On Mon, Jan 24, 2011 at 10:49 AM, Mark Zimmerman [off-list ref] wrote:

From looking at the code and a dump of the firmware file, the first
i2c write would have a length of 3; so this error:

xc5000: I2C write failed (len=3)

tells me that there were probably no successful i2c transactions on
this device. The i2c write call looks the same as that in other
drivers, so I wonder if there is an initialization step that is now
necessary but which is missing.

Still hoping for suggestions...

My guess would be that somebody screwed up either the GPIO config int
the cx88 board profile, or the i2c gate, which is resulting in not
being able to reach the tuner at all.

Do you have an oscilloscope?  If so, I bet you will find that the
xc5000 pin is being held in reset.

I would probably take a hard look at the board profile in cx88-cards.c
as well as whether there have been any changes to the GPIO setup and
power management code.

Devin

-- 
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com