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Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode

From Geert Uytterhoeven <geert@linux-m68k.org>
Newsgroups linux.kernel
Subject Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode
Date 2017-02-21 17:30 +0100
Message-ID <tdlua-52u-29@gated-at.bofh.it> (permalink)
References <td2Uy-Zo-11@gated-at.bofh.it> <td2Uy-Zo-19@gated-at.bofh.it> <tdgb7-1jD-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Hi Sudeep,

On Tue, Feb 21, 2017 at 11:42 AM, Sudeep Holla <sudeep.holla@arm.com> wrote:
> On 20/02/17 20:33, Geert Uytterhoeven wrote:
>> Enable support for "shallow" suspend mode, also known as "Standby" or
>> "Power-On Suspend".
>>
>> As secondary CPU cores are taken offline, "shallow" suspend mode saves
>> slightly more power than "s2idle", but less than "deep" suspend mode.
>> However, unlike "deep" suspend mode, "shallow" suspend mode can be used
>> regardless of the presence of support for PSCI_SYSTEM_SUSPEND, which is
>> an optional API in PSCI v1.0.
>>
>> List the available system suspend modes:
>>
>>     $ cat /sys/power/mem_sleep
>>     s2idle shallow [deep]
>>
>> Suspend to "shallow" mode:
>>
>>     $ echo shallow > /sys/power/mem_sleep
>>     $ echo mem > /sys/power/state
>>
>
> I don't have the links to such previous attempts handy, but we have

Don't worry, I did read earlier discussions about implementing shallow mode.

> more elegant alternative options(suspend-to-idle) and any such attempts
> to hack around the PSCI will be NACKed.

"s2idle" does not power down secondary CPU cores, so this is an improvement.
"deep" may not support configured wake-up sources, which is a bug.

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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