BACKPORT: nvme: relax APST default max latency to 100ms

Christoph Hellwig suggests we should to make APST work out of the box.
Hence relax the the default max latency to make them able to enter
deepest power state on default.

Here are id-ctrl excerpts from two high latency NVMes:

vid     : 0x14a4
ssvid   : 0x1b4b
mn      : CX2-GB1024-Q11 NVMe LITEON 1024GB
ps    3 : mp:0.1000W non-operational enlat:5000 exlat:5000 rrt:3 rrl:3
          rwt:3 rwl:3 idle_power:- active_power:-
ps    4 : mp:0.0100W non-operational enlat:50000 exlat:100000 rrt:4 rrl:4
          rwt:4 rwl:4 idle_power:- active_power:-

vid     : 0x15b7
ssvid   : 0x1b4b
mn      : A400 NVMe SanDisk 512GB
ps    3 : mp:0.0500W non-operational enlat:51000 exlat:10000 rrt:0 rrl:0
          rwt:0 rwl:0 idle_power:- active_power:-
ps    4 : mp:0.0055W non-operational enlat:1000000 exlat:100000 rrt:0 rrl:0
          rwt:0 rwl:0 idle_power:- active_power:-

Signed-off-by: Kai-Heng Feng <>
Signed-off-by: Christoph Hellwig <>
(cherry picked from commit 9947d6a09cd71937dade2fc14640e4843ae19802)

TEST=lower power at S0, dmesg said APST enabled.
APST enabled: max PS = 4, max round-trip latency = 5500us

Change-Id: Ie42b2da6f425139d91cfb929e38b473be8da673c
Signed-off-by: Puthikorn Voravootivat <>
Reviewed-by: Gwendal Grignou <>
Reviewed-by: Todd Broch <>
1 file changed