Public bug reported:

[Impact]
KIOXIA NVMe has a 10% chance to stop working after S3.

[Fix]
Enable ACS quirk on Intel CML root port.

[Test]
With the patch applied, KIOXIA NVMe always works after S3.

[Regression Potential]
ACS works at hardware level, so I can't really assess the risk of
regression. Since Intel confirmed CML also needs ACS quirk, we can only
trust them.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: linux-oem-5.6 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Focal)
     Importance: Undecided
         Status: Confirmed

** Affects: linux-oem-5.6 (Ubuntu Focal)
     Importance: Undecided
         Status: Confirmed

** Affects: linux (Ubuntu Groovy)
     Importance: Undecided
         Status: Confirmed

** Affects: linux-oem-5.6 (Ubuntu Groovy)
     Importance: Undecided
         Status: Won't Fix


** Tags: oem-priority originate-from-1893902 stella

** Also affects: linux (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: linux-oem-5.6 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux-oem-5.6 (Ubuntu Groovy)
       Status: New => Won't Fix

** Changed in: linux (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Groovy)
       Status: New => Confirmed

** Changed in: linux-oem-5.6 (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: linux-oem-5.6 (Ubuntu)
       Status: New => Invalid

** Tags added: oem-priority originate-from-1893902 stella

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https://bugs.launchpad.net/bugs/1895718

Title:
  Fix non-working NVMe after S3

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem-5.6 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Confirmed
Status in linux-oem-5.6 source package in Focal:
  Confirmed
Status in linux source package in Groovy:
  Confirmed
Status in linux-oem-5.6 source package in Groovy:
  Won't Fix

Bug description:
  [Impact]
  KIOXIA NVMe has a 10% chance to stop working after S3.

  [Fix]
  Enable ACS quirk on Intel CML root port.

  [Test]
  With the patch applied, KIOXIA NVMe always works after S3.

  [Regression Potential]
  ACS works at hardware level, so I can't really assess the risk of
  regression. Since Intel confirmed CML also needs ACS quirk, we can only
  trust them.

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