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Message-ID: <574429C7.3050101@redhat.com> Date: Tue, 24 May 2016 06:15:35 -0400 From: Prarit Bhargava <prarit@...hat.com> To: Ocean HY1 He <hehy1@...ovo.com>, "jcm@...hat.com" <jcm@...hat.com> CC: "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, David Tanaka <dtanaka@...ovo.com>, Nagananda Chumbalkar <nchumbalkar@...ovo.com>, "rjw@...ysocki.net" <rjw@...ysocki.net>, "lenb@...nel.org" <lenb@...nel.org>, "wefu@...hat.com" <wefu@...hat.com> Subject: Re: [PATCH] ACPI: Execute the _PTS method when system reboot On 05/24/2016 02:41 AM, Ocean HY1 He wrote: > Hi Prarit and Jon, > > How do you think of this? > > Thanks. > > Ocean He / 何海洋 > SW Development Dept. > Beijing Design Center > Enterprise Product Group > Mobile: 18911778926 > E-mail: hehy1@...ovo.com > No.6 Chuang Ye Road, Haidian District, Beijing, China 100085 > > -----Original Message----- > From: Ocean HY1 He > Sent: Monday, May 16, 2016 11:04 AM > To: rjw@...ysocki.net; lenb@...nel.org > Cc: linux-acpi@...r.kernel.org; linux-kernel@...r.kernel.org; David Tanaka; Nagananda Chumbalkar > Subject: RE: [PATCH] ACPI: Execute the _PTS method when system reboot > > To whom may concern, > > A Lenovo feature depends on _PTS method execution when reboot. And after check the ACPI spec, I think _PTS should be exectued when reboo. This patch could fix the problem. > > Any comments of this patch? Many thanks! > > Ocean He / 何海洋 > SW Development Dept. > Beijing Design Center > Enterprise Product Group > Mobile: 18911778926 > E-mail: hehy1@...ovo.com > No.6 Chuang Ye Road, Haidian District, Beijing, China 100085 > > -----Original Message----- > From: Ocean HY1 He > Sent: Monday, May 09, 2016 1:50 PM > To: rjw@...ysocki.net; lenb@...nel.org > Cc: linux-acpi@...r.kernel.org; linux-kernel@...r.kernel.org; David Tanaka; Ocean HY1 He; Nagananda Chumbalkar > Subject: [PATCH] ACPI: Execute the _PTS method when system reboot > > The _PTS control method is defined in the section 7.4.1 of acpi 6.0 > spec. The _PTS control method is executed by the OS during the sleep > transition process for S1, S2, S3, S4, and for orderly S5 shutdown. > The sleeping state value (For example, 1, 2, 3, 4 or 5 for the S5 > soft-off state) is passed to the _PTS control method. This method > is called after OSPM has notified native device drivers of the sleep > state transition and before the OSPM has had a chance to fully > prepare the system for a sleep state transition. > > The _PTS control method provides the BIOS a mechanism for performing > some housekeeping, such as writing the sleep type value to the embedded > controller, before entering the system sleeping state. > > According to section 7.5 of acpi 6.0 spec, _PTS should run after _TTS. > > Thus, a _PTS block notifier is added to the reboot notifier list so that > the _PTS object will also be evaluated when the system reboot. > > Signed-off-by: Ocean He <hehy1@...ovo.com> > Signed-off-by: Nagananda Chumbalkar <nchumbalkar@...ovo.com> > --- > drivers/acpi/sleep.c | 27 +++++++++++++++++++++++++++ > 1 file changed, 27 insertions(+) > > diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c > index 2a8b596..8b290fb 100644 > --- a/drivers/acpi/sleep.c > +++ b/drivers/acpi/sleep.c > @@ -55,6 +55,26 @@ static struct notifier_block tts_notifier = { > .priority = 0, > }; > > +static int pts_notify_reboot(struct notifier_block *this, > + unsigned long code, void *x) > +{ > + acpi_status status; > + > + status = acpi_execute_simple_method(NULL, "\\_PTS", ACPI_STATE_S5); > + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { > + /* It won't break anything. */ > + printk(KERN_NOTICE "Failure in evaluating _PTS object\n"); ^^^^ pr_debug("No _PTS object found.\n"); It isn't a warning or error, so don't put the word "Failure" in there. Beyond that, looks entirely reasonable to me. P. > + } > + > + return NOTIFY_DONE; > +} > + > +static struct notifier_block pts_notifier = { > + .notifier_call = pts_notify_reboot, > + .next = NULL, > + .priority = 0, > +}; > + > static int acpi_sleep_prepare(u32 acpi_state) > { > #ifdef CONFIG_ACPI_SLEEP > @@ -896,5 +916,12 @@ int __init acpi_sleep_init(void) > * object can also be evaluated when the system enters S5. > */ > register_reboot_notifier(&tts_notifier); > + > + /* > + * According to section 7.5 of acpi 6.0 spec, _PTS should run after > + * _TTS when the system enters S5. > + */ > + register_reboot_notifier(&pts_notifier); > + > return 0; > } >
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