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

Keith Packard keithp at keithp.com
Wed Jan 11 05:44:20 CET 2012

On Tue, 10 Jan 2012 16:51:08 -0800, Eric Anholt <eric at anholt.net> wrote:

> So they've gone out of their way to build broken stuff.  Awesome.

Well, in theory, the interrupt would be generated *before* the hardware
goes to RC6; when idle, I'm not exactly sure what the hardware would be
doing to generate interrupts.

> I'd say you've found the clue here -- I'm a lot happier with going with
> your patches now (and I was pretty happy with the gen7 side before).
> I'd just like to not mess with gen6 unless we've got missed irq bugs
> there to fix.

Yeah, knowing that there might be interrupt funnies due to RC6 goes some
way to explaining why just avoiding RC6 helps.

I wonder if any of this might explain the RC6 issues we see on SNB on
some hardware, and whether we should give this a try... I know, grasping
at straws, but still, it's about all we have at this point.

keith.packard at intel.com
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