpanda.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        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 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.