drm/i915: Store the watermark latency values in dev_priv
Rather than having to read the latency values out every time, just store them in dev_priv. On ILK and IVB there is a difference between some of the latency values for different planes, so store the latency values for each plane type separately, and apply the necesary fixups during init. v2: Fix some checkpatch complaints Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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