[Intel-gfx] [PATCH 2/2] drm/i915: Enable render context support for gen4 (Broadwater to Cantiga)

[Chris Wilson]

Quoting Kenneth Graunke (2019-01-09 09:02:35)
> Does it work if you emit 3DSTATE_GLOBAL_DEPTH_OFFSET_CLAMP after
> MI_SET_CONTEXT?  That was the source of most CONSTANT_BUFFER hangs
> I saw on Broadwater/Crestline.  Notably, it's also a bug that was
> fixed on Eaglelake/Cantiga...

Thanks for the suggestion, but alas no. Which makes sense if my
understanding is correct and it is the immediate execution of
CONSTANT_BUFFER inside the context image that is triggering the hang --
we don't even reach the next primitive.

I think have DevCL happy (at least as far as a few runs through piglit
can determine), now to double check DevCTG, DevILK. Alas I have no
gen4/gen5 desktop machines to hand.
-Chris