linux-kernel - Re: Sluggish AT91 I2C driver causes SMBus timeouts

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Message-ID: <20171013142935.14ef302e@alans-desktop>
Date:   Fri, 13 Oct 2017 14:29:35 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Peter Rosin <peda@...ntia.se>
Cc:     Ludovic Desroches <ludovic.desroches@...rochip.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>
Subject: Re: Sluggish AT91 I2C driver causes SMBus timeouts

On Thu, 12 Oct 2017 13:35:17 +0200
Peter Rosin <peda@...ntia.se> wrote:

> Hi!
> 
> I have encountered an "interesting" bug. It silently corrupts data
> and is generally nasty...
> 
> On an I2C bus, driven by the at91 driver and DMA (an Atmel
> sama5d31 chip), I have an 256 byte eeprom (NXP SE97BTP). I'm using
> Linux v4.13.

If your force the transfer to PIO does it behave ? Does the controller in
fact need to siwtch to PIO for SMBUS ?

Alan