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Message-id: <5B639C1C.40605@samsung.com>
Date: Fri, 03 Aug 2018 09:04:44 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Matthias Kaehlcke <mka@...omium.org>
Cc: MyungJoo Ham <myungjoo.ham@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Brian Norris <briannorris@...omium.org>,
Douglas Anderson <dianders@...omium.org>,
Enric Balletbo i Serra <enric.balletbo@...labora.com>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Viresh Kumar <viresh.kumar@...aro.org>,
Lee Jones <lee.jones@...aro.org>,
Benson Leung <bleung@...omium.org>,
Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v5 04/12] PM / devfreq: Add struct devfreq_policy
Hi Matthias,
On 2018년 07월 12일 17:38, Chanwoo Choi wrote:
> Hi Matthias,
>
> On 2018년 07월 07일 02:07, Matthias Kaehlcke wrote:
>> Hi,
>>
>> On Wed, Jul 04, 2018 at 11:51:30AM +0900, Chanwoo Choi wrote:
>>> Hi,
>>>
>>> On 2018년 07월 04일 08:46, Matthias Kaehlcke wrote:
>>>> Move variables related with devfreq policy changes from struct devfreq
>>>> to the new struct devfreq_policy and add a policy field to struct devfreq.
>>>>
>>>> The following variables are moved:
>>>>
>>>> df->min/max_freq => p->user.min/max_freq
>>>> df->scaling_min/max_freq => p->devinfo.min/max_freq
>>>> df->governor => p->governor
>>>> df->governor_name => p->governor_name
>>>>
>>>> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
>>>> Reviewed-by: Brian Norris <briannorris@...omium.org>
>>>> ---
>>>> Changes in v5:
>>>> - none
>>>>
>>>> Changes in v4:
>>>> - added 'Reviewed-by: Brian Norris <briannorris@...omium.org>' tag
>>>>
>>>> Changes in v3:
>>>> - none
>>>>
>>>> Changes in v2:
>>>> - performance, powersave and simpleondemand governors don't need changes
>>>> with "PM / devfreq: Don't adjust to user limits in governors"
>>>> - formatting fixes
>>>> ---
>>>> drivers/devfreq/devfreq.c | 137 ++++++++++++++++-------------
>>>> drivers/devfreq/governor_passive.c | 4 +-
>>>> include/linux/devfreq.h | 38 +++++---
>>
>>
>>>> 3 files changed, 103 insertions(+), 76 deletions(-)
>>>>
>>>
>>> (skip)
>>>
>>>>
>>>> diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c
>>>> index 3bc29acbd54e..e0987c749ec2 100644
>>>> --- a/drivers/devfreq/governor_passive.c
>>>> +++ b/drivers/devfreq/governor_passive.c
>>>> @@ -99,12 +99,12 @@ static int update_devfreq_passive(struct devfreq *devfreq, unsigned long freq)
>>>> {
>>>> int ret;
>>>>
>>>> - if (!devfreq->governor)
>>>> + if (!devfreq->policy.governor)
>>>> return -EINVAL;
>>>>
>>>> mutex_lock_nested(&devfreq->lock, SINGLE_DEPTH_NESTING);
>>>>
>>>> - ret = devfreq->governor->get_target_freq(devfreq, &freq);
>>>> + ret = devfreq->policy.governor->get_target_freq(devfreq, &freq);
>>>> if (ret < 0)
>>>> goto out;
>>>>
>>>> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
>>>> index 3aae5b3af87c..9bf23b976f4d 100644
>>>> --- a/include/linux/devfreq.h
>>>> +++ b/include/linux/devfreq.h
>>>> @@ -109,6 +109,30 @@ struct devfreq_dev_profile {
>>>> unsigned int max_state;
>>>> };
>>>>
>>>> +/**
>>>> + * struct devfreq_freq_limits - Devfreq frequency limits
>>>> + * @min_freq: minimum frequency
>>>> + * @max_freq: maximum frequency
>>>> + */
>>>> +struct devfreq_freq_limits {
>>>> + unsigned long min_freq;
>>>> + unsigned long max_freq;
>>>> +};
>>>> +
>>>> +/**
>>>> + * struct devfreq_policy - Devfreq policy
>>>> + * @user: frequency limits requested by the user
>>>> + * @devinfo: frequency limits of the device (available OPPs)
>>>> + * @governor: method how to choose frequency based on the usage.
>>>
>>> nitpick. remove '.' on the end of line.
>>
>> Ok
>>
>>>> + * @governor_name: devfreq governor name for use with this devfreq
>>>> + */
>>>> +struct devfreq_policy {
>>>> + struct devfreq_freq_limits user;
>>>> + struct devfreq_freq_limits devinfo;
>>>> + const struct devfreq_governor *governor;
>>>> + char governor_name[DEVFREQ_NAME_LEN];
>>>> +};
>>>> +
>>>> /**
>>>> * struct devfreq - Device devfreq structure
>>>> * @node: list node - contains the devices with devfreq that have been
>>>> @@ -117,8 +141,6 @@ struct devfreq_dev_profile {
>>>> * @dev: device registered by devfreq class. dev.parent is the device
>>>> * using devfreq.
>>>> * @profile: device-specific devfreq profile
>>>> - * @governor: method how to choose frequency based on the usage.
>>>> - * @governor_name: devfreq governor name for use with this devfreq
>>>> * @nb: notifier block used to notify devfreq object that it should
>>>> * reevaluate operable frequencies. Devfreq users may use
>>>> * devfreq.nb to the corresponding register notifier call chain.
>>>> @@ -126,10 +148,7 @@ struct devfreq_dev_profile {
>>>> * @previous_freq: previously configured frequency value.
>>>> * @data: Private data of the governor. The devfreq framework does not
>>>> * touch this.
>>>> - * @min_freq: Limit minimum frequency requested by user (0: none)
>>>> - * @max_freq: Limit maximum frequency requested by user (0: none)
>>>> - * @scaling_min_freq: Limit minimum frequency requested by OPP interface
>>>> - * @scaling_max_freq: Limit maximum frequency requested by OPP interface
>>>> + * @policy: Policy for frequency adjustments
>>>
>>> The devfreq_policy contains the range of frequency and governor information.
>>> But, this description focus on the frequency. You need to explain the more
>>> correct description of 'policy'.
>>
>> I wouldn't say that the focus is on 'frequency', but on 'frequency
>> adjustments', and the governor is an integral part of them.
>
> OK. I agree your original description.
>
>>
>> I can change it to "Policy for frequency adjustments, including
>> frequency limits and the governor" if you prefer. I'm open to other
>> suggestions.
>
> (snip)
>
When you resend next patch with my comment except for description of 'policy',
feel free to add my reviewed-by tag.
Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
--
Best Regards,
Chanwoo Choi
Samsung Electronics
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