linux-kernel - Re: [PATCH v9 0/5] Exynos: Simple QoS for exynos-bus using interconnect

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Message-ID: <a5fbc409-1af6-1c9a-f648-910baeb191d6@linaro.org>
Date:   Fri, 13 Nov 2020 11:02:51 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Chanwoo Choi <cw00.choi@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        inki.dae@...sung.com
Cc:     krzk@...nel.org, devicetree@...r.kernel.org, robh+dt@...nel.org,
        a.swigon@...sung.com, myungjoo.ham@...sung.com,
        sw0312.kim@...sung.com, b.zolnierkie@...sung.com,
        m.szyprowski@...sung.com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v9 0/5] Exynos: Simple QoS for exynos-bus using
 interconnect

On 11/13/20 11:07, Chanwoo Choi wrote:
> On 11/13/20 5:48 PM, Georgi Djakov wrote:
>> On 11/12/20 16:09, Sylwester Nawrocki wrote:
>>>
>>> This patchset adds interconnect API support for the Exynos SoC "samsung,
>>> exynos-bus" compatible devices, which already have their corresponding
>>> exynos-bus driver in the devfreq subsystem.  Complementing the devfreq
>>> driver with an interconnect functionality allows to ensure the QoS
>>> requirements of devices accessing the system memory (e.g. video processing
>>> devices) are fulfilled and allows to avoid issues like the one discussed
>>> in thread [1].
>>>
>>> This patch series adds implementation of the interconnect provider per each
>>> "samsung,exynos-bus" compatible DT node, with one interconnect node per
>>> provider.  The interconnect code which was previously added as a part of
>>> the devfreq driver has been converted to a separate platform driver.
>>> In the devfreq a corresponding virtual child platform device is registered.
>>> Integration of devfreq and interconnect frameworks is achieved through
>>> the PM QoS API.
>>>
>>> A sample interconnect consumer for exynos-mixer is added in patch 5/5,
>>> it is currently added only for exynos4412 and allows to address the
>>> mixer DMA underrun error issues [1].
>>
>> Good work Sylwester! Thank you and all the reviewers! What would be the merge
>> path for this patchset? Looks like there is no build dependency between patches.
>> Should i take just patches 2,3 or also patch 1? Chanwoo?
> 
> Hi Georgi,
> 
> If you take the patch 2,3, I'll apply patch 1,4 to devfreq.git.

Ok, sounds good! Thanks for clarifying!

BR,
Georgi