linux-kernel - Re: [PATCH 00/15] thermal: qcom: tsens: Add interrupt support

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Date:   Mon, 29 Jul 2019 11:32:52 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     linux-kernel@...r.kernel.org
Cc:     Brian Masney <masneyb@...tation.org>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Andy Gross <andy.gross@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 00/15] thermal: qcom: tsens: Add interrupt support

On Montag, 29. Juli 2019 11:07:35 CEST Brian Masney wrote:
> On Sat, Jul 27, 2019 at 12:58:54PM +0530, Amit Kucheria wrote:
> > On Fri, Jul 26, 2019 at 4:59 PM Brian Masney <masneyb@...tation.org> wrote:
> > > On Fri, Jul 26, 2019 at 04:40:16PM +0530, Amit Kucheria wrote:
> > > > How well does cpufreq work on 8974? I haven't looked at it yet but
> > > > we'll need it for thermal throttling.
> > > 
> > > I'm not sure how to tell if the frequency is dynamically changed during
> > > runtime on arm. x86-64 shows this information in /proc/cpuinfo. Here's
> > 
> > > the /proc/cpuinfo on the Nexus 5:
> > Nah. /proc/cpuinfo won't show what we need.
> > 
> > Try the following:
> > 
> > $ grep "" /sys/devices/system/cpu/cpufreq/policy?/*
> > 
> > More specifically, the following files have the information you need.
> > Run watch -n1 on them.
> > 
> > $ grep "" /sys/devices/system/cpu/cpufreq/policy?/scaling_*_freq
> 
> There's no cpufreq directory on msm8974:
> 
>     # ls -1 /sys/devices/system/cpu/
>     cpu0
>     cpu1
>     cpu2
>     cpu3
>     cpuidle
>     hotplug
>     isolated
>     kernel_max
>     modalias
>     offline
>     online
>     possible
>     power
>     present
>     smt
>     uevent
> 
> I'm using qcom_defconfig.
> 
> Brian

Hi Brian,
cpufreq isn't supported on msm8974 yet.
I have these patches [0] in my tree but I'm not sure they work correctly, but I haven't tested much with them. Feel free to try them on hammerhead.

Luca

[0] https://github.com/z3ntu/linux/compare/b0917f53ada0e929896a094b451219cd8091366e...6459ca6aff498c9d12acd35709b4903effc4c3f8

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