linux-kernel - Re: [PATCH 2/2] pinctrl: cherryview: Save and restore pin configs over system sleep

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Message-ID: <CACRpkdZnZ_Oz5MsC2XxTwOL=FLY-dA5xNN_tOH5COeNEsLix6Q@mail.gmail.com>
Date:	Fri, 9 Jan 2015 10:45:04 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] pinctrl: cherryview: Save and restore pin configs
 over system sleep

On Thu, Dec 4, 2014 at 11:32 AM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:

> Before resuming from system sleep BIOS restores its view of pin
> configuration. If we have configured some pins differently from that, for
> instance some driver requested a pin as a GPIO but it was not in GPIO mode
> originally, our view of the pin configuration will not match the hardware
> state anymore.
>
> This patch saves the pin configuration and interrupt mask registers on
> suspend and restores them on exit. This should make sure that the
> previously configured state is still in effect.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Patch applied for 3.20.

Yours,
Linus Walleij
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