NVMe APST high latency power states being skipped

[Christoph Hellwig]

On Fri, Jun 02, 2017 at 12:13:37AM -0700, Christoph Hellwig wrote:
> > Maybe add an extra knob which can directly control deepest allow power
> > state? Userspace tools can control deepest power state through this
> > knob.
> 
> I'd prefer that things work out of the box.  I'd be tempted to just
> bump up the latency requirement to cover the device, but if Andy
> doesn't like that in general we could add a quirk for this device
> to at least allow it to use deep power states.

Kai, can you send the patch to bump default_ps_max_latency_us to
reasonably high value that all the devices you are testing are
able to use PS3/4?