drm/i915: calculate watermarks for devices that have 3 pipes
This adds proper support for calculating those watermarks, checking for number of available pipes instead of specific GPU variants when deciding if watermarks for 3rd pipe are necessary. Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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