[Bug 217947] WARNING at drivers/acpi/platform_profile.c:74 in platform_profile_show()

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217947

--- Comment #2 from Mark Pearson (mpearson-lenovo@squebb.ca) ---
Hi,

Can I confirm this is on a T14s G3 AMD platform?

Thanks for the detailed report - very helpful and very much appreciated. I'll
need to reproduce this but I don't have one of these platforms myself so will
need to ask a colleague for help.

It looks like this line is causing problems on this platform:
funcmode = (output >> DYTC_GET_FUNCTION_BIT) & 0xF;

Normally that should return PSC mode (in this case - unless you have AMT mode,
which you don't on that gen platform). 
But it's saying it is in standard mode instead....which is peculiar. The FW is
doing something non-standard to other platforms.

Do you still get the warning when:
 - you're in performance or low-power modes?
 - you're in lap mode?

As a quick test could you try adding:

 /* Check if we are PSC mode, or have AMT enabled */
 funcmode = (output >> DYTC_GET_FUNCTION_BIT) & 0xF;
+if (funcmode == DYTC_FUNCTION_STD)
+  funcmode = DYTC_FUNCTION_PSC;

To see if it behaves correctly please?

I'll have to check with the FW team and find out why this change in
behaviour...I suspect I need to do a kernel patch to better handle this AMT
case though.

Mark

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