linux-kernel - Re: [PATCH] i2c: enable async suspend/resume on i2c devices

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Message-ID: <1c3aba3d-0dfb-dc24-bd7a-5289a19a9065@redhat.com>
Date:   Fri, 27 Jul 2018 14:07:11 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Derek Basehore <dbasehore@...omium.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Dmitry Torokhov <dtor@...omium.org>,
        venkateswarlu.v.vinjamuri@...el.corp-partner.google.com
Subject: Re: [PATCH] i2c: enable async suspend/resume on i2c devices

Hi,

On 07/27/2018 12:44 PM, Andy Shevchenko wrote:
> On Fri, Jul 27, 2018 at 1:55 AM, Derek Basehore <dbasehore@...omium.org> wrote:
>> This enables the async suspend property for i2c devices. This reduces
>> the suspend/resume time considerably on platforms with multiple i2c
>> devices (such as a trackpad or touchscreen).
> 
> How did you test this?
> 
> Especially on Chromebooks based on Intel Cherrytrail / Braswell
> platforms, they have a painful PMIC vs. OS design solution.
> 
> +Cc: Hans, who did a lot in this area.

We disable suspend of the i2c controller for the i2c-bus
to which the PMIc is connected on these platforms, so I do not
expect this to cause any new issues.

But this is something to keep an eye on,

Regards,

Hans