[Intel-gfx] [PATCH] drm/i915: paper over missed irq issues with force wake vodoo

[Eugeni Dodonov]

On Thu, Jan 5, 2012 at 09:13, Daniel Vetter <daniel at ffwll.ch> wrote:

> On Wed, Jan 04, 2012 at 06:27:40PM -0800, Keith Packard wrote:
> > On Wed,  4 Jan 2012 19:40:45 +0100, Daniel Vetter <
> daniel.vetter at ffwll.ch> wrote:
> >
> > > Two things seem to do the trick on my ivb machine here:
> > > - prevent the gt from powering down while waiting for seqno
> > >   notification interrupts by grabbing the force_wake in get_irq (and
> > >   dropping it in put_irq again).
> > > - ordering writes from the ring's CS by reading a CS register, ACTHD
> > >   seems to work.
> >
> > If this works reliably, you'll deserve a medal...
>
> I've removed the HWSTAM workaround on my branch and both my ivb and snb
> seem to still work. So I'm still hopeful that this actually works ;-)
>

Yep, it seems to work even without HWSTAM, I tried this too with base on
Ben's HWSTAM disabling patches.

So I think we have a winner :).

-- 
Eugeni Dodonov
<http://eugeni.dodonov.net/>
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