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If the machine doesn't support PSR, it will return -ENODEV from i915_edp_psr_status, which we want to interpret as unsupported. This is in line with what Chris just fixed for FBC. V2: Copy-pasted to the correct position. Signed-off-by: Marta Lofstedt <marta.lofstedt@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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