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SubjectRe: [Regression] Commit "nvme/pci: Use host managed power state for suspend" has problems
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at 04:02, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:

> On Thursday, July 25, 2019 9:52:59 PM CEST Keith Busch wrote:
>> On Thu, Jul 25, 2019 at 09:48:57PM +0200, Rafael J. Wysocki wrote:
>>> NVME Identify Controller:
>>> vid : 0x1c5c
>>> ssvid : 0x1c5c
>>> sn : MS92N171312902J0N
>>> mn : PC401 NVMe SK hynix 256GB
>>> fr : 80007E00
>>> rab : 2
>>> ieee : ace42e
>>> cmic : 0
>>> mdts : 5
>>> cntlid : 1
>>> ver : 10200
>>> rtd3r : 7a120
>>> rtd3e : 1e8480
>>> oaes : 0x200
>>> ctratt : 0
>>> oacs : 0x17
>>> acl : 7
>>> aerl : 3
>>> frmw : 0x14
>>> lpa : 0x2
>>> elpe : 255
>>> npss : 4
>>> avscc : 0x1
>>> apsta : 0x1
>>> wctemp : 352
>>> cctemp : 354
>>> mtfa : 0
>>> hmpre : 0
>>> hmmin : 0
>>> tnvmcap : 0
>>> unvmcap : 0
>>> rpmbs : 0
>>> edstt : 10
>>> dsto : 0
>>> fwug : 0
>>> kas : 0
>>> hctma : 0
>>> mntmt : 0
>>> mxtmt : 0
>>> sanicap : 0
>>> hmminds : 0
>>> hmmaxd : 0
>>> nsetidmax : 0
>>> anatt : 0
>>> anacap : 0
>>> anagrpmax : 0
>>> nanagrpid : 0
>>> sqes : 0x66
>>> cqes : 0x44
>>> maxcmd : 0
>>> nn : 1
>>> oncs : 0x1f
>>> fuses : 0x1
>>> fna : 0
>>> vwc : 0x1
>>> awun : 7
>>> awupf : 7
>>> nvscc : 1
>>> acwu : 7
>>> sgls : 0
>>> mnan : 0
>>> subnqn :
>>> ioccsz : 0
>>> iorcsz : 0
>>> icdoff : 0
>>> ctrattr : 0
>>> msdbd : 0
>>> ps 0 : mp:6.00W operational enlat:5 exlat:5 rrt:0 rrl:0
>>> rwt:0 rwl:0 idle_power:- active_power:-
>>> ps 1 : mp:3.80W operational enlat:30 exlat:30 rrt:1 rrl:1
>>> rwt:1 rwl:1 idle_power:- active_power:-
>>> ps 2 : mp:2.40W operational enlat:100 exlat:100 rrt:2 rrl:2
>>> rwt:2 rwl:2 idle_power:- active_power:-
>>> ps 3 : mp:0.0700W non-operational enlat:1000 exlat:1000 rrt:3 rrl:3
>>> rwt:3 rwl:3 idle_power:- active_power:-
>>> ps 4 : mp:0.0070W non-operational enlat:1000 exlat:5000 rrt:3 rrl:3
>>> rwt:3 rwl:3 idle_power:- active_power:-
>>
>> Hm, nothing stands out as something we can use to determine if we should
>> skip the nvme specific settings or allow D3. I've no other ideas at the
>> moment for what we may check.
>
> Well, do ASPM settings matter here?

Seems like it's a regression in the firmware.

The issue happens in version 80007E00 but not version 80006E00.
I am not sure how to downgrade it under Linux though.
The firmware changelog [1] is very interesting:
- Improves the performance of the solid-state drive (SSD) by distributing
power into the SSD efficiently according to the power state of the system.

[1]
https://www.dell.com/support/home/us/en/04/drivers/driversdetails?driverid=mcxm8

Kai-Heng

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