linux-kernel - Re: Errant readings on LM81 with T2080 SoC

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Message-ID: <20210311081842.GA1070@ninjato>
Date:   Thu, 11 Mar 2021 09:18:42 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>,
        "jdelvare@...e.com" <jdelvare@...e.com>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: Errant readings on LM81 with T2080 SoC


> 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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