linux-kernel - RE: Re: [PATCH v3 4/5] drivers: power: suspend: call devfreq suspend/resume

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Message-ID: <20181221003305epcms1p756d76191d5f233c6e3238400d233b3c6@epcms1p7>
Date:   Fri, 21 Dec 2018 09:33:05 +0900
From:   MyungJoo Ham <myungjoo.ham@...sung.com>
To:     Lukasz Luba <l.luba@...tner.samsung.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     "tjakobi@...h.uni-bielefeld.de" <tjakobi@...h.uni-bielefeld.de>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "len.brown@...el.com" <len.brown@...el.com>,
        "pavel@....cz" <pavel@....cz>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "anton@...msg.org" <anton@...msg.org>,
        "ccross@...roid.com" <ccross@...roid.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "kgene@...nel.org" <kgene@...nel.org>,
        "krzk@...nel.org" <krzk@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: RE: Re: [PATCH v3 4/5] drivers: power: suspend: call devfreq
 suspend/resume

>On 2018-12-05 12:05, Lukasz Luba wrote:
>> Devfreq framework supports suspend of its devices.
>> Call the the devfreq interface and allow devfreq devices preserve/restore
>> their states during suspend/resume.
>>
>> Suggested-by: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>
>> Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
>> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>

This looks all good to me.

Acked-by: MyungJoo Ham <myungjoo.ham@...sung.com>

>> ---
>>  drivers/base/power/main.c | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
>> index a690fd4..0992e67 100644
>> --- a/drivers/base/power/main.c
>> +++ b/drivers/base/power/main.c
>> @@ -32,6 +32,7 @@
>>  #include <trace/events/power.h>
>>  #include <linux/cpufreq.h>
>>  #include <linux/cpuidle.h>
>> +#include <linux/devfreq.h>
>>  #include <linux/timer.h>
>>  
>>  #include "../base.h"
>> @@ -1078,6 +1079,7 @@ void dpm_resume(pm_message_t state)
>>  	dpm_show_time(starttime, state, 0, NULL);
>>  
>>  	cpufreq_resume();
>> +	devfreq_resume();
>>  	trace_suspend_resume(TPS("dpm_resume"), state.event, false);
>>  }
>>  
>> @@ -1852,6 +1854,7 @@ int dpm_suspend(pm_message_t state)
>>  	trace_suspend_resume(TPS("dpm_suspend"), state.event, true);
>>  	might_sleep();
>>  
>> +	devfreq_suspend();
>>  	cpufreq_suspend();
>>  
>>  	mutex_lock(&dpm_list_mtx);