linux-kernel - Re: [PATCH v5 2/2] iio: pressure: dps310: Reset chip if MEAS

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Message-ID: <CAHp75VegQspJJ9YT=2E3YvKh-hp9-AGincp4z0GdQbA0Vq4Zug@mail.gmail.com>
Date:   Thu, 18 Aug 2022 23:16:55 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Joel Stanley <joel@....id.au>
Subject: Re: [PATCH v5 2/2] iio: pressure: dps310: Reset chip if MEAS_CFG is corrupt

On Mon, Aug 15, 2022 at 5:57 PM Eddie James <eajames@...ux.ibm.com> wrote:
>
> Corruption of the MEAS_CFG register has been observed soon after
> system boot. In order to recover this scenario, check MEAS_CFG if
> measurement isn't ready, and if it's incorrect, reset the DPS310
> and execute the startup procedure.

...

> + * Called with lock held. Returns a negative value on error, a positive value
> + * when the device is not ready, and zero when the device is ready.

Can we have

#define DPS310_DEVICE_NOT_READY  1

(or anonymous enum) and return it instead of abstract 1 or any other
positive number?

...

> +       rc = dps310_check_reset_meas_cfg(data, DPS310_TMP_RDY);
>         if (rc < 0)
>                 goto done;
>
> +       if (rc > 0) {
> +               rate = dps310_get_temp_samp_freq(data);
> +               timeout = DPS310_POLL_TIMEOUT_US(rate);
> +
> +               /*
> +                * Poll for sensor readiness; base the timeout upon the sample
> +                * rate.
> +                */
> +               rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG,
> +                                             ready, ready & DPS310_TMP_RDY,
> +                                             DPS310_POLL_SLEEP_US(timeout),
> +                                             timeout);
> +               if (rc)
> +                       goto done;
> +       }

But have you tried to make a helper that takes a pointer to the
respective function?

-- 
With Best Regards,
Andy Shevchenko