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Message-ID: <949a5388-38ef-a170-a59e-3c54f0bab46a@baylibre.com>
Date: Wed, 22 Apr 2020 17:08:36 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: Christian Hewitt <christianshewitt@...il.com>,
Tim Lewis <elatllat@...il.com>
Cc: 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
Hi,
Could you add "[PATCH vX]" in the subject ?
On 22/04/2020 16:54, Christian Hewitt wrote:
>
>> 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
>>
>
I think it could be moved to all s922x devices since we have dvfs and thermal management enabled by default,
so other devices with inferior cooling will use lower OPPs automatically.
Neil
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