linux-kernel - Re: [PATCH] i2c: bcm2835: Set up the clock stretching timeout at boot.

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Message-ID: <20160722072740.GG1605@katana>
Date:	Fri, 22 Jul 2016 09:27:40 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Eric Anholt <eric@...olt.net>
Cc:	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	Lee Jones <lee@...nel.org>, linux-i2c@...r.kernel.org
Subject: Re: [PATCH] i2c: bcm2835: Set up the clock stretching timeout at
 boot.

On Sun, Jul 03, 2016 at 06:02:32PM -0700, Eric Anholt wrote:
> Wolfram Sang <wsa@...-dreams.de> writes:
> 
> >> +	/*
> >> +	 * SMBUS says "Devices participating in a transfer will
> >> +	 * timeout when any clock low exceeds the value of
> >> +	 * T_TIMEOUT,MIN of 25 ms."
> >> +	 */
> >
> > SMBus has that timeout, but I2C doesn't. How about disabling the timeout
> > simply? Or using the max value if you want to keep the timeout
> > detection?
> 
> Disabling the timeout seems fine to me.  We still have a 1-second
> timeout around the entire transfer.  I'll be back on my DSI branch this
> week and test it out then.

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