Re: Panda ES board hang when using GPIO as interrupt

["Franky Lin" <frankyl@xxxxxxxxxxxx>]

On 06/26/2012 08:37 PM, Kevin Hilman wrote:
> "Franky Lin" <frankyl@xxxxxxxxxxxx> writes:
> > I noticed Kevin raised some similar cases on other platforms and also
> > provided two patches in the patch mail thread. But unfortunately those
> > two patches doesn't help in our case. I tested the driver with 3.5-rc3
> > mainline kernel and the issue is still there. I can only "fix" the
> > hang by either reverting the commit or disabling
> > CONFIG_PM_RUNTIME. Also, the hang only happens on Panda ES board. Old
> > Panda with 4430 works good.
> >
> > Any thoughts and suggestions?
>
> If reverting the patch fixes your problem, can you isolate down to which
> part of that patch causes the problem?  IOW, can you fix your problem if
> you undo just the hunk added in runtime_suspend or undo just the moved
> hunk runtime_resume?  Or is reverting both required?
>
> I suspect the added runtime_suspend hunk is causing the problems, so can
> you see if just undoing that part works[1].  If that works, I will give
> a bit more of a thinking on it tomorrow.

runtime_suspend hunk is fine. The hang still exist after reverting it. 
The culprit is the moved hunk in runtime_resume. Reverting it makes the 
hang disappear.

> Thanks for reporting the problem!   Bug reports like this that have
> clearly been thoroughly researched and bisected are greatly appreciated!
>
> Kevin

You are welcome.

Regards,
Franky

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