drm/i915: Remove the impedance mismatch around intel_engine_enable_signaling
There is some redundancy between dma_fence->ops->enable_signaling (via i915_fence_enable_signaling) and our backend, intel_engine_enable_signaling() in that both levels recheck the fence status multiple times. If we convert intel_engine_enable_signaling() to return the information desired by dma_fence->ops->enable_signaling, we can reduce i915_fence_enable_signaling to a simple stub and avoid trying to reinterpret the same information. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Cc: Michal Winiarski <michal.winiarski@intel.com> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180308140732.25090-1-chris@chris-wilson.co.uk
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