Proposed fix for the suspend/resume pop

[Jordan Crouse]

On 16/03/07 12:14 -1000, Mitch Bradley wrote:
> The AC-link driver is an attractive alternative.  If we decide to 
> control it via the AC-link driver, we should either use a 5536 GPIO or 
> add a specific command to the EC command set.  Ultimately we want to 
> disable the CPU's ability to directly twiddle EC GPIOs, as a security 
> measure.
> 
> We are really short on 5536 GPIOs, but we could "buy back" 2 or 3 of 
> them by moving signals like DCONSTAT (inputs which need not trigger 
> interrupts) to IDE data lines.  (It is possible to use the IDE data 
> lines as general purpose inputs, so long as you only need to look at 
> them, and not to do hardware event counting or trigger interrupts.).

We could also put on a SMBUS attached GPIO extender, which would also
give us general purpose output (but still no event counting or triggering).
of course thats extra cost.  We also have the two unused EDID lines for
the VGA connector that could be used for various GPIOish purposes.

Jordan