[Intel-gfx] [PATCH 3/3] drm/i915: disable MSI on Ironlake temporarily

[Jesse Barnes]

On Mon, 02 Nov 2009 08:10:40 -0800
Keith Packard <keithp at keithp.com> wrote:

> Excerpts from Zhenyu Wang's message of Sun Nov 01 23:52:31 -0800 2009:
> 
> > +     * MSI looks unstable on Ironlake, until we find out the
> > reason, disable
> > +     * it for now.
> 
> We've had all kinds of problems when trying to run without MSI; there
> are questions about the order of operation when using regular
> interrupts.

On Ironlake running with MSIs will result in a hang after less than a
minute of activity usually.  So far using regular line level interrupts
has been solid after hours of testing.  Until we root cause the MSI
issue on Ironlake (could very well be general interrupt handling bugs)
I think we should commit this workaround to make life easier for
everyone with the hw.

Jesse