linux-kernel - Re: [PATCH v3 0/4] P2040/P2041 i2c recovery erratum

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Message-ID: <20210512150118.GA1004@ninjato>
Date:   Wed, 12 May 2021 17:01:18 +0200
From:   "wsa@...nel.org" <wsa@...nel.org>
To:     Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
Cc:     "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "Chris.Packham@...iedtelesis.co.nz" 
        <Chris.Packham@...iedtelesis.co.nz>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/4] P2040/P2041 i2c recovery erratum


> > I've been doing my recent work with a P2040 and prior to that I did test 
> > out the recovery on a T2081 (which isn't documented to have this 
> > erratum) when I was re-working the driver. The "new" recovery actually 
> > seems better but I don't have a reliably faulty i2c device so that's 
> > only based on me writing some code to manually trigger the recovery 
> > (using the snippet below) and observing it with an oscilloscope.
> 
> You don't need a faulty device, just an aborted I2C read/write op.

If you can wire GPIOs to the bus, you can use the I2C fault injector:

	Documentation/i2c/gpio-fault-injection.rst

There are already two "incomplete transfer" injectors.


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