linux-kernel - Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM

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Message-ID: <CAMuHMdX24ONBOovb26epZpKJV1w64NbEhr_Rex=NDPe4e0frmQ@mail.gmail.com>
Date:   Tue, 21 Feb 2017 17:36:38 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Lina Iyer <lina.iyer@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if
 SYSTEM_SUSPEND cuts power

Hi Pavel,

On Tue, Feb 21, 2017 at 12:07 PM, Pavel Machek <pavel@....cz> wrote:
> On Mon 2017-02-20 21:33:27, Geert Uytterhoeven wrote:
>> Nothing in the PSCI specification requires the SoC to remain powered and
>> to support wake-up sources when suspended using SYSTEM_SUSPEND.
>> If the firmware implements the PSCI SYSTEM_SUSPEND operation by cutting
>> power to the SoC, the only possibly wake-up sources are thus the ones
>> connected to the PMIC.
>>
>> Document and add support for an "arm,psci-system-suspend-is-power-down"
>> DT property, so Linux uses a different suspend method when other wake-up
>> sources (e.g. wake on LAN, UART or GPIO) are enabled.
>
> Should we make PSCI return that information? (At least in next
> specification version?)

That's a possible solution.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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