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Subject: Re: Bamboo PCI interrupt issues
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Segher Boessenkool <segher@kernel.crashing.org>
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Date: Wed, 05 Mar 2008 08:01:30 +1100
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Cc: kvm-ppc-devel <kvm-ppc-devel@lists.sourceforge.net>,
	linuxppc-dev@ozlabs.org, Stefan Roese <sr@denx.de>,
	Hollis Blanchard <hollisb@us.ibm.com>
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On Tue, 2008-03-04 at 21:59 +0100, Segher Boessenkool wrote:
> >> More generally, the target interrupt descriptors (sense values, in
> >> particular) in a device tree interrupt map describe the interrupts as
> >> seen on the target interrupt controller, *not* as seen on this 
> >> (source)
> >> interrupt domain.  This should be obvious, but since the source
> >> interrupt
> >> descriptor for PCI doesn't have a sense value (it's always level low,
> >> after all), it can be confusing.  Well, interrupts always are 
> >> confusing
> >> :-)
> >
> > Sure. But if your stupid bridge sticks a not gate between the PIRQ 
> > input
> > and the UIC (interrupt controller), effectively, the UIC sees a 
> > reversed
> > polarity. Thus you need to put in your interrupt map a reversed 
> > polarity
> > information for the UIC interrupt specifiers.
> 
> That's what I said, isn't it?  :-)

Maybe, I wasn't sure I decrypted you properly :-)

Ben.