[PATCH 01/16 v3] pmac_zilog: fix unexpected irq

[Finn Thain]

On Thu, 8 Dec 2011, Benjamin Herrenschmidt wrote:

> On Thu, 2011-12-08 at 15:20 +1100, Benjamin Herrenschmidt wrote:
> 
> > So basic operations seem to work, I've applied the patch to 
> > powerpc-next.

Then I guess Geert should not push this for 3.3 -- or does it make no 
difference?

> > However, the internal modem on my Pismo powerbook doesn't appear to 
> > survive suspend/resume. I'll dig into that and merge a fixup patch 
> > asap.
> 
> BTW. I applied anyway because suspend/resume was already broken (you 
> spotted that we don't clear the suspended flag for example).
> 
> Fixing the flag alone helps a bit. We can't use the modem if we 
> suspend/resume with the open port,

If the SCC IRQ counters change across suspend/resume, perhaps the modem 
itself is not powering up...

> but closing and re-opening works.

Maybe the modem wants a transition on DTR or similar, but it hasn't had 
time to initialise when that happens during SCC resumption.

If so, calling pmz_shutdown() then pmz_startup() from the tail of 
pmz_resume() without delay should probably fail to revive it...

> 
> Lockdep also picked-up a A->B B->A between the port mutex and the pmz 
> irq mutex on suspend.
> 
> I'll try to fix all these, and will let you know (I may not have time 
> today).

Thanks.

Finn

> 
> Cheers,
> Ben.
> 
> 
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