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Extract the code that calculates the DSB_HEAD/TAIL register values into small helpers. We already have two copies of this, and soon there will be a third. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com> Reviewed-by: Animesh Manna <animesh.manna@intel.com> Signed-off-by: Animesh Manna <animesh.manna@intel.com> Link: https://lore.kernel.org/r/20250523062041.166468-4-chaitanya.kumar.borah@intel.com