[Bug 2122421] [NEW] drm/xe/bmg: fix frequency changes workaround

Public bug reported:

[ Impact ]

* Previous workaround was limiting BMG frequency in some circumstances
but didn't wait for it to reduce effectively before proceeding.

[ Fix ]

* This is fixed by upstream commit: deea6a7d6d8 drm/xe/bmg: Update Wa_22019338487
* This commit has been included part of v6.15.6
* Cherry pick it and other related commit that leads to it.

[ Test Plan ]

* Tested by intel.
* Built and boot tested and supported device.

[ Where problems could occur ]

* Regression in the BMG driver and graphics handling.

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

** Affects: linux (Ubuntu Plucky)
Importance: Medium
Assignee: Thibault Ferrante (thibf)
Status: In Progress

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

** Changed in: linux (Ubuntu Plucky)
Status: New => In Progress

** Changed in: linux (Ubuntu Plucky)
Assignee: (unassigned) => Thibault Ferrante (thibf)

** Changed in: linux (Ubuntu Plucky)
Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/2122421

Title:
drm/xe/bmg: fix frequency changes workaround

Status in linux package in Ubuntu:
New
Status in linux source package in Plucky:
In Progress

Bug description:
[ Impact ]

* Previous workaround was limiting BMG frequency in some
circumstances but didn't wait for it to reduce effectively before
proceeding.

[ Fix ]

* This is fixed by upstream commit: deea6a7d6d8 drm/xe/bmg: Update Wa_22019338487
* This commit has been included part of v6.15.6
* Cherry pick it and other related commit that leads to it.

[ Test Plan ]

* Tested by intel.
* Built and boot tested and supported device.

[ Where problems could occur ]

* Regression in the BMG driver and graphics handling.

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