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

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Message-ID: <CAMuHMdUsWTYrUO9JtCDA5J6iPcRJMMevk9XDfiup=NpJKAkMPA@mail.gmail.com>
Date:   Tue, 21 Feb 2017 19:23:42 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Sudeep Holla <sudeep.holla@....com>, Pavel Machek <pavel@....cz>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....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 3/6] drivers: firmware: psci: Implement shallow
 suspend mode

Hi Mark,

On Tue, Feb 21, 2017 at 7:18 PM, Mark Rutland <mark.rutland@....com> wrote:
>> On top of that, the Linux PM subsystem allows to configure wakeup by writing
>> "enabled" to a device's "wakeup" file in sysfs.  Or you can use ethtool for
>> Wake-on-LAN.
>
> Sure; userspace can always do something silly here.

Not that silly: you can wake up using these sources, but not necessarily from
all states.

> As I mentioned in my other reply, we could/should add an interface to
> allow userspace to determine if it has a guaranteed wakeup, which would
> allow us to do the right thing.

Right.

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