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From: Chanwoo Choi <cw00.choi@samsung.com>
To: Matthias Kaehlcke <mka@chromium.org>,
	MyungJoo Ham <myungjoo.ham@samsung.com>,
	Kyungmin Park <kyungmin.park@samsung.com>
Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Brian Norris <briannorris@chromium.org>,
	Douglas Anderson <dianders@chromium.org>
Subject: Re: [PATCH] PM / devfreq: Remove redundant frequency adjustment from governors
Date: Fri, 18 May 2018 08:18:14 +0900	[thread overview]
Message-ID: <5AFE0DB6.1060801@samsung.com> (raw)
In-Reply-To: <20180517224126.GP19594@google.com>

On 2018년 05월 18일 07:41, Matthias Kaehlcke wrote:
> On Wed, May 16, 2018 at 02:10:51PM -0700, Matthias Kaehlcke wrote:
>> The performance, powersave, simpleondemand and userspace governors
>> determine a target frequency and then adjust it according to the
>> df->min/max_freq limits that might have been set by user space. This
>> adjustment is redundant, it is done in update_devfreq() for any
>> governor, right after governor->get_target_freq().
>>
>> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
>> ---
>>  drivers/devfreq/governor_performance.c    | 10 ++--------
>>  drivers/devfreq/governor_powersave.c      |  5 -----
>>  drivers/devfreq/governor_simpleondemand.c |  7 +------
>>  drivers/devfreq/governor_userspace.c      | 16 ++++------------
>>  4 files changed, 7 insertions(+), 31 deletions(-)
>>
>> diff --git a/drivers/devfreq/governor_performance.c b/drivers/devfreq/governor_performance.c
>> index 4d23ecfbd948..31ee30622c00 100644
>> --- a/drivers/devfreq/governor_performance.c
>> +++ b/drivers/devfreq/governor_performance.c
>> @@ -16,14 +16,8 @@
>>  static int devfreq_performance_func(struct devfreq *df,
>>  				    unsigned long *freq)
>>  {
>> -	/*
>> -	 * target callback should be able to get floor value as
>> -	 * said in devfreq.h
>> -	 */
>> -	if (!df->max_freq)
>> -		*freq = UINT_MAX;
>> -	else
>> -		*freq = df->max_freq;
>> +	*freq = UINT_MAX;
>> +
>>  	return 0;
>>  }
> 
> For the record, the frequency adjustment in update_devfreq() is
> currently broken for df->max_freq == 0:
> 
> https://patchwork.kernel.org/patch/10407827/

Why don't you send patch set? It is very difficult to track
the history and a correlation between patches. Usually, if patches
have the dependency between patches, send the patch set with cover-letter.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics

      reply	other threads:[~2018-05-17 23:18 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20180516211119epcas2p4370ceb0c9d959bd1441fa71493a9b0e0@epcas2p4.samsung.com>
2018-05-16 21:10 ` Matthias Kaehlcke
2018-05-17  1:44   ` Chanwoo Choi
2018-05-17 15:47     ` Matthias Kaehlcke
2018-05-17 23:15       ` Chanwoo Choi
2018-05-18 17:38         ` Matthias Kaehlcke
2018-05-17 22:41   ` Matthias Kaehlcke
2018-05-17 23:18     ` Chanwoo Choi [this message]

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