linux-kernel - Re: [PATCH v3 0/5] Refactor thermal pressure update to avoid code duplication

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Date:   Tue, 9 Nov 2021 09:46:23 -0600
From:   Steev Klimaszewski <steev@...i.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     Thara Gopinath <thara.gopinath@...aro.org>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, sudeep.holla@....com,
        will@...nel.org, catalin.marinas@....com, linux@...linux.org.uk,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        viresh.kumar@...aro.org, amitk@...nel.org,
        daniel.lezcano@...aro.org, amit.kachhap@...il.com,
        bjorn.andersson@...aro.org, agross@...nel.org
Subject: Re: [PATCH v3 0/5] Refactor thermal pressure update to avoid code
 duplication


On 11/9/21 2:29 AM, Lukasz Luba wrote:
> Hi Steev,
>
> That's interesting what you've done with Rockchip RK3399.
> I would like to reproduce your experiment on my RockPI 4B v1.3.
> Could you tell me how you to add this boost frequency that you have
> mentioned in some previous emails?
>
> I want to have similar setup to yours and I'll check all the subsystems
> involved in the decision making process for triggering this boost freq.
>
> Thank you for your support.
>
> Regards,
> Lukasz


Hi Lukasz,

It was actually something that Armbian had been doing as an overlay for 
their setup, and I thought, why does it need to be an overlay, when we 
could simply hide it behind turbo-mode so that if users want to 
overclock, they simply echo 1 and if it's unstable or cooling/power 
isn't enough, they can echo 0 or leave it off (boost defaults to off) - 
so that being said:

I apply this patch 
https://gitlab.com/kalilinux/build-scripts/kali-arm/-/blob/master/patches/pinebook-pro/pbp-5.14/rk3399-opp-overclock-2GHz-turbo-mode.patch 
which adds the 1.5GHz for little cores and 2GHz for the big to the 
rk3399 dtsi

To enable at boot time, I simply have "echo 1 > 
/sys/devices/system/cpu/cpufreq/boost" in my /etc/rc.local  And to 
disable, simply echo 0 in there (it defaults to 0 so it's off and most 
users won't know it exists.)

I'm pretty sure this is "abusing" turbo-mode, but it works well enough...

Hope that helps,

-- steev