linux-kernel - Re: [PATCH mvebu v3 00/10] Armada 37xx: Fix cpufreq changing base CPU speed to 800 MHz from 1000 MHz

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Date:   Fri, 12 Mar 2021 10:12:06 +0100
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     Pali Rohár <pali@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org,
        Marek Behún <kabel@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Tomasz Maciej Nowak <tmn505@...il.com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Andre Heider <a.heider@...il.com>,
        Vladimir Vid <vladimir.vid@...tura.hr>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Gérald Kerma <gerald@....net>,
        Konstantin Porotchkin <kostap@...vell.com>
Subject: Re: [PATCH mvebu v3 00/10] Armada 37xx: Fix cpufreq changing base
 CPU speed to 800 MHz from 1000 MHz

Hello Pali,

> Hello Gregory!
>
> Patches are the for almost two months and more people have tested them.
> They are marked with Fixed/CC-stable tags, they should go also into
> stable trees as they are fixing CPU scaling and instability issues.
>
> Are there any issues with these patches? If not, could you please merge
> them for upcoming Linux version?

Actually I am not the maintainer of the clk and cpufreq subsystems, so
the only thing I can apply is the device tree relative patch.

Gregory

>
> On Monday 22 February 2021 20:41:48 Pali Rohár wrote:
>> Hello!
>> 
>> This is third version of patches for Armada 37xx cpufreq driver which
>> fix CPU scaling with 1 GHz base frequency.
>> 
>> The only change in this third version is modified patch 04/10 with fixes
>> for 1.2 GHz variant of Espressobin. Minimal CPU voltage in L1 load for
>> 1.2 GHz variant was increased to 1.155V.
>> 
>> Patches are now rebased on top of the kernel version 5.11 with all
>> collected Acked-by/Tested-by lines and are available also in my git
>> tree in branch a3720-cpufreq-issues:
>> 
>> https://git.kernel.org/pub/scm/linux/kernel/git/pali/linux.git/log/?h=a3720-cpufreq-issues
>> 
>> If you have other Armada 3720 boards with 1.2 GHz CPU, including
>> Espressobin V7, let us know if it is working fine for you.
>> 
>> Marek & Pali
>> 
>> Marek Behún (3):
>>   arm64: dts: marvell: armada-37xx: add syscon compatible to NB clk node
>>   cpufreq: armada-37xx: Fix setting TBG parent for load levels
>>   clk: mvebu: armada-37xx-periph: remove .set_parent method for CPU PM
>>     clock
>> 
>> Pali Rohár (7):
>>   cpufreq: armada-37xx: Fix the AVS value for load L1
>>   clk: mvebu: armada-37xx-periph: Fix switching CPU freq from 250 Mhz to
>>     1 GHz
>>   clk: mvebu: armada-37xx-periph: Fix workaround for switching from L1
>>     to L0
>>   cpufreq: armada-37xx: Fix driver cleanup when registration failed
>>   cpufreq: armada-37xx: Fix determining base CPU frequency
>>   cpufreq: armada-37xx: Remove cur_frequency variable
>>   cpufreq: armada-37xx: Fix module unloading
>> 
>>  arch/arm64/boot/dts/marvell/armada-37xx.dtsi |   3 +-
>>  drivers/clk/mvebu/armada-37xx-periph.c       |  83 +++++++-------
>>  drivers/cpufreq/armada-37xx-cpufreq.c        | 111 +++++++++++++++----
>>  3 files changed, 135 insertions(+), 62 deletions(-)
>> 
>> -- 
>> 2.20.1
>> 

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com