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baf69ca8a5
All platforms until SKL compute their watermarks essentially using the same method1/small buffer and method2/large buffer formulas. Most just open code it in slightly different ways. Let's pull it all into common helpers. This makes it a little easier to spot the actual differences. While at it try to add some docs explainign what the formulas are trying to do. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170421181432.15216-11-ville.syrjala@linux.intel.com Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>