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The NVM Express Base Specification 2.0 specifies in the description of the CC – Controller Configuration register: "Host software shall set the Arbitration Mechanism Selected (CC.AMS), the Memory Page Size (CC.MPS), and the I/O Command Set Selected (CC.CSS) to valid values prior to enabling the controller by setting CC.EN to ‘1’. While we haven't seen any controller misbehaving while setting all bits in a single write, let's do it in the order that it is written in the spec, as there could potentially be controllers that are implemented to rely on the configuration bits being set before enabling the controller. Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> |
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