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

From: wsa@xxxxxxxxxx
Date: Wed May 12 2021 - 11:16:01 EST



> > 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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