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From: Neil Armstrong <narmstrong@baylibre.com>
To: jbrunet@baylibre.com, khilman@baylibre.com
Cc: martin.blumenstingl@googlemail.com,
	linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org
Subject: Re: [RFC/RFT 14/14] arm64: dts: meson-g12b-odroid-n2: enable DVFS
Date: Mon, 24 Jun 2019 10:22:57 +0200	[thread overview]
Message-ID: <789aa9dc-08d5-5d76-6efb-1365d83aad2e@baylibre.com> (raw)
In-Reply-To: <20190620150013.13462-15-narmstrong@baylibre.com>

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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      reply	other threads:[~2019-06-24  8:23 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-20 14:59 [RFC/RFT 00/14] arm64: g12a: add support for DVFS Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 01/14] pinctrl: meson-g12a: add pwm_a on GPIOE_2 pinmux Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 02/14] clk: core: introduce clk_hw_set_parent() Neil Armstrong
2019-06-25 20:32   ` Stephen Boyd
2019-06-26  8:22     ` Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 03/14] clk: meson: regmap: export regmap_div ops functions Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 04/14] clk: meson: eeclk: add setup callback Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 05/14] soc: amlogic: meson-clk-measure: protect measure with a mutex Neil Armstrong
2019-06-25 20:27   ` Stephen Boyd
2019-06-26  8:24     ` Neil Armstrong
2019-06-26 18:06       ` Stephen Boyd
2019-06-20 15:00 ` [RFC/RFT 06/14] soc: amlogic: meson-clk-measure: add G12B second cluster cpu clk Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 07/14] clk: meson: g12a: add notifiers to handle cpu clock change Neil Armstrong
2019-06-25 20:31   ` Stephen Boyd
2019-06-26  8:27     ` Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 08/14] clk: meson: g12a: expose CPUB clock ID for G12B Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 09/14] arm64: dts: move common G12A & G12B modes to meson-g12-common.dtsi Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 10/14] arm64: dts: meson-g12-common: add pwm_a on GPIOE_2 pinmux Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 11/14] arm64: dts: meson-g12a: add cpus OPP table Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 12/14] arm64: dts: meson-g12a: enable DVFS on G12A boards Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 13/14] arm64: dts: meson-g12b: add cpus OPP tables Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 14/14] arm64: dts: meson-g12b-odroid-n2: enable DVFS Neil Armstrong
2019-06-24  8:22   ` Neil Armstrong [this message]

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