[Bug 217696] Looking for a way to enable power saving mode for Ryzen APUs, along with limiting the upper temperature and total power consumption

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217696

--- Comment #22 from Mario Limonciello (AMD) (mario.limonciello@amd.com) ---
> The patched driver outputs slightly different debug messages:

This looks correct to me now for what amd-pmf can support today.

> Originally I was looking for a way to control my APU TDP(TTP) and maximum
> temperature threshold *without* using ryzenadj because CPU control registers
> are locked in secure boot mode.

This isn't something AMD supports.  The APU coefficients are set by system
designers in their firmware as a result of the hardware design decisions.

That's why I'm fixating on getting the method of coefficient configuration
working.  Some OEMs do it entirely in their EC, some do it entirely in PMF,
some do a combination and some it with the involvement of code running in TEE.

We will need to wait until the other bits are supported by amd-pmf to revisit
this issue.

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