i915_driver_irq_handler: irq 42: nobody cared

[Jesse Barnes]

On Fri, 30 Mar 2012 11:45:43 +0100
Chris Wilson <chris at chris-wilson.co.uk> wrote:

> On Fri, 30 Mar 2012 11:59:28 +0200, Jiri Slaby <jslaby at suse.cz> wrote:
> > I don't know what to dump more, because iir is obviously zero too. What
> > other sources of interrupts are on the (G33) chip?
> 
> IIR is the master interrupt, with chained secondary interrupt statuses.
> If IIR is 0, the interrupt wasn't raised by the GPU.

I've actually seen cases where one of the PIPE*STAT regs is stuck, and
even if IIR is 0 we still get interrupts... Jiri can you verify the
PIPE*STAT regs have bits set, maybe one or more we don't check for?

-- 
Jesse Barnes, Intel Open Source Technology Center
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