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SubjectRe: [RFC/RFT 14/14] arm64: dts: meson-g12b-odroid-n2: enable DVFS
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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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