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

[Jesse Barnes]

On Mon, 02 Nov 2009 13:55:29 -0800
Eric Anholt <eric at anholt.net> wrote:

> On Mon, 2009-11-02 at 08:10 -0800, Keith Packard 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.
> 
> In fact, the docs now explicitly state that we can't do reliable
> command synchronization without MSI.

I'll see if I can find someone to talk to about this today.  At this
point with current code we can't do reliable synchronization *with*
MSI, so something is definitely broken (probably our code somewhere).

-- 
Jesse Barnes, Intel Open Source Technology Center