[Bug 2122435] [NEW] drm/xe: support power limits

Public bug reported:

[ Impact ]

* Support power limits for hardware supported by drm/xe driver.

[ Fix ]

* Integrate patchset coming from https://lore.kernel.org/all/20250529163458.2354509-1-karthik.poosa@intel.com/
* Include prerequisite commit: drm/xe/hwmon: expose fan speed
* Include also a fix commit: drm/xe/hwmon: Fix xe_hwmon_power_max_write

Everything is upstream.

[ Test Plan ]

* Tested by intel.
* Compile, test on supported hardware and checks exposed hwmon sysfs entries.


[ Where problems could occur ]

* Regression in drm/xe power management.

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

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

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

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https://bugs.launchpad.net/bugs/2122435

Title:
drm/xe: support power limits

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

Bug description:
[ Impact ]

* Support power limits for hardware supported by drm/xe driver.

[ Fix ]

* Integrate patchset coming from https://lore.kernel.org/all/20250529163458.2354509-1-karthik.poosa@intel.com/
* Include prerequisite commit: drm/xe/hwmon: expose fan speed
* Include also a fix commit: drm/xe/hwmon: Fix xe_hwmon_power_max_write

Everything is upstream.

[ Test Plan ]

* Tested by intel.
* Compile, test on supported hardware and checks exposed hwmon sysfs entries.


[ Where problems could occur ]

* Regression in drm/xe power management.

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