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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Wed, 2 Feb 2022 17:02:46 +0200
Message-ID: <CAHp75VfLFKinChE2H-Lsb1A50JOOMettsshSZWoDkVNSW6ckLQ@mail.gmail.com>
Subject: Re: [PROBLEM]: Error during probing process in inv_icm42600_i2c driver
To:     Jean-Baptiste Maneyrol <Jean-Baptiste.Maneyrol@tdk.com>
Cc:     Jonathan Cameron <jic23@kernel.org>,
        Nikos Latmos <n.latmos@deepsea.ai>,
        "jmaneyrol@invensense.com" <jmaneyrol@invensense.com>,
        "lars@metafoo.de" <lars@metafoo.de>,
        "linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Tue, Feb 1, 2022 at 10:17 PM Jean-Baptiste Maneyrol
<Jean-Baptiste.Maneyrol@tdk.com> wrote:
>
> Hello,
>
> this is a known issue. When setting I2C parameters, it enables some specific filter for improving transfer quality. These filters are by default disabled to enable I3C usage.
>
> This operation creates a spike in the lines that make the transaction fails even if it is in fact doing OK.
>
> Do not change the register value. The fix is to ignore the return value of the regmap_update_bits done on INV_ICM42600_REG_INTF_CONFIG6.
>
> If you want to create a patch, it would be very welcomed I could review it.

That patch should have a good comment to summarize the above.

-- 
With Best Regards,
Andy Shevchenko