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With the DSA spec 1.1 update, a knob to disable ATS for individually is
introduced. Add enabling code to allow a system admin to make the
configuration through sysfs.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/160530810593.1288392.2561048329116529566.stgit@djiang5-desk3.ch.intel.com

Signed-off-by: Vinod Koul <vkoul@kernel.org>