drm/i915: Enable FBC at Haswell.
This patch introduce Frame Buffer Compression (FBC) support for HSW. FBC is tied to primary plane A in HSW. v2: Ville pointed out docs say FBC must be disabled before disabling the plane on HSW. v3: Really enabling it by default at HSW. Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NRodrigo Vivi <rodrigo.vivi@gmail.com> Tested-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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