linux-kernel - Re: [PATCH v2] iio: sx9310: Prefer async probe

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Message-ID: <159897502625.334488.7103007623601336114@swboyd.mtv.corp.google.com>
Date:   Tue, 01 Sep 2020 08:43:46 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Daniel Campello <campello@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: sx9310: Prefer async probe

Quoting Douglas Anderson (2020-09-01 08:19:43)
> On one board I found that:
>   probe of 5-0028 returned 1 after 259547 usecs
> 
> While some of this time is attributable to the pile of i2c transfers
> that we do at probe time, the lion's share (over 200 ms) is sitting
> waiting in the polling loop in sx9310_init_compensation() waiting for
> the hardware to indicate that it's done.
> 
> There's no reason to block probe of all other devices on our probe.
> Turn on async probe.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>