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: <7ee7e7bb-6c0d-dfd1-f00d-a718c06d7479@samsung.com>
Date:   Tue, 3 Nov 2020 11:22:35 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Dmitry Osipenko <digetx@...il.com>, 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>,
        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

On 11/3/20 5:08 AM, Dmitry Osipenko wrote:
> 01.11.2020 17:12, Dmitry Osipenko пишет:
> ...
>> 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.
> 
> I took a brief look at the delayed timer and I think the deferrable
> timer should be more a preferred option because this devfreq drive is
> more an assistance for the optimal bandwidth selection and it will be
> more preferred to keep system idling whenever possible.
> 
> My primary concern is the initial performance lag in a case of
> multimedia applications. But this will be resolved by hooking up
> performance voting to all drivers, once we will get around to it.

OK. You can choice the type of timer on both probe
and via sysfs file on the runtime.


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics