From mboxrd@z Thu Jan  1 00:00:00 1970
From: hch@infradead.org (Christoph Hellwig)
Date: Tue, 6 Jun 2017 02:54:54 -0700
Subject: NVMe APST high latency power states being skipped
In-Reply-To: <20170602071337.GA11447@infradead.org>
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 <5bfa6cf7e8994bc593f95e8641f648f5@ausx13mpc120.AMER.DELL.COM>
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 <CALCETrX+87zvN7sw-1qQHjQ_Bz9mSrjrHJLA9NBzaKSddntUug@mail.gmail.com>
 <CAAd53p7o4VRcb1=EE5Vx7rMAfxdpKGceAeVfaCuDrvUaV6x65g@mail.gmail.com>
 <20170526092556.GA645@infradead.org>
 <CAAd53p4qdk2ngC7-BNB++ZLKK39-MiUp22PT6wcsRzxCHzmniw@mail.gmail.com>
 <20170601113206.GA29895@infradead.org>
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 <20170602071337.GA11447@infradead.org>
Message-ID: <20170606095454.GA13569@infradead.org>

On Fri, Jun 02, 2017@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?