linux-kernel - Re: [PATCH 1/2] iio: st_sensors: Retry ID verification on failure

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Message-ID: <CAHp75VeJtorTzV-dmxgJz+UD4gTWY1v67U0iU5nZ1pR36W9tMg@mail.gmail.com>
Date:   Mon, 25 Jul 2022 23:20:55 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Matti Lehtimäki <matti.lehtimaki@...il.com>
Cc:     linux-iio <linux-iio@...r.kernel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandru Ardelean <aardelean@...iqon.com>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] iio: st_sensors: Retry ID verification on failure

On Sun, Jul 24, 2022 at 6:54 PM Matti Lehtimäki
<matti.lehtimaki@...il.com> wrote:
>
> Some sensors do not always start fast enough to read a valid ID from
> registers at first attempt. Let's retry at most 3 times with short sleep
> in between to fix random timing issues.

...

> +               for (i = 0; i < VERIFY_ID_RETRY_COUNT; i++) {
> +                       err = regmap_read(sdata->regmap,
> +                                         sdata->sensor_settings->wai_addr, &wai);
> +
> +                       if (!err && sdata->sensor_settings->wai == wai)
> +                               return 0;
> +
> +                       msleep(20);

NIH regmap_read_poll_timeout()


> +               }

-- 
With Best Regards,
Andy Shevchenko