From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH 01/16 v3] pmac_zilog: fix unexpected irq
Date: Fri, 09 Dec 2011 06:44:09 +1100
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To: Finn Thain <fthain@telegraphics.com.au>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>, linux-m68k@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-serial@vger.kernel.org

On Thu, 2011-12-08 at 22:26 +1100, Finn Thain wrote:
> 
> 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... 

Well, we power the modem down and back up... but it's possible that we
fail to re-enable something, I'll check. That used to work (at least
with macserial, maybe I never tried this specific torture with pmz...).
I'll figure it out eventually.

Cheers,
Ben.