drm/i915: introduce haswell_init_clock_gating
This is based on Ivy Bridge clock gating for now, but is subject to changes in the future. Note: Compared to the ivb clock gating this drops the the IDICOS medium uncore sharing tuned in commit 20848223 Author: Ben Widawsky <ben@bwidawsk.net> Date: Fri May 4 18:58:59 2012 -0700 drm/i915: set IDICOS to medium uncore resources Eugeni wants to benchmark the effect of this first. Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com> [danvet: added note] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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