Messages in this thread | | | Subject | Re: [RFC/RFT 14/14] arm64: dts: meson-g12b-odroid-n2: enable DVFS | From | Neil Armstrong <> | Date | Mon, 24 Jun 2019 10:22:57 +0200 |
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On 20/06/2019 17:00, Neil Armstrong wrote: > Enable DVFS for the Odroid-N2 by setting the clock, OPP and supply > for each cores of each CPU clusters. > > The first cluster uses the "VDDCPU_B" power supply, and the second > cluster uses the "VDDCPU_A" power supply. > > Each power supply can achieve 0.73V to 1.01V using 2 distinct PWM > outputs clocked at 800KHz with an inverse duty-cycle. > > DVFS has been tested by running the arm64 cpuburn at [1] and cycling > between all the possible cpufreq translations of each cluster and > checking the final frequency using the clock-measurer, script at [2]. > > [1] https://github.com/ssvb/cpuburn-arm/blob/master/cpuburn-a53.S > [2] https://gist.github.com/superna9999/d4de964dbc0f84b7d527e1df2ddea25f > > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> > --- > .../boot/dts/amlogic/meson-g12b-odroid-n2.dts | 96 +++++++++++++++++++ > 1 file changed, 96 insertions(+) > > diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts > index c3e0735e6d9f..0db1547bfb5a 100644 > --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts > +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts > @@ -114,6 +114,44 @@
[...]
I just ran a 4days long test, leading to ~4 729 015 transitions.
Here are the cpufreq trans_table content :
Cortex-A53: From : To : 100000 250000 500000 666666 1000000 1200000 1398000 1512000 1608000 1704000 1896000 100000: 0 30975 20650 20649 20649 20649 20649 20649 20649 20649 20649 250000: 20650 0 30975 20649 20649 20649 20649 20649 20649 20649 20649 500000: 20650 20650 0 30973 20649 20648 20648 20648 20648 20648 20648 666666: 20649 20649 20649 0 30972 20648 20648 20648 20648 20648 20648 1000000: 20649 20649 20649 20648 0 30972 20648 20648 20648 20648 20648 1200000: 20649 20649 20648 20648 20648 0 30972 20648 20648 20648 20648 1398000: 20649 20649 20648 20648 20648 20648 0 30972 20648 20648 20648 1512000: 20649 20649 20648 20648 20648 20648 20648 0 30972 20648 20648 1608000: 20649 20649 20648 20648 20648 20648 20648 20648 0 30972 20648 1704000: 20649 20649 20648 20648 20648 20648 20648 20648 20648 0 30972 1896000: 30973 20649 20648 20648 20648 20648 20648 20648 20648 20648 0
Cortex-A73: From : To : 100000 250000 500000 666666 1000000 1200000 1398000 1512000 1704000 100000: 0 45964 30643 30643 30643 30642 30642 30642 30642 250000: 30643 0 45963 30642 30642 30642 30642 30642 30642 500000: 30643 30642 0 45963 30642 30642 30642 30642 30642 666666: 30643 30642 30642 0 45963 30642 30642 30642 30642 1000000: 30643 30642 30642 30642 0 45963 30642 30642 30642 1200000: 30642 30642 30642 30642 30642 0 45963 30642 30642 1398000: 30642 30642 30642 30642 30642 30642 0 45963 30642 1512000: 30642 30642 30642 30642 30642 30642 30642 0 45963 1704000: 45963 30642 30642 30642 30642 30642 30642 30642 0
Neil
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