[Bug 2141377] Re: [SRU]Fix xe GPU suspend/resume crash on Battlemage

** Summary changed:

- test
+ [SRU]Fix xe GPU suspend/resume crash on Battlemage

** Description changed:

- test
+ [ Impact ]
+ Intel Battlemage xe GPU (8086:e212) crashes during system resume with
+ NULL pointer dereference in xe_guc_ads_populate_post_load(), making
+ suspend/resume non-functional on affected systems.
+
+ Root cause: Noble 6.17 kernels have commit 59cebf0bdff48 but are missing
+ its prerequisite commit 1313351e71181. Without proper forcewake handling,
+ MMIO register access causes hardware corruption.
+
+ [ Fix ]
+ Cherry-pick upstream commit from v6.18-rc1:
+ - 1313351e71181 ("drm/xe: make xe_gt_idle_disable_c6() handle the forcewake internally")
+
+ [ Test Plan ]
+ 1. System: Lenovo ThinkStation P3 Ultra G2 with Battlemage dGPU (8086:e212)
+ 2. Reproduce: rtcwake -m mem -s 10
+ 3. Verify: System resumes successfully without crashes
+
+ [ Where problems could occur ]
+ Low risk - change is localized to xe driver GT idle/power management, only
+ affects suspend/resume path. Commit is from mainline v6.18-rc1 with upstream
+ review.

** Tags added: jira-sutton-4362 oem-priority sutton

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https://bugs.launchpad.net/bugs/2141377

Title:
[SRU]Fix xe GPU suspend/resume crash on Battlemage

Status in HWE Next:
New
Status in linux package in Ubuntu:
New
Status in linux-oem-6.17 package in Ubuntu:
New

Bug description:
[ Impact ]
Intel Battlemage xe GPU (8086:e212) crashes during system resume with
NULL pointer dereference in xe_guc_ads_populate_post_load(), making
suspend/resume non-functional on affected systems.

Root cause: Noble 6.17 kernels have commit 59cebf0bdff48 but are missing
its prerequisite commit 1313351e71181. Without proper forcewake handling,
MMIO register access causes hardware corruption.

[ Fix ]
Cherry-pick upstream commit from v6.18-rc1:
- 1313351e71181 ("drm/xe: make xe_gt_idle_disable_c6() handle the forcewake internally")

[ Test Plan ]
1. System: Lenovo ThinkStation P3 Ultra G2 with Battlemage dGPU (8086:e212)
2. Reproduce: rtcwake -m mem -s 10
3. Verify: System resumes successfully without crashes

[ Where problems could occur ]
It may break xe driver GT idle/power management, affects suspend/resume path. Commit is from mainline v6.18-rc1.

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