Hi Ondrej, Maxime, On Mon, 20 Apr 2020 at 12:39, Ondřej Jirman <megous@xxxxxxxxxx> wrote: > > 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. Indeed I have sent using the following cmd : "git send-email --to=XXXX HEAD~7" from the previous version. I should had do Instead: "git send-email --to=XXXX next/master " Sorry for that :( Clément > > regards, > o. > > > Maxime > >
