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Message-ID: <CA+Z25wXinqreVQcJVsF+bXiwNKPii=onMkTB0Scrk6TU6EajNg@mail.gmail.com>
Date: Mon, 8 Oct 2012 14:12:39 +0530
From: Rajagopal Venkat <rajagopal.venkat@...aro.org>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: myungjoo.ham@...sung.com, mturquette@...aro.org,
kyungmin.park@...sung.com, patches@...aro.org,
linaro-dev@...ts.linaro.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/3] devfreq: Add suspend and resume apis
On 8 October 2012 03:31, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Thursday 04 of October 2012 14:58:33 Rajagopal Venkat wrote:
>> Add devfreq suspend/resume apis for devfreq users. This patch
>> supports suspend and resume of devfreq load monitoring, required
>> for devices which can idle.
>>
>> Signed-off-by: Rajagopal Venkat <rajagopal.venkat@...aro.org>
>> Acked-by: MyungJoo Ham <myungjoo.ham@...sung.com>
>
> Well, I wonder if this may be tied in to the runtime PM framework, so that,
> for example, pm_runtime_suspend() will automatically suspend devfreq on
> success (and the runtime resume of the device will resume devfreq)?
That's a good idea. If you agree, we can handle this as separate patch on
top this patchset.
>
> Rafael
>
>
>> ---
>> drivers/devfreq/devfreq.c | 28 ++++++++++++++++++++++++++++
>> drivers/devfreq/governor.h | 2 ++
>> drivers/devfreq/governor_simpleondemand.c | 9 +++++++++
>> include/linux/devfreq.h | 12 ++++++++++++
>> 4 files changed, 51 insertions(+)
>>
>> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
>> index 41a4099..63e075e 100644
>> --- a/drivers/devfreq/devfreq.c
>> +++ b/drivers/devfreq/devfreq.c
>> @@ -428,6 +428,34 @@ int devfreq_remove_device(struct devfreq *devfreq)
>> }
>> EXPORT_SYMBOL(devfreq_remove_device);
>>
>> +/**
>> + * devfreq_suspend_device() - Suspend devfreq of a device.
>> + * @devfreq the devfreq instance to be suspended
>> + */
>> +int devfreq_suspend_device(struct devfreq *devfreq)
>> +{
>> + if (!devfreq)
>> + return -EINVAL;
>> +
>> + return devfreq->governor->event_handler(devfreq,
>> + DEVFREQ_GOV_SUSPEND, NULL);
>> +}
>> +EXPORT_SYMBOL(devfreq_suspend_device);
>> +
>> +/**
>> + * devfreq_resume_device() - Resume devfreq of a device.
>> + * @devfreq the devfreq instance to be resumed
>> + */
>> +int devfreq_resume_device(struct devfreq *devfreq)
>> +{
>> + if (!devfreq)
>> + return -EINVAL;
>> +
>> + return devfreq->governor->event_handler(devfreq,
>> + DEVFREQ_GOV_RESUME, NULL);
>> +}
>> +EXPORT_SYMBOL(devfreq_resume_device);
>> +
>> static ssize_t show_governor(struct device *dev,
>> struct device_attribute *attr, char *buf)
>> {
>> diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
>> index bb3aff3..26432ac 100644
>> --- a/drivers/devfreq/governor.h
>> +++ b/drivers/devfreq/governor.h
>> @@ -22,6 +22,8 @@
>> #define DEVFREQ_GOV_START 0x1
>> #define DEVFREQ_GOV_STOP 0x2
>> #define DEVFREQ_GOV_INTERVAL 0x3
>> +#define DEVFREQ_GOV_SUSPEND 0x4
>> +#define DEVFREQ_GOV_RESUME 0x5
>>
>> /* Caution: devfreq->lock must be locked before calling update_devfreq */
>> extern int update_devfreq(struct devfreq *devfreq);
>> diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c
>> index cf94218..a8ba78c 100644
>> --- a/drivers/devfreq/governor_simpleondemand.c
>> +++ b/drivers/devfreq/governor_simpleondemand.c
>> @@ -104,6 +104,15 @@ int devfreq_simple_ondemand_handler(struct devfreq *devfreq,
>> case DEVFREQ_GOV_INTERVAL:
>> devfreq_interval_update(devfreq, (unsigned int *)data);
>> break;
>> +
>> + case DEVFREQ_GOV_SUSPEND:
>> + devfreq_monitor_suspend(devfreq);
>> + break;
>> +
>> + case DEVFREQ_GOV_RESUME:
>> + devfreq_monitor_resume(devfreq);
>> + break;
>> +
>> default:
>> break;
>> }
>> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
>> index 9cdffde..ee243a3 100644
>> --- a/include/linux/devfreq.h
>> +++ b/include/linux/devfreq.h
>> @@ -158,6 +158,8 @@ extern struct devfreq *devfreq_add_device(struct device *dev,
>> const struct devfreq_governor *governor,
>> void *data);
>> extern int devfreq_remove_device(struct devfreq *devfreq);
>> +extern int devfreq_suspend_device(struct devfreq *devfreq);
>> +extern int devfreq_resume_device(struct devfreq *devfreq);
>>
>> /* Helper functions for devfreq user device driver with OPP. */
>> extern struct opp *devfreq_recommended_opp(struct device *dev,
>> @@ -211,6 +213,16 @@ static int devfreq_remove_device(struct devfreq *devfreq)
>> return 0;
>> }
>>
>> +static int devfreq_suspend_device(struct devfreq *devfreq)
>> +{
>> + return 0;
>> +}
>> +
>> +static int devfreq_resume_device(struct devfreq *devfreq)
>> +{
>> + return 0;
>> +}
>> +
>> static struct opp *devfreq_recommended_opp(struct device *dev,
>> unsigned long *freq, u32 flags)
>> {
>>
> --
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.
--
Regards,
Rajagopal
--
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