linux-kernel - Re: [PATCH v2 2/2] ARM: EXYNOS: Call regulator core suspend prepare and finish functions

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Date:	Mon, 20 Oct 2014 10:36:58 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Kukjin Kim <kgene.kim@...sung.com>,
	Lee Jones <lee.jones@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chris Zhong <zyw@...k-chips.com>
Subject: Re: [PATCH v2 2/2] ARM: EXYNOS: Call regulator core suspend prepare
 and finish functions

Javier,

On Mon, Oct 20, 2014 at 9:58 AM, Javier Martinez Canillas
<javier.martinez@...labora.co.uk> wrote:
>> It turns out that regulator_suspend_finish() actually returns an error
>> code.  Could you print a warning if you see it?
>>
>
> Yes, I noticed this when looking at Chris patch for Rockchip but didn't re-spin
> because I'm not sure anymore if this is the right solution. I mean, if is
> correct to add the same calls on every platform or if the regulator suspend
> prepare and finish functions should be called from the suspend core instead.
>
> For example calling regulator_suspend_prepare() from platform_suspend_prepare()
> [0] will have the advantage of passing the correct suspend_state_t state instead
> of hard-coding PM_SUSPEND_MEM and will make the regulator suspend states to work
> on all platforms.

Yes.  If we can get this added to the core that would be better.

I guess I was just trying to follow the suggestion that was in the
regulator code:
http://lxr.free-electrons.com/source/drivers/regulator/core.c#L3699
that says "This will usually be called by machine suspend code prior
to supending."

-Doug
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