Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power

From: Geert Uytterhoeven
Date: Tue Feb 21 2017 - 11:37:29 EST

Hi Pavel,

On Tue, Feb 21, 2017 at 12:07 PM, Pavel Machek <pavel@xxxxxx> 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.



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

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