linux-kernel - Re: [PATCH v6 49/52] PM / devfreq: tegra20: Convert to EMC_STAT driver, support interconnect and device-tree

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Message-ID: <0ffa84f6-625e-807c-e9af-7a67f0fe48e7@gmail.com>
Date:   Sun, 1 Nov 2020 17:12:41 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     cwchoi00@...il.com
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Viresh Kumar <vireshk@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-tegra@...r.kernel.org,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6 49/52] PM / devfreq: tegra20: Convert to EMC_STAT
 driver, support interconnect and device-tree

01.11.2020 16:31, Chanwoo Choi пишет:
> Hi Dmitry,
> 
> This patch contains the three features as following:
> 1. Use interconnect interface for controlling the clock instead of
> controlling it direclty
> 2. Use EMC_STAT instead of IMC_STAT
> 3. Change polling_interval and upthreshold for more fast responsiveness
> 
> I think you need to make the separate patches for each role.
> But, if it is difficult or not proper to split out 1,2 roles, you can
> make two patches for 1,2 and 3 roles.

Hello Chanwoo,

We will probably move the Tegra20 EMC_STAT devfreq driver into the
memory driver and remove the older IMC_STAT driver in v7, like it was
suggested by Thierry Reding. This will be a much less invasive code change.

> Also, if you want to get more responsiveness, you could use delayed timer
> instead of deferrable timer by editing the devfreq_dev_profile structure.

Thanks, I'll try the deferrable timer.