linux-kernel - Re: [PATCH v7 0/2] iio: pressure: dps310: Reset chip if MEAS

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Message-ID: <CAHp75VfJdmeh54Us2P68sJ7qR8M+_AAByv8_hFPCk2QN0mTfig@mail.gmail.com>
Date:   Wed, 14 Sep 2022 13:58:03 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     jic23@...nel.org, lars@...afoo.de, linux-iio@...r.kernel.org,
        joel@....id.au, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v7 0/2] iio: pressure: dps310: Reset chip if MEAS_CFG is corrupt

On Tue, Sep 13, 2022 at 12:27 AM Eddie James <eajames@...ux.ibm.com> wrote:
>
> The DPS310 chip has been observed to get "stuck" such that pressure
> and temperature measurements are never indicated as "ready" in the
> MEAS_CFG register. The only solution is to reset the device and try
> again. In order to avoid continual failures, use a boolean flag to
> only try the reset after timeout once if errors persist. Include a
> patch to move the startup procedure into a function.

Good enough, although having a couple of nit-picks.
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Changes since v6:
>  - Use helper instead of the lengthy regmap_read_poll_timeout twice
>  - Just return dps310_startup in dps310_reset_reinit
>
> Changes since v5:
>  - Completely rework the second patch to reset and reinit in any
>    timeout condition, if there haven't been previous timeouts that
>    failed to recover the chip.
>
> Changes since v4:
>  - Just check for rc rather than rc < 0 in some cases
>  - Split declaration and init of rc
>
> Changes since v3:
>  - Don't check regmap* return codes for < 0
>  - Fix comment spelling
>
> Changes since v2:
>  - Add some comments
>  - Fix the clunky control flow
>
> Changes since v1:
>  - Separate into two patches
>  - Rename 'dps310_verify_meas_cfg' to 'dps310_check_reset_meas_cfg'
>
> Eddie James (2):
>   iio: pressure: dps310: Refactor startup procedure
>   iio: pressure: dps310: Reset chip after timeout
>
>  drivers/iio/pressure/dps310.c | 266 +++++++++++++++++++++-------------
>  1 file changed, 167 insertions(+), 99 deletions(-)
>
> --
> 2.31.1
>


-- 
With Best Regards,
Andy Shevchenko