Hi Clement, On Mon, Apr 13, 2020 at 03:37:19PM +0200, Clément Péron wrote: > On Mon, 6 Apr 2020 at 11:07, Clément Péron <peron.clem@xxxxxxxxx> wrote: > > On Mon, 6 Apr 2020 at 10:10, Maxime Ripard <maxime@xxxxxxxxxx> wrote: > > > > > > Hi, > > > > > > On Sun, Apr 05, 2020 at 07:35:54PM +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 is a 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]. > > > > > > If you ever need to do that ever again, cpufreq-ljt-stress-test (found > > > here https://github.com/ssvb/cpuburn-arm) has proven to be very > > > reliable to detect cpufreq related issues. stress-ng might not be > > > enough since the (at least older) Allwinner SoCs tend to create cache > > > corruption when undervolted, and that might not be unnoticed by > > > stress-ng but will be catched by cpufreq-ljt-stress-test. > > The test seems good (see result below) : > > # cpufreq-ljt-stress-test > Creating './whitenoise-1920x1080.jpg' ... done > CPU stress test, which is doing JPEG decoding by libjpeg-turbo > at different cpufreq operating points. > > Testing CPU 0 > 1800 MHz ............................................................ OK > 1704 MHz ............................................................ OK > 1608 MHz ............................................................ OK > 1488 MHz ............................................................ OK > 1320 MHz ............................................................ OK > 1080 MHz ............................................................ OK > 888 MHz ............................................................ OK > 816 MHz ............................................................ OK > 720 MHz ............................................................ OK > 480 MHz ............................................................ OK > > Testing CPU 1 > 1800 MHz ............................................................ OK > 1704 MHz ............................................................ OK > 1608 MHz ............................................................ OK > 1488 MHz ............................................................ OK > 1320 MHz ............................................................ OK > 1080 MHz ............................................................ OK > 888 MHz ............................................................ OK > 816 MHz ............................................................ OK > 720 MHz ............................................................ OK > 480 MHz ............................................................ OK > > Testing CPU 2 > 1800 MHz ............................................................ OK > 1704 MHz ............................................................ OK > 1608 MHz ............................................................ OK > 1488 MHz ............................................................ OK > 1320 MHz ............................................................ OK > 1080 MHz ............................................................ OK > 888 MHz ............................................................ OK > 816 MHz ............................................................ OK > 720 MHz ............................................................ OK > 480 MHz ............................................................ OK > > Testing CPU 3 > 1800 MHz ............................................................ OK > 1704 MHz ............................................................ OK > 1608 MHz ............................................................ OK > 1488 MHz ............................................................ OK > 1320 MHz ............................................................ OK > 1080 MHz ............................................................ OK > 888 MHz ............................................................ OK > 816 MHz ............................................................ OK > 720 MHz ............................................................ OK > 480 MHz ............................................................ OK > > Overall result : PASSED Awesome, thanks for taking the time to do it :) Maxime
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