[PATCH 0/1] [mantic:linux] Revert: drm/ast: report connection status on Display Port

[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.  Without reverting 

   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 kernel command line option of "nomodeset" needs to be passed in order to have the system reach the login prompt. 


[Fix]
The fix for now is to revert this change to restore the previous behaviour.  This will restore the functionality that we had 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, now boot fine, and there is no regression on the other systems.

[Where problems could occur]
As this reverts the mantic kernel's Aspeed GPU driver to the state it was was in the mantic 6.5.0-5.5 kernel, I think there is little room for regressions.  

----

Philip Cox (1):
  UBUNTU: SAUCE: (no-up) Revert "drm/ast: report connection status on
    Display Port."

 drivers/gpu/drm/ast/ast_dp.c    | 11 ----------
 drivers/gpu/drm/ast/ast_dp501.c | 37 +++++++++++----------------------
 drivers/gpu/drm/ast/ast_drv.h   |  2 --
 drivers/gpu/drm/ast/ast_mode.c  | 30 ++------------------------
 4 files changed, 14 insertions(+), 66 deletions(-)

-- 
2.34.1