linux-kernel - Re: Regression 2.6.31: xc5000 no longer works with Myth-0.21-fixes branch

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Message-ID: <4A63D407.6090109@rtr.ca>
Date:	Sun, 19 Jul 2009 22:18:47 -0400
From:	Mark Lord <lkml@....ca>
To:	Devin Heitmueller <dheitmueller@...nellabs.com>
Cc:	Steven Toth <stoth@...uxtv.org>, linux-media@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Regression 2.6.31: xc5000 no longer works with Myth-0.21-fixes
 	branch

Devin Heitmueller wrote:
>
> Yeah, the situation with the seven second firmware load time is well
> known.  It's actually a result of the i2c's implementation in the
> au0828 hardware not properly supporting i2c clock stretching.  Because
> of some bugs in the hardware, I have it clocked down to something like
> 30KHz as a workaround.  I spent about a week investigating the i2c bus
> issue with my logic analyzer, and had to move on to other things.  I
> documented the gory details here back in March if you really care:
..

>From your livejournal comments, it sounded like the slow clock might
not be necessary until *after* the firmware transfer.

Mmm.. I wonder if perhaps a higher clock speed could be used
during the firmware download, and then switch to the slower 30KHz
speed afterward ?

This could reduce the firmware transfer to a couple of seconds,
much better than the current 6-7 second pause.

Cheers
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