Errant readings on LM81 with T2080 SoC

[Wolfram Sang]

> Bummer. What is really weird is that you see clock stretching under
> CPU load. Normally clock stretching is triggered by the device, not
> by the host.

One example: Some hosts need an interrupt per byte to know if they
should send ACK or NACK. If that interrupt is delayed, they stretch the
clock.

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