linux-kernel - Re: [PATCH 0/6] devfreq: handle suspend/resume

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Message-ID: <36b5f798-e2ce-f23e-f469-98b5d385fcde@partner.samsung.com>
Date:   Thu, 22 Nov 2018 18:44:35 +0100
From:   Lukasz Luba <l.luba@...tner.samsung.com>
To:     Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org
Cc:     myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, rjw@...ysocki.net, len.brown@...el.com,
        pavel@....cz, gregkh@...uxfoundation.org, keescook@...omium.org,
        anton@...msg.org, ccross@...roid.com, tony.luck@...el.com,
        robh+dt@...nel.org, mark.rutland@....com, kgene@...nel.org,
        krzk@...nel.org, m.szyprowski@...sung.com, b.zolnierkie@...sung.com
Subject: Re: [PATCH 0/6] devfreq: handle suspend/resume

Hi Tobias,

On 11/22/18 6:24 PM, Tobias Jakobi wrote:
> Hey Lukasz,
> 
> just wanted to say hi and thanks for picking this up. Sadly my work no longer
> permits me to spend time working on the kernel.
Fingers crossed for your current work and maybe for come back to kernel
development in the future!
> 
> Anyway, great that this issue finally gets solved! :)
Thank you for your idea and development of these patches in v1 and v2.
This functionality is really needed.

Regards,
Lukasz

> 
> With best wishes,
> Tobias
> 
> 
> Lukasz Luba wrote:
>> Hi all,
>>
>> This patch set aims to address the issue with devfreq devices' frequency
>> during suspend/resume. It extends suspend/resume by calls to Devfreq
>> framework. In the devfreq framework there is a small refactoring to avoid
>> code duplication in changging frequency (patch 2) and there are extensions
>> for suspending devices.
>>
>> It has been tested on Odroid u3 with Exynos 4412.
>>
>> The patch set draws on Tobias Jakobi's work posted ~2 years ago, who tried
>> to solve issue with devfreq device's frequency during suspend/resume.
>> During the discussion on LKML some corner cases and comments appeared
>> related to the design. This patch set address them keeping in mind
>> suggestions from Chanwoo Choi.
>> Tobias's paches:
>> https://www.spinics.net/lists/linux-samsung-soc/msg56602.html
>>
>> Regards,
>> Lukasz Luba
>>
>> Lukasz Luba (6):
>>    devfreq: add basic fileds supporting suspend functionality
>>    devfreq: refactor set_target frequency function
>>    devfreq: add support for suspend/resume of a devfreq device
>>    devfreq: add devfreq_suspend/resume() functions
>>    drivers: power: suspend: call devfreq suspend/resume
>>    arm: dts: exynos4: set opp-suspend for DMC and leftbus
>>
>>   arch/arm/boot/dts/exynos4210.dtsi |   2 +
>>   arch/arm/boot/dts/exynos4412.dtsi |   2 +
>>   drivers/base/power/main.c         |   3 +
>>   drivers/devfreq/devfreq.c         | 159 ++++++++++++++++++++++++++++++--------
>>   include/linux/devfreq.h           |  11 +++
>>   5 files changed, 146 insertions(+), 31 deletions(-)
>>
> 
> 
>