Hi Maxime, On Mon, Apr 20, 2020 at 10:45:47AM +0200, Maxime Ripard wrote: > 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! Please also apply "[PATCH v2 1/7] arm64: dts: allwinner: h6: Add clock to CPU cores" from the v2 series, otherwise cpufreq will not work. I can also send a missing patch adding the trip points, and cpu as a cooling device, that I linked in my other reply to this patch series afterwards, if Clément wants. regards, o. > Maxime
