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

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Date:   Tue, 21 Feb 2017 12:07:30 +0100
From:   Pavel Machek <pavel@....cz>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     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, linux-arm-kernel@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org, linux-pm@...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

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?)

								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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