[PATCH 0/1] [mantic:linux] drm/ast: Add BMC virtual connector

[Philip Cox]

BugLink: https://bugs.launchpad.net/bugs/2042850

SRU Justification:

[Impact]
On systems with Aspeed 2600 revision 52 GPUs, the display fails to progress to the login prompt.  With the commit (added in 6.5.0-6.6)

   commit: 916ae609a033cbb55661905d310ba2358b7621ea
   Author:  Jocelyn Falempe <jfalempe at redhat.com>
   Date:    Thu Jul 13 15:41:31 2023 +0200
   Subject: drm/ast: report connection status on Display Port.

 the Aspeed 2600 rev 52 GPUs have issues.

They need the commit:

This change was dependant on the upstream change
commit e329cb53b45da475966c4b2e49f6a4a430f307fa
Author: Jocelyn Falempe <jfalempe at redhat.com>
Date: Thu Jul 13 15:41:30 2023 +0200
Subject: drm/ast: Add BMC virtual connector

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e329cb53b45da475966c4b2e49f6a4a430f307fa


in order to have the display work correctly on the rev52 GPUs.  



[Fix]
With cherry-picking this change, the functionality of BMCs using Aspeed 2600 rev52 GPUs work as expected, as they did prior to the regression in 6.5.0-6.6. 

[Test Plan]
I have tested this on multiple versions of Aspeed 2600 GPU enabled BMCs, and the revision 52 systems that required the nomodeset option to boot to the prompt, now boot fine and display the login prompt, and there is no regression on the other systems.  I have tested this on different Aspeed GPUs, and have not seen any regressions, or unexpected behaviour. 


[Where problems could occur]
As this fixes a regression of  functionality for the mantic kernel's Aspeed GPU driver on a very specific version of some BMCs to the state it was was in the mantic 6.5.0-5.5 kernel, I think there is little room for regressions.  

---

Jocelyn Falempe (1):
  drm/ast: Add BMC virtual connector

 drivers/gpu/drm/ast/ast_drv.h  |  4 +++
 drivers/gpu/drm/ast/ast_mode.c | 57 ++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

-- 
2.34.1