cafe_ccic smbus issues
corbet at lwn.net
Mon Apr 30 11:55:45 EDT 2007
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
- 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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