linux-kernel - Re: [PATCH 0/7] Add support for Allwinner H6 DVFS

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Date:   Sun, 5 Apr 2020 17:30:21 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 0/7] Add support for Allwinner H6 DVFS

Hi,

On Sun, 5 Apr 2020 at 12:49, Clément Péron <peron.clem@...il.com> wrote:
>
> Hi Sunxi maintainers and members,
>
> Now that required drivers are merged we can contibute on DVFS support for
> Allwinner H6.
>
> This serie is based on Yangtao Li serie[0] and Megous works[1].
>
> Most of the OPP tables are taken from original vendor kernel[2].
> Plus there is a new CPU frequency @1.8GHz.
>
> I wrote a simple script to randomly set a frequency during a random time[3].
> With this script and using stress-ng during a day I didn't see any issue.
> Moreover I have tested specifically the 1.8GHz on my Beelink GS1, max thermal
> 80°C is reached after ~10min and then the SoC oscillates quickly between 1.5
> and 1.8GHz.
This result is wrong ignore it.

I will resend new one in next serie.

Regards,
Clement
>
> I also test that that offlining CPU0 and doing DVFS on other CPUs works.
> As CPU regulator is only set for CPU0.
>
> But maybe it doesn't cost much to set the regulator for all the CPUs?
>
> Jernej test the GPU devfreq on several H6 board particulary the Tanix TX6 which
> doesn't have a proper dedicated PMIC and doesn't had any trouble with it.
>
> Do you think I can enable GPU OPP for all H6 Boards?
>
> Also Yangtao Li enable DVFS for OrangePi and Pine64, as I can't test them I
> didn't reenable these boards. Please, let me know if you want me to add these
> boards in this serie.
>
> Thanks,
> Clément
>
> 0: https://patchwork.kernel.org/cover/10815117/
> 1: https://megous.com/git/linux/log/?h=ths-5.7
> 2: https://github.com/orangepi-xunlong/OrangePiH6_Linux4_9/blob/master/arch/arm64/boot/dts/sunxi/sun50iw6p1.dtsi#L345-L517
> 3: https://gist.github.com/clementperon/55a055dae3f13bbd14fb39c0069fe2e2
>
> Clément Péron (4):
>   arm64: dts: allwinner: h6: set thermal polling time
>   arm64: dts: allwinner: h6: Add GPU Operating Performance Points table
>   arm64: configs: Enable sun50i cpufreq nvmem
>   arm64: dts: allwinner: h6: Enable CPU and GPU opp tables for Beelink
>     GS1
>
> Ondrej Jirman (2):
>   arm64: dts: allwinner: h6: Add thermal trip points/cooling map
>   arm64: dts: allwinner: h6: Add CPU Operating Performance Points table
>
> Yangtao Li (1):
>   arm64: dts: allwinner: h6: Add clock to CPU cores
>
>  .../dts/allwinner/sun50i-h6-beelink-gs1.dts   |  10 +-
>  .../boot/dts/allwinner/sun50i-h6-cpu-opp.dtsi | 103 ++++++++++++++++++
>  .../boot/dts/allwinner/sun50i-h6-gpu-opp.dtsi |  74 +++++++++++++
>  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi  |  44 +++++++-
>  arch/arm64/configs/defconfig                  |   1 +
>  5 files changed, 226 insertions(+), 6 deletions(-)
>  create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-h6-cpu-opp.dtsi
>  create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-h6-gpu-opp.dtsi
>
> --
> 2.20.1
>