[OpenWrt-Devel] Add support for kernel 4.19

[Daniel Engberg]

On 2018-12-09 15:57, Hauke Mehrtens wrote:
> Hi Daniel,
> 
> On 12/3/18 11:22 AM, Daniel Engberg wrote:
>> Hi Hauke!
>> 
>> First of all, great work and also thanks to the others who 
>> contributed!
> 
> Thanks for testing this Daniel,
> 
> The target code still needs some work, I only added this to test the
> generic code.
> 
>> I gave this a try on my Orange Pi PC (Allwinner H3) and it seems to 
>> run
>> fine overall. Ethernet TX is a bit slow (~65mbit using iperf3) while 
>> RX
>> does full line speed (~94mbit) more or less and USB also seems to work
>> as it should.
> 
> I used a Xunlong Orange Pi R1 (Allwinner H3) and got 94 Mbits/sec in RX
> and TX on both LAN ports (Allwinner MAC and Realtek USB MAC).
> 
>> CONFIG_REGULATOR_SY8106A=y should probably be added to the kernel 
>> config
>> as it's need to make cpufreq usable on this board.
> 
> Ok, I will add it.
> 
>> Looking at Armbian's repo we seem to lack a few kernel options which
>> might be useful in regards of thermal performance/power consumption.
>> 
>> CONFIG_ARM_CPUIDLE=y
>> CONFIG_CPU_IDLE=y
>> CONFIG_CPU_IDLE_MULTIPLE_DRIVERS=y
>> CONFIG_CPU_IDLE_GOV_LADDER=y
>> CONFIG_CPU_IDLE_GOV_MENU=y
>> CONFIG_DT_IDLE_STATES=y
> 
> I think there are still some pull requests open where people want to
> backport these features to 4.14, we should probably at least activate
> them in the kernel where they are available.
> 
>> For those using A64/H5 the Armbian repo contains quite a bit of 
>> patches
>> which might be worth looking at.
>> https://github.com/armbian/build/tree/master/patch/kernel/sunxi-dev
>> It should also be noted that they're using
>> https://github.com/megous/linux instead of mainline but it seems close
>> to mainline in general.
> 
> I think the non video parts are well supported in mainline by now, is
> there something particular interesting this this repository?
> 
> Hauke

Hi,

Allwinner H5 SoCs are known to run very hot and they do quite easily
overheat so it's probably a good idea to import cpufreq support 
otherwise
there should at least be a warning at boot that it'll most likely
overheat which in turn will cause a bad user experience.
This also seems to plague the A64 SoC to some extent.

There are also a few patches for nanopi boards which perhaps we should
import?

At least on my board any kind of cpufreq/power management seems to be
disabled by default which might be a good idea to change?

Best regards,
Daniel

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