cafe_ccic smbus issues
wmb at firmworks.com
Mon Apr 30 12:47:38 EDT 2007
Jonathan Corbet wrote:
> Andres Salomon <dilinger at laptop.org> wrote:
>> The question is now, why wouldn't we be seeing interrupts?
> A good question.
> Anyway...possible reasons for not getting interrupts:
> - Something changed in the pre-b3 board such that the interrupt line
> from the camera controller no longer reaches the CPU. Seems
Actually, this is exactly what happened. The CaFe INT pin was routed to
a different GPIO on the 5536 in order to make room for a new INT from
the LX chip itself.
We found and fixed this yesterday.
> - Something changed in the Cafe startup dance with the result that
> interrupts are no longer being enabled in the controller. That
> ritual has changed before...have there been Cafe changes this time
> - The interrupt line is being masked in the CPU somehow. Are there any
> "nobody cared!" messages in the logs? What else is sharing the
> camera interrupt line on this board?
> - This board has the faster processor, right? It's possible that there
> is a timing-related issue somewhere - the controller needs a delay
> that wasn't required before.
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