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Groups > linux.kernel > #1586134
| From | Geert Uytterhoeven <geert@linux-m68k.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power |
| Date | 2017-02-22 14:20 +0100 |
| Message-ID | <tdEZP-2cZ-1@gated-at.bofh.it> (permalink) |
| References | <td2Uy-Zo-11@gated-at.bofh.it> <tdnvZ-6me-35@gated-at.bofh.it> <tdnFE-6qe-21@gated-at.bofh.it> <tdtUK-2he-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Hi Rafael,
On Wed, Feb 22, 2017 at 2:14 AM, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
> On Tuesday, February 21, 2017 06:45:13 PM Sudeep Holla wrote:
>> On 21/02/17 18:27, Sudeep Holla wrote:
>> > On 21/02/17 17:51, Sudeep Holla wrote:
>> >> On 21/02/17 17:34, Geert Uytterhoeven wrote:
>> >>> That's more or less what /sys/power/mem_sleep does, though.
>> >>
>> >> OK, I will go through that in detail.
>> >
>> > OK, I went through the patch and the main intention is was added.
>> > So I will begin by summarizing my understanding:
>> >
>> > A new suspend interface(/sys/power/mem_sleep) is added to allow the
>> > "mem" string in /sys/power/state to represent multiple things that can
>> > be selected.
>> >
>> > Before:
>> > A. echo freeze > /sys/power/state ---> Enters s2idle
>> > B. echo mem > /sys/power/state ---> Enters s2r(a.k.a now deep mem sleep)
>> >
>> > After:
>> > 1. echo freeze > /sys/power/state ---> Enters s2idle still same
>> > 2. echo s2idle > /sys/power/mem_sleep
>> > echo mem > /sys/power/state ---> Also enter s2idle
>> > 3. echo deep > /sys/power/mem_sleep
>> > echo mem > /sys/power/state ---> Also enter s2r(same as [B] above)
>> >
>> > Please note I have carefully dropped standby/shallow as we will not
>> > support that state on ARM64 platforms(refer previous discussions for the
>> > same)
>> >
>> > Now IIUC, you need 2 above. So, since this new interface allow mem to
>> > mean "s2idle", we need to fix the core to register default suspend_ops
>> > to achieve what you need.
>>
>> I take this back, you have everything you need in place, nothing needs
>> to be done. I just checked again. If I don't register PSCI suspend_ops,
>> I still get mem in /sys/power/state with s2idle in /sys/power/mem_sleep
>> which is exactly what we need. Again we don't support standby/shallow
>> state on ARM64/PSCI.
>
> Except for one thing which may or may not be a concern here.
>
> Suspend to idle should only go into states in which all of the available wakeup
> devices work. If there are devices that cannot wake you up from a given state,
> this isn't "idle" any more, is it?
Indeed. And I have no problem with handling wake-up sources from Linux,
as Linux knows how to handle them.
> As for the device wakeup disable/enable interface, it is for controlling
> whether or not a given device should be allowed to generate wakeup signals at
> all.
OK. So it's not guaranteed that it will actually work...
> The information on what states a given device can wake up the system from is
> platform-specific and generally would need to be taken into consideration at
> the platform level.
So that's PSCI on arm64?
But the PSCI specification doesn't handle that.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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[PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert+renesas@glider.be> - 2017-02-20 21:40 +0100
[PATCH/RFC 2/6] PM / Wakeup: Add wakeup_source_available() Geert Uytterhoeven <geert+renesas@glider.be> - 2017-02-20 21:40 +0100
[PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Geert Uytterhoeven <geert+renesas@glider.be> - 2017-02-20 21:40 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 11:50 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-21 17:30 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 18:00 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Pavel Machek <pavel@ucw.cz> - 2017-02-21 12:10 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 12:20 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-21 17:40 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 18:30 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-22 14:50 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Sudeep Holla <sudeep.holla@arm.com> - 2017-02-22 15:40 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Mark Rutland <mark.rutland@arm.com> - 2017-02-21 18:30 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-21 19:10 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Mark Rutland <mark.rutland@arm.com> - 2017-02-21 19:20 +0100
Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-21 19:30 +0100
[PATCH/RFC 1/6] alarmtimer: Postpone wake-up source registration until really available Geert Uytterhoeven <geert+renesas@glider.be> - 2017-02-20 21:40 +0100
[PATCH/RFC 6/6] arm64: dts: r8a7796: Fix non-PMIC wake-up sources Geert Uytterhoeven <geert+renesas@glider.be> - 2017-02-20 21:40 +0100
[PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert+renesas@glider.be> - 2017-02-20 21:40 +0100
Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 12:00 +0100
Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-21 17:40 +0100
Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 17:50 +0100
Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Pavel Machek <pavel@ucw.cz> - 2017-02-21 12:10 +0100
Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-21 17:40 +0100
Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Mark Rutland <mark.rutland@arm.com> - 2017-02-21 19:00 +0100
Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Mark Rutland <mark.rutland@arm.com> - 2017-02-21 18:50 +0100
Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-22 15:10 +0100
Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power "Rafael J. Wysocki" <rafael@kernel.org> - 2017-02-22 16:00 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 11:40 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-21 17:30 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 17:50 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-21 18:40 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 19:00 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 19:40 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-21 19:50 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-22 02:30 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-22 12:10 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-22 14:40 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-22 15:40 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power "Rafael J. Wysocki" <rafael@kernel.org> - 2017-02-22 16:00 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-22 17:00 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-23 16:30 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-23 16:40 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-23 17:00 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla <sudeep.holla@arm.com> - 2017-02-23 17:00 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-22 14:20 +0100
Re: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power "Rafael J. Wysocki" <rafael@kernel.org> - 2017-02-22 15:40 +0100
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