[Intel-gfx] [PATCH] drm/i915: drop DPF code for gen8+

[Chris Wilson]

Quoting Daniele Ceraolo Spurio (2019-01-09 21:31:47)
> The only gen8+ platform that has the feature is BDW, but we don't define
> the feature flag on any BDW platform and we only have partial support in
> the gen8 path (irq enabling code, but no handler).
> The only thing we could do in the irq handler is report the error
> to userspace, but no one asked/cared about that since BDW was
> released so it is relatively safe to assume that even if we added the
> message no one would look at it. Just drop the dead code from the
> driver instead.
> 
> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>

I'm not volunteering myself to add support, and should anyone be the
code removed here would be trivial to reimplement and a mere fraction of
the code required.

Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris