linux-kernel - Re: [PATCH v7 0/5] This is the 1st version of suspend for RK3288.

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Date:	Mon, 10 Nov 2014 21:47:35 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Heiko Stübner <heiko@...ech.de>
Cc:	Chris Zhong <zyw@...k-chips.com>,
	Kevin Hilman <khilman@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Russell King <linux@....linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Tony Xie <xxx@...k-chips.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v7 0/5] This is the 1st version of suspend for RK3288.

Hi,

On Mon, Nov 10, 2014 at 4:40 PM, Heiko Stübner <heiko@...ech.de> wrote:
> Hi Chris,
>
> Am Freitag, 7. November 2014, 14:48:20 schrieb Kevin Hilman:
>> Chris Zhong <zyw@...k-chips.com> writes:
>> > RK3288 can shut down the cpu, gpu and other device controllers in suspend,
>> > and it will pull the GLOBAL_PWROFF pin to high in the final stage of the
>> > process of suspend, pull the pin to low again when resume.
>>
>> The cover letter still doesn't state what this series applies to, or
>> what its dependencies are for testing, even though it was requested in
>> earlier reviews[1].  I discovered (again) by trial and error it applies
>> to current linux-next.  I also discovered (as was earlier discussed[2])
>> that it still does not resume using current upstream code, and those
>> dependencies are not described here either.  These are the kinds of
>> things that are crucial in a cover letter in order to help reviewers and
>> testers not have to spend time digging through the archives trying to
>> remember from the previous round of reviews.
>>
>> Please, please list the out-of-tree dependencies, and how to test,
>> including how you tested it, and on what hardware.
>
> I'll second what Kevin said.
>
> I guess the regulator suspend handling [0] is one of the requirements, but I'd
> think there is more. And while Doug had a quite long list of suspend-related
> patches in his try, for now we'll need the minimal set to enable this series
> to sucessfully wake the system again after going to suspend.

With the current series we have in the Chrome OS tree, the WIP power
domain patches are a requirement, which makes testing very hard.  I've
suggested that Chris try going back to leaving the GPU on his patches.
It's possible you could get basic suspend/resume without power domain
patches in that case.  Once power domain stuff is in good shape then
we can turn off the GPU, I think.

...all of those things are needed to actually get the system into the
lowest power state, but starting simple makes a lot of sense.

-Doug
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