linux-kernel - Re: brocken devfreq simple

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Date:   Mon, 29 Jun 2020 12:34:21 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Kamil Konieczny <k.konieczny@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Willy Wolff <willy.mh.wolff.ml@...il.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Kukjin Kim <kgene@...nel.org>, linux-pm@...r.kernel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: brocken devfreq simple_ondemand for Odroid XU3/4?



On 6/26/20 12:22 PM, Bartlomiej Zolnierkiewicz wrote:
> 
> On 6/25/20 2:12 PM, Kamil Konieczny wrote:
>> On 25.06.2020 14:02, Lukasz Luba wrote:
>>>
>>>
>>> On 6/25/20 12:30 PM, Kamil Konieczny wrote:

[snip]

>>>
>>> Kamil do you have plans to refresh and push your next version of the
>>> workqueue solution?
>>
>> I do not, as Bartek takes over my work,
>> +CC Bartek
> 
> Hi Lukasz,

Hi Bartek,

> 
> As you remember in January Chanwoo has proposed another idea (to allow
> selecting workqueue type by devfreq device driver):
> 
> "I'm developing the RFC patch and then I'll send it as soon as possible."
> (https://lore.kernel.org/linux-pm/6107fa2b-81ad-060d-89a2-d8941ac4d17e@samsung.com/)
> 
> "After posting my suggestion, we can discuss it"
> (https://lore.kernel.org/linux-pm/f5c5cd64-b72c-2802-f6ea-ab3d28483260@samsung.com/)
> 
> so we have been waiting on the patch to be posted..
> 
> Similarly we have been waiting on (any) feedback for exynos-bus/nocp
> fixes for Exynos5422 support (which have been posted by Kamil also in
> January):
> 
> https://lore.kernel.org/linux-pm/8f82d8d5-927b-afb4-272f-45c16b5a23b9@samsung.com/
> 
> Considering the above and how hard it has been to push the changes
> through review/merge process last year we are near giving up when it
> comes to upstream devfreq contributions. Sylwester is still working on
> exynos-bus & interconnect integration (continuation of Artur Swigon's
> work from last year) & related issues (IRQ support for PPMU)  but
> I'm seriously considering putting it all on-hold..

Thank you for detailed explanation and update. I see. Anyway, if you or
Sylwester need some help with this devfreq workqueue, I offer my time
as a reviewer&tester.

The more generic solution you propose, the better for all platforms.

Regards,
Lukasz

> 
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
>