Patchwork [v2,3/5] devfreq: add devfreq_suspend/resume() functions

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Submitter Lukasz Luba
Date Dec. 3, 2018, 2:31 p.m.
Message ID <1543847475-7600-4-git-send-email-l.luba@partner.samsung.com>
Download mbox | patch
Permalink /patch/670659/
State New
Headers show

Comments

Lukasz Luba - Dec. 3, 2018, 2:31 p.m.
This patch adds implementation for global suspend/resume for
devfreq framework. System suspend will next use these functions.

The patch is based on earlier work by Tobias Jakobi.

Suggested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
---
 drivers/devfreq/devfreq.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/devfreq.h   |  6 ++++++
 2 files changed, 48 insertions(+)
Chanwoo Choi - Dec. 4, 2018, 6:19 a.m.
Hi Lukasz,

On 2018년 12월 03일 23:31, Lukasz Luba wrote:
> This patch adds implementation for global suspend/resume for
> devfreq framework. System suspend will next use these functions.
> 
> The patch is based on earlier work by Tobias Jakobi.

Please remove it from each patch description.

> 
> Suggested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
> Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
> ---
>  drivers/devfreq/devfreq.c | 42 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/devfreq.h   |  6 ++++++
>  2 files changed, 48 insertions(+)
> 
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 36bed24..7d60423 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -935,6 +935,48 @@ int devfreq_resume_device(struct devfreq *devfreq)
>  EXPORT_SYMBOL(devfreq_resume_device);
>  
>  /**
> + * devfreq_suspend() - Suspend devfreq governors and devices
> + *
> + * Called during system wide Suspend/Hibernate cycles for suspending governors
> + * and devices preserving the state for resume. On some platforms the devfreq
> + * device must have precise state (frequency) after resume in order to provide
> + * fully operating setup.
> + */
> +void devfreq_suspend(void)
> +{
> +	struct devfreq *devfreq;
> +	int ret;
> +
> +	mutex_lock(&devfreq_list_lock);
> +	list_for_each_entry(devfreq, &devfreq_list, node) {
> +		ret = devfreq_suspend_device(devfreq);
> +		if (ret)
> +			dev_warn(&devfreq->dev, "device suspend failed\n");

When I checked the cpufreq_suspend(), cpufreq_suspend() prints message as 'err' level.
I think that dev_err is more proper than dev_warn.

I'm not sure what is more correct log.
But, 'devfreq->dev' device has the separate suspend/resume function.
So, I think that devfreq_suspend() should print error log containing
that it is error by devfreq framework.

"device suspend failed"
-> "failed to suspend devfreq device"

> +	}
> +	mutex_unlock(&devfreq_list_lock);
> +}
> +
> +/**
> + * devfreq_resume() - Resume devfreq governors and devices
> + *
> + * Called during system wide Suspend/Hibernate cycle for resuming governors and
> + * devices that are suspended with devfreq_suspend().
> + */
> +void devfreq_resume(void)
> +{
> +	struct devfreq *devfreq;
> +	int ret;
> +
> +	mutex_lock(&devfreq_list_lock);
> +	list_for_each_entry(devfreq, &devfreq_list, node) {
> +		ret = devfreq_resume_device(devfreq);
> +		if (ret)
> +			dev_warn(&devfreq->dev, "device resume failed\n");

ditto.

"device resume failed"
-> "failed to resume devfreq device"


> +	}
> +	mutex_unlock(&devfreq_list_lock);
> +}
> +
> +/**
>   * devfreq_add_governor() - Add devfreq governor
>   * @governor:	the devfreq governor to be added
>   */
> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
> index d985199..fbffa74 100644
> --- a/include/linux/devfreq.h
> +++ b/include/linux/devfreq.h
> @@ -205,6 +205,9 @@ extern void devm_devfreq_remove_device(struct device *dev,
>  extern int devfreq_suspend_device(struct devfreq *devfreq);
>  extern int devfreq_resume_device(struct devfreq *devfreq);
>  
> +extern void devfreq_suspend(void);
> +extern void devfreq_resume(void);
> +
>  /**
>   * update_devfreq() - Reevaluate the device and configure frequency
>   * @devfreq:	the devfreq device
> @@ -331,6 +334,9 @@ static inline int devfreq_resume_device(struct devfreq *devfreq)
>  	return 0;
>  }
>  
> +static inline void devfreq_suspend(void) {}
> +static inline void devfreq_resume(void) {}
> +
>  static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
>  					   unsigned long *freq, u32 flags)
>  {
>
Lukasz Luba - Dec. 4, 2018, 9:44 a.m.
Hi Chanwoo,

On 12/4/18 7:19 AM, Chanwoo Choi wrote:
> Hi Lukasz,
> 
> On 2018년 12월 03일 23:31, Lukasz Luba wrote:
>> This patch adds implementation for global suspend/resume for
>> devfreq framework. System suspend will next use these functions.
>>
>> The patch is based on earlier work by Tobias Jakobi.
> 
> Please remove it from each patch description.
OK
> 
>>
>> Suggested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
>> Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
>> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
>> ---
>>   drivers/devfreq/devfreq.c | 42 ++++++++++++++++++++++++++++++++++++++++++
>>   include/linux/devfreq.h   |  6 ++++++
>>   2 files changed, 48 insertions(+)
>>
>> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
>> index 36bed24..7d60423 100644
>> --- a/drivers/devfreq/devfreq.c
>> +++ b/drivers/devfreq/devfreq.c
>> @@ -935,6 +935,48 @@ int devfreq_resume_device(struct devfreq *devfreq)
>>   EXPORT_SYMBOL(devfreq_resume_device);
>>   
>>   /**
>> + * devfreq_suspend() - Suspend devfreq governors and devices
>> + *
>> + * Called during system wide Suspend/Hibernate cycles for suspending governors
>> + * and devices preserving the state for resume. On some platforms the devfreq
>> + * device must have precise state (frequency) after resume in order to provide
>> + * fully operating setup.
>> + */
>> +void devfreq_suspend(void)
>> +{
>> +	struct devfreq *devfreq;
>> +	int ret;
>> +
>> +	mutex_lock(&devfreq_list_lock);
>> +	list_for_each_entry(devfreq, &devfreq_list, node) {
>> +		ret = devfreq_suspend_device(devfreq);
>> +		if (ret)
>> +			dev_warn(&devfreq->dev, "device suspend failed\n");
> 
> When I checked the cpufreq_suspend(), cpufreq_suspend() prints message as 'err' level.
> I think that dev_err is more proper than dev_warn.
> 
> I'm not sure what is more correct log.
> But, 'devfreq->dev' device has the separate suspend/resume function.
> So, I think that devfreq_suspend() should print error log containing
> that it is error by devfreq framework.
> 
> "device suspend failed"
> -> "failed to suspend devfreq device"
OK, changed in next v3 patch set.
> 
>> +	}
>> +	mutex_unlock(&devfreq_list_lock);
>> +}
>> +
>> +/**
>> + * devfreq_resume() - Resume devfreq governors and devices
>> + *
>> + * Called during system wide Suspend/Hibernate cycle for resuming governors and
>> + * devices that are suspended with devfreq_suspend().
>> + */
>> +void devfreq_resume(void)
>> +{
>> +	struct devfreq *devfreq;
>> +	int ret;
>> +
>> +	mutex_lock(&devfreq_list_lock);
>> +	list_for_each_entry(devfreq, &devfreq_list, node) {
>> +		ret = devfreq_resume_device(devfreq);
>> +		if (ret)
>> +			dev_warn(&devfreq->dev, "device resume failed\n");
> 
> ditto.
> 
> "device resume failed"
> -> "failed to resume devfreq device"
> 
ACK

Regards,
Lukasz
> 
>> +	}
>> +	mutex_unlock(&devfreq_list_lock);
>> +}
>> +
>> +/**
>>    * devfreq_add_governor() - Add devfreq governor
>>    * @governor:	the devfreq governor to be added
>>    */
>> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
>> index d985199..fbffa74 100644
>> --- a/include/linux/devfreq.h
>> +++ b/include/linux/devfreq.h
>> @@ -205,6 +205,9 @@ extern void devm_devfreq_remove_device(struct device *dev,
>>   extern int devfreq_suspend_device(struct devfreq *devfreq);
>>   extern int devfreq_resume_device(struct devfreq *devfreq);
>>   
>> +extern void devfreq_suspend(void);
>> +extern void devfreq_resume(void);
>> +
>>   /**
>>    * update_devfreq() - Reevaluate the device and configure frequency
>>    * @devfreq:	the devfreq device
>> @@ -331,6 +334,9 @@ static inline int devfreq_resume_device(struct devfreq *devfreq)
>>   	return 0;
>>   }
>>   
>> +static inline void devfreq_suspend(void) {}
>> +static inline void devfreq_resume(void) {}
>> +
>>   static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
>>   					   unsigned long *freq, u32 flags)
>>   {
>>
>

Patch

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 36bed24..7d60423 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -935,6 +935,48 @@  int devfreq_resume_device(struct devfreq *devfreq)
 EXPORT_SYMBOL(devfreq_resume_device);
 
 /**
+ * devfreq_suspend() - Suspend devfreq governors and devices
+ *
+ * Called during system wide Suspend/Hibernate cycles for suspending governors
+ * and devices preserving the state for resume. On some platforms the devfreq
+ * device must have precise state (frequency) after resume in order to provide
+ * fully operating setup.
+ */
+void devfreq_suspend(void)
+{
+	struct devfreq *devfreq;
+	int ret;
+
+	mutex_lock(&devfreq_list_lock);
+	list_for_each_entry(devfreq, &devfreq_list, node) {
+		ret = devfreq_suspend_device(devfreq);
+		if (ret)
+			dev_warn(&devfreq->dev, "device suspend failed\n");
+	}
+	mutex_unlock(&devfreq_list_lock);
+}
+
+/**
+ * devfreq_resume() - Resume devfreq governors and devices
+ *
+ * Called during system wide Suspend/Hibernate cycle for resuming governors and
+ * devices that are suspended with devfreq_suspend().
+ */
+void devfreq_resume(void)
+{
+	struct devfreq *devfreq;
+	int ret;
+
+	mutex_lock(&devfreq_list_lock);
+	list_for_each_entry(devfreq, &devfreq_list, node) {
+		ret = devfreq_resume_device(devfreq);
+		if (ret)
+			dev_warn(&devfreq->dev, "device resume failed\n");
+	}
+	mutex_unlock(&devfreq_list_lock);
+}
+
+/**
  * devfreq_add_governor() - Add devfreq governor
  * @governor:	the devfreq governor to be added
  */
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index d985199..fbffa74 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -205,6 +205,9 @@  extern void devm_devfreq_remove_device(struct device *dev,
 extern int devfreq_suspend_device(struct devfreq *devfreq);
 extern int devfreq_resume_device(struct devfreq *devfreq);
 
+extern void devfreq_suspend(void);
+extern void devfreq_resume(void);
+
 /**
  * update_devfreq() - Reevaluate the device and configure frequency
  * @devfreq:	the devfreq device
@@ -331,6 +334,9 @@  static inline int devfreq_resume_device(struct devfreq *devfreq)
 	return 0;
 }
 
+static inline void devfreq_suspend(void) {}
+static inline void devfreq_resume(void) {}
+
 static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
 					   unsigned long *freq, u32 flags)
 {