linux-kernel - Re: [PATCH 3/3] cyber2000fb: add I2C support

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Message-ID: <20100731214242.GB3633@n2100.arm.linux.org.uk>
Date:	Sat, 31 Jul 2010 22:42:42 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Ondrej Zary <linux@...nbow-software.org>
Cc:	linux-fbdev@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] cyber2000fb: add I2C support

On Sat, Jul 31, 2010 at 10:55:49PM +0200, Ondrej Zary wrote:
> Add I2C support for the DDC bus to cyber2000fb driver. This is only bus
> support, driver does not use EDID.
> Tested on two different CyberPro 2000 cards with i2cdetect and decode-edid.

I'm debating a bit about this.

One thing I'm concerned about is switching the DCLK registers to DCC
mode without any protection against mode changes co-inciding with
I2C activity.  On a SMP machine, it's possible for both to happen
simultaneously.

Secondly, please name these I2C bits with 'ddc' in the name - the
CyberPro appear to have more than one I2C bus on them (or can have)
such as for driving SAA7111 video decoders.
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