static bool ilk_validate_wm_level(int level,
				  const struct ilk_wm_maximums *max,
				  struct intel_wm_level *result)
static bool ilk_validate_wm_level(struct drm_i915_private *i915,
				  int level,
				  const struct ilk_wm_maximums *max,
				  struct intel_wm_level *result)