[Bug 221505] REGRESSION][amd_pstate] "EPP cannot be set under performance policy" (EBUSY) when switching to performance profile via PPD on 7.1

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221505

--- Comment #8 from Sergey (sergeyluashkov@gmail.com) ---
(In reply to Mario Limonciello (AMD) from comment #7)
> Can you please pair that patch with the patches on this branch?
> https://git.kernel.org/pub/scm/linux/kernel/git/superm1/linux.git/log/?h=amd-
> pstate-fixes
> 
> There are multiple bugs at play here.

I’ve tested the kernel from your amd-pstate-fixes branch (commit f9f16835d4dc),
but unfortunately, the issues persist, and I’ve discovered a new conflict with
the ASUS platform driver.

Current observations:

With amd_dynamic_epp=disable (or no parameter):
The behavior remains identical to the initial report. powerprofilesctl still
fails with the error described in the original report (Description).

With amd_dynamic_epp=enable:
It breaks the integration with asus-nb-wmi.
Specifically, the /sys/devices/platform/asus-nb-wmi/throttle_thermal_policy
(which controls ASUS thermal profiles) stops switching to value 2
(Silent/Power-save mode).

When I set "Power-saver" via PPD, it only toggles between 0 and 1.

The CPU TDP is not limited to its expected ~55W threshold unless I manually
write 2 to the throttle_thermal_policy file.

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