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

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Message-ID: <CAGAzgso2Lf6Yw+5xGLkaTdJ7TAZ8_43qEpOya+zUjWqy4ET7RQ@mail.gmail.com>
Date:   Fri, 27 Jul 2018 09:17:12 -0700
From:   "dbasehore ." <dbasehore@...omium.org>
To:     hdegoede@...hat.com
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, wsa@...-dreams.de,
        linux-i2c@...r.kernel.org, Doug Anderson <dianders@...omium.org>,
        dtor@...omium.org,
        venkateswarlu.v.vinjamuri@...el.corp-partner.google.com
Subject: Re: [PATCH] i2c: enable async suspend/resume on i2c devices

On Fri, Jul 27, 2018 at 5:07 AM Hans de Goede <hdegoede@...hat.com> wrote:

> 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?
>

It was tested on Apollolake Chromebook devices.


> >
> > 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
>
>

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