linux-kernel - Re: [PATCH 1/2] pinctrl: samsung: fix suspend/resume functionality

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Date:	Thu, 16 May 2013 16:55:28 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Prathyush K <prathyush.k@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] pinctrl: samsung: fix suspend/resume functionality

Tomasz,

On Thu, May 16, 2013 at 4:10 PM, Doug Anderson <dianders@...omium.org> wrote:
> If state of these registers isn't lost on those SoCs then running the
> save/restore shouldn't _hurt_ though, right?  If you can run the old
> GPIO code on one of those systems and do a suspend/resume you could
> check...

I think it's been too long of a day for me, too.

I just thought about this and realized that there is no "powerdown"
registers for the GPX banks on exynos5250.  ...and they don't lose
their state at sleep!  ...so maybe a reasonable thing to do would be
to skip save/restore in any case where there are no powerdown
registers?

You can see a printout in my case:

[  412.840000] gpx0 @ f004ac00 (con 0x30000110 => 0x30000110)
[  412.840000] gpx1 @ f004ac20 (con 0x1f10ff10 => 0x1f10ff10)
[  412.840000] gpx2 @ f004ac40 (con 0x1f000f0f => 0x1f000f0f)
[  412.840000] gpx3 @ f004ac60 (con 0x00f00f01 => 0x00f00f01)

-Doug
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