drm/i915/gen9: implement missing case for SKL watermarks calculation
This should affect linear and X tiled planes on really small htotal cases. It doesn't seem to be a very feasible case, but let's implement it since it's on the specification and it's better to have it and never need than not have it and realize we needed it. Reviewed-by: Lyude <cpaul@redhat.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1474578035-424-9-git-send-email-paulo.r.zanoni@intel.com
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