APST not working on Intel p1600x

[Keith Busch]

On Thu, May 22, 2025 at 04:07:15PM -0600, Keith Busch wrote:
> As to why the driver does this, spec section 8.1.17.2 "Autonomous Power
> State Transitions" has the answer:
> 
> 	The power state to transition to shall be a non-operational
> 	power state
> 
> I'm not sure why the spec decided on that behavior.

Well, it's that you need more info to capture when to autonomously
transition to a higher power state when you're already in a degraded
operational one. Does the device switch to a higher power after one
command, or should it handle it in its lower operational power state?
There's no spec guidance here, so the requirement makes sense, but I
think this could have been sorted out.