[Bug 217931] amd-pstate lacks crucial features: CPU frequency and boost control

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217931

--- Comment #25 from Mario Limonciello (AMD) (mario.limonciello@amd.com) ---
Writing scaling_max_freq updates the cpufreq policy (see store_##file_name). 
That function through a series of events (see freq_qos_update_request()) is
supposed to be calling into amd-pstate to flush it out to hardware.

For passive/guided mode it uses .target() callback for amd-pstate.  For active
mode it uses ,setpolicy() callback for amd-pstate-epp.

Can you guys try turning on the dynamic debugging for amd-pstate?  It has a
debug line that will confirm when policies are flushed from the core into the
driver.

        pr_debug("set_policy: cpuinfo.max %u policy->max %u\n",
                                policy->cpuinfo.max_freq, policy->max);

That can help give a hint if this is a core or driver issue that it's not
working immediately.

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