drm/i915: Calculate max watermark levels for ILK+
There are quite a few variables we need to take into account to determine the maximum watermark levels, so it feels a bit cleaner to calculate those rather than just have a bunch of what look like magic numbers. v2: s/pipes_active/num_pipes_active s/othwewise/otherwise Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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