Re: More "issues" with -current - i2c problems

[Matthew Orgass <darkstar%city-net.com@localhost>]

On 2013-10-12 paul%whooppee.com@localhost wrote:

> But then I noticed that Soren had also modified the piixpm(4) driver to 
> attach multiple iic* on SB800 hardware.  Some investigation shows that 
> accessing iic[123] using i2cscan(8) causes all sorts of problems, and 
> actually locks up the i2c bus on iic0!

  This could easily be kern/47179 related (iic_acquire_bus return values 
inconsistent and often ignored), since if some device is trying to write 
bus 0 and ignores or misinterprets the return value of iic_acquire_bus 
then it will interfere with whatever bus is selected (there could be 
something else going on too if it reliably fails immediately).  Fixing 
this requires changing all iic code, so keeping numbusses = 1 for now is 
the easiest solution if that works (although I'm not sure why this issue
doesn't cause more problems even with a single bus).

-Matt