Hi, On Sun, Apr 19, 2020 at 03:50:04PM +0200, Clément Péron wrote: > 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 Ondřej Jirman work[1]. > > Most of the OPP tables are taken from original vendor kernel[2]. > Plus there are new CPU frequencies at 1.6GHz, 1.7GHz and 1.8GHz. > > I wrote a simple script to randomly set a frequency during > a random time[3]. This script is quite stressfull and set some high > frequency without checking temperature. This can result on behavior > that whould not occurs with the real cpufreq framework. > As Maxime point out I also tested with cpufreq-ljt-stress-test > (found here https://github.com/ssvb/cpuburn-arm). > This script doesn't trigger any issue. > I also test that that offlining CPU0 and doing DVFS on other CPUs > works. As CPU regulator is only set for CPU0. > > The GPU devfreq was drop as the regulator is still not properly > drive by panfrost driver[4]. > I will re-introduce it later. > > Ondřej Jirman has an Orange Pi 3, Jernej has a PineH64 and a Tanix > TX6 boards and I have a Beelink GS1 board so I have enable these > boards. But CPU Devfreq is really touchy has it depends on: > board design, SoC speed_grade and environement which can affect > thermal cooling and have different behavior for different user. > > If people can test this serie and give feedback, I will try to > introduce this in LibreElec tree, so LE community can test it. Applied all of them, thanks! Maxime
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