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

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Date:   Sun,  5 Apr 2020 12:49:06 +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@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Clément Péron <peron.clem@...il.com>
Subject: [PATCH 0/7] Add support for Allwinner H6 DVFS

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.

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

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2.20.1