On 2020-08-24 16:10, Viresh Kumar wrote:

+Vincent/Saravana/Sibi

On 21-08-20, 16:00, Ansuel Smith wrote:

quoted

This adds Krait Cache scaling support using the cpufreq notifier.
I have some doubt about where this should be actually placed (clk or 
cpufreq)?
Also the original idea was to create a dedicated cpufreq driver (like 
it's done in
the codeaurora qcom repo) by copying the cpufreq-dt driver and adding 
the cache
scaling logic but i still don't know what is better. Have a very 
similar driver or
add a dedicated driver only for the cache using the cpufreq notifier 
and do the
scale on every freq transition.
Thanks to everyone who will review or answer these questions.

Saravana was doing something with devfreq to solve such issues if I
wasn't mistaken.

Sibi ?

IIRC the final plan was to create a devfreq device
and devfreq-cpufreq based governor to scale them, this
way one can switch to a different governor if required.
(I don't see if ^^ applies well for l2 though). In the
interim until such a solution is acked on the list we
just scale the resources directly from the cpufreq
driver. On SDM845/SC7180 SoCs, L3 is modeled as a
interconnect provider and is directly scaled from the
cpufreq-hw driver.

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