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Date: Wed, 22 Apr 2020 18:54:21 +0400
From: Christian Hewitt <christianshewitt@...il.com>
To: Tim Lewis <elatllat@...il.com>
Cc: Neil Armstrong <narmstrong@...libre.com>, khilman@...libre.com,
joy.cho@...dkernel.com, tobetter@...il.com,
linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
mark.rutland@....com, robh+dt@...nel.org
Subject: Re: [v2] arm64: dts: meson: odroid-n2: extend cpu opp-points
> On 19 Apr 2020, at 1:42 am, Tim Lewis <elatllat@...il.com> wrote:
>
> Odroid N2 has a large heatsink and HardKernel supports overclock
> through the addition to extra opp points in their official kernel
> sources [1]. Add these to the N2 dts only, as other S922X devices
> may not have suitable heatsinks.
>
> [1] https://github.com/hardkernel/linux/commit/f86cd9487c7483b2a05f448b9ebacf6bd5a2ad2f
> Signed-off-by: Tim Lewis <elatllat@...il.com>
Kodi is not a demanding workload, but the extra opp points are being used:
N2:~ # cat /sys/devices/system/cpu/cpufreq/policy0/stats/trans_table
From : To
: 100000 250000 500000 667000 1000000 1200000 1398000 1512000 1608000 1704000 1896000 1992000
100000: 0 20465 294 81 47 0 1 0 0 0 0 183
250000: 20388 0 161 52 59 0 0 0 1 0 1 169
500000: 199 256 0 9 47 1 2 0 0 0 0 57
667000: 177 50 10 0 284 1 1 0 0 0 0 136
1000000: 230 12 15 284 0 1 2 0 0 0 0 285
1200000: 0 0 0 1 0 0 0 0 0 1 0 2
1398000: 1 1 0 2 0 0 0 0 1 1 0 3
1512000: 0 0 0 0 0 0 0 0 0 1 0 2
1608000: 0 0 0 0 0 0 0 1 0 0 0 2
1704000: 0 1 0 0 0 0 1 0 0 0 0 2
1896000: 0 0 1 0 0 0 0 0 0 0 0 1
1992000: 76 47 90 230 392 0 2 2 1 1 1 0
N2:~ # cat /sys/devices/system/cpu/cpufreq/policy2/stats/trans_table
From : To
: 100000 250000 500000 667000 1000000 1200000 1398000 1512000 1608000 1704000 1800000 1908000
100000: 0 1698 130 76 87 0 0 0 1 0 1 199
250000: 1655 0 25 15 357 1 2 0 1 0 0 12
500000: 258 54 0 50102 30 3 1 0 0 0 1 32
667000: 267 151 49708 0 77 3 0 0 0 0 0 11
1000000: 3 5 525 15 0 3 2 0 1 1 0 6
1200000: 0 2 1 2 2 0 3 0 0 0 1 4
1398000: 1 0 1 1 4 0 0 1 1 0 2 2
1512000: 0 0 0 0 0 0 1 0 0 0 0 1
1608000: 1 0 0 1 0 1 0 0 0 0 0 3
1704000: 0 0 0 0 0 1 0 1 0 0 0 1
1800000: 0 0 1 1 0 0 1 0 1 0 0 1
1908000: 8 158 90 4 3 3 3 0 1 2 0 0
Board boots in under 4 seconds, Kodi home-screen in about 7 seconds. I haven’t seen the N2 rise over 44ºC.
I’ve also tested some S922X box devices (moving the change to meson-g12b-s922x.dtsi) and no obvious issues.
Tested-by: Christian Hewitt <christianshewitt@...il.com>
> ---
> .../boot/dts/amlogic/meson-g12b-odroid-n2.dts | 19 +++++++++++++++++++
> 1 file changed, 19 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 42f154057..6f32ac83f 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> @@ -260,6 +260,25 @@
> };
> };
> };
> +
> + cpu_opp_table_0: opp-table-0 {
> + opp-1992000000 {
> + opp-hz = /bits/ 64 <1992000000>;
> + opp-microvolt = <1001000>;
> + };
> + };
> +
> + cpub_opp_table_1: opp-table-1 {
> + opp-1800000000 {
> + opp-hz = /bits/ 64 <1800000000>;
> + opp-microvolt = <981000>;
> + };
> +
> + opp-1908000000 {
> + opp-hz = /bits/ 64 <1908000000>;
> + opp-microvolt = <1022000>;
> + };
> + };
> };
>
> &arb {
> --
> 2.17.1
>
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