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

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Date:   Mon, 12 Aug 2019 17:28:26 +0200
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     Luca Weiss <luca@...tu.xyz>, LKML <linux-kernel@...r.kernel.org>,
        Brian Masney <masneyb@...tation.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 Mon, Jul 29, 2019 at 03:20:11PM +0530, Amit Kucheria wrote:
> On Mon, Jul 29, 2019 at 3:03 PM Luca Weiss <luca@...tu.xyz> wrote:
> >
> > 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
> 
> Niklas is working on refactoring some of the Krait code[1]. I'm not
> sure if he looked at 8974 directly as part of the refactor adding him
> here to get a better sense of the state of cpufreq on 8974.

Hello,

I took and cleaned up Sricharans commit
"cpufreq: qcom: Re-organise kryo cpufreq to use it for other nvmem based qcom socs"
from his Krait cpufreq series.

The commit renames and refactors the Kryo cpufreq driver.

This commit is now in linux-next:
https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git/commit/?h=cpufreq/arm/linux-next&id=106b976debd36b0e61847769f8edd71bfea56ed7


I also added Qualcomm A53 support to this driver.

However, Krait CPUs are different from both Kryo and Qualcomm A53,
so you will need to take Sricharans patch series and rebase it
on top of linux-next.

Kind regards,
Niklas

> 
> [1] https://lore.kernel.org/linux-arm-msm/20190726080823.xwhxagv5iuhudmic@vireshk-i7/T/#t