Public bug reported:

---Problem Description---
Normally nx-compress and nx-842-powernv modules are loaded when selects 842-nx 
compressor if not loaded and execute forever during system execution. So we 
will not see this bug in normal case. 

But we are seeing NX CRB request timeout when uninstall these modules and load 
them or select 842-nx compressor. 
  
---uname output---
18.04
 
Machine Type = P9 system 
  
---Steps to Reproduce---
- Install  nx-compress and nx-842-powernv modules
- Initiate NX request
- Uninstall these modules
- Initiate NX request again and we get CRB timeout with error -110

Patches are included in 4.19-rc1

6e708000ec2c93c2bde6a46aa2d6c3e80d4eaeb9 - powerpc/powernv: Export 
opal_check_token symbol
656ecc16e8fc2ab44b3d70e3fcc197a7020d0ca5 -  crypto/nx: Initialize 842 high and 
normal RxFIFO control registers

> Looks like the first commit was included in a recent 18.04 update
> (4.15.0-48.51), see
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1819989
> 
> but I don't see the second one there yet.
> 
> If this is still needed, I would suggest getting this bug mirrored to LP to
> put on Canonical's radar.

We need second commit (656ecc16e8fc2ab44b3d70e3fcc197a7020d0ca) to fix
this actual issue. But no use of having the first commit without second
one. The first one just exports opal_check_token symbol which is used in
the second commit.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-166573 severity-medium 
targetmilestone-inin18041

** Tags added: architecture-ppc64le bugnameltc-166573 severity-medium
targetmilestone-inin18041

** Changed in: ubuntu
     Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage 
(ubuntu-power-triage)

** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1827755

Title:
  nx842 - CRB request time out (-110) when uninstall NX modules and
  initiate NX request

Status in linux package in Ubuntu:
  New

Bug description:
  ---Problem Description---
  Normally nx-compress and nx-842-powernv modules are loaded when selects 
842-nx compressor if not loaded and execute forever during system execution. So 
we will not see this bug in normal case. 

  But we are seeing NX CRB request timeout when uninstall these modules and 
load them or select 842-nx compressor. 
    
  ---uname output---
  18.04
   
  Machine Type = P9 system 
    
  ---Steps to Reproduce---
  - Install  nx-compress and nx-842-powernv modules
  - Initiate NX request
  - Uninstall these modules
  - Initiate NX request again and we get CRB timeout with error -110

  Patches are included in 4.19-rc1

  6e708000ec2c93c2bde6a46aa2d6c3e80d4eaeb9 - powerpc/powernv: Export 
opal_check_token symbol
  656ecc16e8fc2ab44b3d70e3fcc197a7020d0ca5 -  crypto/nx: Initialize 842 high 
and normal RxFIFO control registers

  > Looks like the first commit was included in a recent 18.04 update
  > (4.15.0-48.51), see
  > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1819989
  > 
  > but I don't see the second one there yet.
  > 
  > If this is still needed, I would suggest getting this bug mirrored to LP to
  > put on Canonical's radar.

  We need second commit (656ecc16e8fc2ab44b3d70e3fcc197a7020d0ca) to fix
  this actual issue. But no use of having the first commit without
  second one. The first one just exports opal_check_token symbol which
  is used in the second commit.

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