linux-kernel - Re: [PATCH 06/12] PM / devfreq: Add cpu based scaling support to passive

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Date:   Wed, 3 Jun 2020 13:12:54 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     "andrew-sh.cheng" <andrew-sh.cheng@...iatek.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        srv_heupstream@...iatek.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        Sibi Sankar <sibis@...eaurora.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 06/12] PM / devfreq: Add cpu based scaling support to
 passive_governor

Hi Andrew-sh.Cheng,

On 6/2/20 9:23 PM, andrew-sh.cheng wrote:
> On Thu, 2020-05-28 at 16:17 +0900, Chanwoo Choi wrote:
>> Hi Andrew-sh.Cheng,
>>
>> The exynos-bus.c used the passive governor.
>> Even if don't make the problem because DEVFREQ_PARENT_DEV is zero,
>> you need to initialize the parent_type with DEVFREQ_PARENT_DEV as following:
>>
>> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
>> index 8fa8eb541373..1c71c47bc2ac 100644
>> --- a/drivers/devfreq/exynos-bus.c
>> +++ b/drivers/devfreq/exynos-bus.c
>> @@ -369,6 +369,7 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
>>                 return -ENOMEM;
>>  
>>         passive_data->parent = parent_devfreq;
>> +       passive_data->parent_type = DEVFREQ_PARENT_DEV;
>>  
>>         /* Add devfreq device for exynos bus with passive governor */
>>         bus->devfreq = devm_devfreq_add_device(dev, profile, DEVFREQ_GOV_PASSIVE,
> Hi Chanwoo Choi,
> Do you just remind me to initialize it to DEVFREQ_PARENT_DEV whn use
> this governor?

Yes. This change was not included in this patchset.

> I will do it and thank you for reminding.

Thanks.

(snip)


And, this patchset doesn't include the dt-binding example
and any real example in devicetree. If possible, I recommend
you better to update dt-binding document with example.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics