drm/i915: Allow preservation of watermarks, v2.
As Paulo has noted we can help bisectability by separating computing watermarks on a noop in 2 separate commits. This patch no longer clears the crtc watermark state, but recalculates it completely. Regardless whether a level is used the full values for each level are calculated. If a level is invalid wm[level].enable is unset. Changes since v1: - Only call ilk_validate_wm_level when level <= usable_level. (Ville) Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/56D6D09E.5040007@linux.intel.comReviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
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