[Intel-gfx] [PATCH 3/3] drm/i915: Enable render context support for gen4 (Broadwater to Cantiga)

[Chris Wilson]

Quoting Ville Syrjälä (2019-01-10 16:03:21)
> After a bit of digging I found a few more potentially related
> tidbits:
> 
> ECOSPKD[4] Constant Buffer Save/Restore Disable [DevBW-C1+]

Does the trick for DevCL. I see it is still listed for g4x, so seems safe
enough to keep for IS_GEN(4) and that it would seem mere good fortune
that it did fail for DevCL highlighting the CONSTANT_BUFFER issue.
-Chris