Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
2016-12-18 3:19 GMT+09:00 Tobias Jakobi: > Hey Chanwoo, > > > Chanwoo Choi wrote: >> 2016-12-18 0:13 GMT+09:00 Tobias Jakobi : >>> Hey guys, >>> >>> Chanwoo Choi wrote: Hi Lin, 2016-11-24 18:54 GMT+09:00 Chanwoo Choi : > Hi Lin, > > On 2016년 11월 24일 18:28, Chanwoo Choi wrote: >> Hi Lin, >> >> On 2016년 11월 24일 17:34, hl wrote: >>> Hi Chanwoo Choi, >>> >>> >>> On 2016年11月24日 16:16, Chanwoo Choi wrote: Hi Lin, On 2016년 11월 24일 16:34, hl wrote: > Hi Chanwoo Choi, > > I think the dev_pm_opp_get_suspend_opp() have implement most of > the funtion, all we need is just define the node in dts, like > following: > > _opp_table { > opp06 { > opp-suspend; > }; > }; Two approaches use the 'opp-suspend' property. I think that the method to support suspend-opp have to guarantee following conditions: - Support the all of devfreq's governors. >>> As MyungJoo Ham suggestion, i will set the suspend frequency in >>> devfreq_suspend_device(), >>> which will ingore governor. >> >> Other approach already support the all of governors. >> Before calling the mail, I discussed with Myungjoo Ham. >> Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). > > It is not correct expression. We need to wait the reply from Myungjoo > to clarify this. > >> >> To Myungjoo, >> Please add your opinion how to support the suspend frequency. > >> - Devfreq framework have the responsibility to change the frequency/voltage for suspend-opp. If we uses the new devfreq_suspend(), each devfreq device don't care how to support the suspend-opp. Just the developer of each devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. >>> Why should support change the voltage in devfreq framework, i think it >>> shuold be handle in >>> specific driver, i think the devfreq only handle it can get the right >>> frequency, then pass it to >> >> No, the frequency should be handled by governor or framework. >> The each devfreq device has no any responsibility of next >> frequency/voltage. >> The governor and core of devfreq can decide the next frequency/voltage. >> You can refer to the cpufreq subsystem. >> >>> specific driver, i think the voltage should handle in the >>> devfreq->profile->target(); >> >> The call of devfreq->profile->target() have to be handled by devfreq >> framework. >> If user want to set the suspend frequency, user can add the >> 'suspend-opp' property. >> It think this way is easy. >> >> But, >> If the each devfreq device want to decide the next frequency/voltage >> only for >> suspend state. We can check the cpufreq subsystem. >> >> If specific devfreq device want to handle the suspend frequency, >> each devfreq will add the own suspend/resume functions as following: >> >> struct devfreq_dev_profile { >> int (*suspend)(struct devfreq *dev);// new function >> pointer >> int (*resume)(struct devfreq *dev); // new function >> pointer >> } a_profile; >> >> a_profile = devfreq_generic_suspend; >> >> The devfreq framework will provide the devfreq_generic_suspend() >> funticon. >> int devfreq_generic_suspend(struce devfreq *dev) { >> ... >> devfreq->profile->target(..., >> devfreq->suspend_freq); >> ... >> } >> >> or >> >> a_profile = a_devfreq_suspend; // specific function of each >> devfreq device >> >> The devfreq_suspend() will call 'devfreq->profile->suspend()' >> function >> instead of devfreq->profile->target(); >> >> The devfreq call the 'devfreq->profile->suspend()' >> to support the suspend frequency. >> >> Regards, >> Chanwoo Choi > > The key difference between two approaches: > > Your approach: > - The each developer should add the 'opp-suspend' property to the dts > file. > - The each devfreq should call the devfreq_suspend_device() > to support the suspend frequency. > > If each devfreq doesn't call the devfreq_suspend_device(), devfreq > framework > can support the suspend frequency. > > Other approach: > - The each developer only should add the 'opp-suspend' property to the > dts file > without the additional behavior. > > In the cpufreq
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
2016-12-18 3:19 GMT+09:00 Tobias Jakobi : > Hey Chanwoo, > > > Chanwoo Choi wrote: >> 2016-12-18 0:13 GMT+09:00 Tobias Jakobi : >>> Hey guys, >>> >>> Chanwoo Choi wrote: Hi Lin, 2016-11-24 18:54 GMT+09:00 Chanwoo Choi : > Hi Lin, > > On 2016년 11월 24일 18:28, Chanwoo Choi wrote: >> Hi Lin, >> >> On 2016년 11월 24일 17:34, hl wrote: >>> Hi Chanwoo Choi, >>> >>> >>> On 2016年11月24日 16:16, Chanwoo Choi wrote: Hi Lin, On 2016년 11월 24일 16:34, hl wrote: > Hi Chanwoo Choi, > > I think the dev_pm_opp_get_suspend_opp() have implement most of > the funtion, all we need is just define the node in dts, like > following: > > _opp_table { > opp06 { > opp-suspend; > }; > }; Two approaches use the 'opp-suspend' property. I think that the method to support suspend-opp have to guarantee following conditions: - Support the all of devfreq's governors. >>> As MyungJoo Ham suggestion, i will set the suspend frequency in >>> devfreq_suspend_device(), >>> which will ingore governor. >> >> Other approach already support the all of governors. >> Before calling the mail, I discussed with Myungjoo Ham. >> Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). > > It is not correct expression. We need to wait the reply from Myungjoo > to clarify this. > >> >> To Myungjoo, >> Please add your opinion how to support the suspend frequency. > >> - Devfreq framework have the responsibility to change the frequency/voltage for suspend-opp. If we uses the new devfreq_suspend(), each devfreq device don't care how to support the suspend-opp. Just the developer of each devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. >>> Why should support change the voltage in devfreq framework, i think it >>> shuold be handle in >>> specific driver, i think the devfreq only handle it can get the right >>> frequency, then pass it to >> >> No, the frequency should be handled by governor or framework. >> The each devfreq device has no any responsibility of next >> frequency/voltage. >> The governor and core of devfreq can decide the next frequency/voltage. >> You can refer to the cpufreq subsystem. >> >>> specific driver, i think the voltage should handle in the >>> devfreq->profile->target(); >> >> The call of devfreq->profile->target() have to be handled by devfreq >> framework. >> If user want to set the suspend frequency, user can add the >> 'suspend-opp' property. >> It think this way is easy. >> >> But, >> If the each devfreq device want to decide the next frequency/voltage >> only for >> suspend state. We can check the cpufreq subsystem. >> >> If specific devfreq device want to handle the suspend frequency, >> each devfreq will add the own suspend/resume functions as following: >> >> struct devfreq_dev_profile { >> int (*suspend)(struct devfreq *dev);// new function >> pointer >> int (*resume)(struct devfreq *dev); // new function >> pointer >> } a_profile; >> >> a_profile = devfreq_generic_suspend; >> >> The devfreq framework will provide the devfreq_generic_suspend() >> funticon. >> int devfreq_generic_suspend(struce devfreq *dev) { >> ... >> devfreq->profile->target(..., >> devfreq->suspend_freq); >> ... >> } >> >> or >> >> a_profile = a_devfreq_suspend; // specific function of each >> devfreq device >> >> The devfreq_suspend() will call 'devfreq->profile->suspend()' >> function >> instead of devfreq->profile->target(); >> >> The devfreq call the 'devfreq->profile->suspend()' >> to support the suspend frequency. >> >> Regards, >> Chanwoo Choi > > The key difference between two approaches: > > Your approach: > - The each developer should add the 'opp-suspend' property to the dts > file. > - The each devfreq should call the devfreq_suspend_device() > to support the suspend frequency. > > If each devfreq doesn't call the devfreq_suspend_device(), devfreq > framework > can support the suspend frequency. > > Other approach: > - The each developer only should add the 'opp-suspend' property to the > dts file > without the additional behavior. > > In the cpufreq subsystem, > When support the suspend frequency of cpufreq, we just add
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hey Chanwoo, Chanwoo Choi wrote: > 2016-12-18 0:13 GMT+09:00 Tobias Jakobi: >> Hey guys, >> >> Chanwoo Choi wrote: >>> Hi Lin, >>> >>> 2016-11-24 18:54 GMT+09:00 Chanwoo Choi : Hi Lin, On 2016년 11월 24일 18:28, Chanwoo Choi wrote: > Hi Lin, > > On 2016년 11월 24일 17:34, hl wrote: >> Hi Chanwoo Choi, >> >> >> On 2016年11月24日 16:16, Chanwoo Choi wrote: >>> Hi Lin, >>> >>> On 2016년 11월 24일 16:34, hl wrote: Hi Chanwoo Choi, I think the dev_pm_opp_get_suspend_opp() have implement most of the funtion, all we need is just define the node in dts, like following: _opp_table { opp06 { opp-suspend; }; }; >>> Two approaches use the 'opp-suspend' property. >>> >>> I think that the method to support suspend-opp have to >>> guarantee following conditions: >>> - Support the all of devfreq's governors. >> As MyungJoo Ham suggestion, i will set the suspend frequency in >> devfreq_suspend_device(), >> which will ingore governor. > > Other approach already support the all of governors. > Before calling the mail, I discussed with Myungjoo Ham. > Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). It is not correct expression. We need to wait the reply from Myungjoo to clarify this. > > To Myungjoo, > Please add your opinion how to support the suspend frequency. > >>> - Devfreq framework have the responsibility to change the >>>frequency/voltage for suspend-opp. If we uses the >>>new devfreq_suspend(), each devfreq device don't care >>>how to support the suspend-opp. Just the developer of each >>>devfreq device need to add 'opp-suspend' propet to OPP entry in DT >>> file. >> Why should support change the voltage in devfreq framework, i think it >> shuold be handle in >> specific driver, i think the devfreq only handle it can get the right >> frequency, then pass it to > > No, the frequency should be handled by governor or framework. > The each devfreq device has no any responsibility of next > frequency/voltage. > The governor and core of devfreq can decide the next frequency/voltage. > You can refer to the cpufreq subsystem. > >> specific driver, i think the voltage should handle in the >> devfreq->profile->target(); > > The call of devfreq->profile->target() have to be handled by devfreq > framework. > If user want to set the suspend frequency, user can add the 'suspend-opp' > property. > It think this way is easy. > > But, > If the each devfreq device want to decide the next frequency/voltage only > for > suspend state. We can check the cpufreq subsystem. > > If specific devfreq device want to handle the suspend frequency, > each devfreq will add the own suspend/resume functions as following: > > struct devfreq_dev_profile { > int (*suspend)(struct devfreq *dev);// new function > pointer > int (*resume)(struct devfreq *dev); // new function > pointer > } a_profile; > > a_profile = devfreq_generic_suspend; > > The devfreq framework will provide the devfreq_generic_suspend() > funticon. > int devfreq_generic_suspend(struce devfreq *dev) { > ... > devfreq->profile->target(..., > devfreq->suspend_freq); > ... > } > > or > > a_profile = a_devfreq_suspend; // specific function of each devfreq > device > > The devfreq_suspend() will call 'devfreq->profile->suspend()' > function > instead of devfreq->profile->target(); > > The devfreq call the 'devfreq->profile->suspend()' > to support the suspend frequency. > > Regards, > Chanwoo Choi The key difference between two approaches: Your approach: - The each developer should add the 'opp-suspend' property to the dts file. - The each devfreq should call the devfreq_suspend_device() to support the suspend frequency. If each devfreq doesn't call the devfreq_suspend_device(), devfreq framework can support the suspend frequency. Other approach: - The each developer only should add the 'opp-suspend' property to the dts file without the additional behavior. In the cpufreq subsystem, When support the suspend frequency of cpufreq, we just add 'opp-suspend' property without the additional behavior. >>> >>> I'm missing the use-case when using the devfreq_suspend_device() >>> before
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hey Chanwoo, Chanwoo Choi wrote: > 2016-12-18 0:13 GMT+09:00 Tobias Jakobi : >> Hey guys, >> >> Chanwoo Choi wrote: >>> Hi Lin, >>> >>> 2016-11-24 18:54 GMT+09:00 Chanwoo Choi : Hi Lin, On 2016년 11월 24일 18:28, Chanwoo Choi wrote: > Hi Lin, > > On 2016년 11월 24일 17:34, hl wrote: >> Hi Chanwoo Choi, >> >> >> On 2016年11月24日 16:16, Chanwoo Choi wrote: >>> Hi Lin, >>> >>> On 2016년 11월 24일 16:34, hl wrote: Hi Chanwoo Choi, I think the dev_pm_opp_get_suspend_opp() have implement most of the funtion, all we need is just define the node in dts, like following: _opp_table { opp06 { opp-suspend; }; }; >>> Two approaches use the 'opp-suspend' property. >>> >>> I think that the method to support suspend-opp have to >>> guarantee following conditions: >>> - Support the all of devfreq's governors. >> As MyungJoo Ham suggestion, i will set the suspend frequency in >> devfreq_suspend_device(), >> which will ingore governor. > > Other approach already support the all of governors. > Before calling the mail, I discussed with Myungjoo Ham. > Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). It is not correct expression. We need to wait the reply from Myungjoo to clarify this. > > To Myungjoo, > Please add your opinion how to support the suspend frequency. > >>> - Devfreq framework have the responsibility to change the >>>frequency/voltage for suspend-opp. If we uses the >>>new devfreq_suspend(), each devfreq device don't care >>>how to support the suspend-opp. Just the developer of each >>>devfreq device need to add 'opp-suspend' propet to OPP entry in DT >>> file. >> Why should support change the voltage in devfreq framework, i think it >> shuold be handle in >> specific driver, i think the devfreq only handle it can get the right >> frequency, then pass it to > > No, the frequency should be handled by governor or framework. > The each devfreq device has no any responsibility of next > frequency/voltage. > The governor and core of devfreq can decide the next frequency/voltage. > You can refer to the cpufreq subsystem. > >> specific driver, i think the voltage should handle in the >> devfreq->profile->target(); > > The call of devfreq->profile->target() have to be handled by devfreq > framework. > If user want to set the suspend frequency, user can add the 'suspend-opp' > property. > It think this way is easy. > > But, > If the each devfreq device want to decide the next frequency/voltage only > for > suspend state. We can check the cpufreq subsystem. > > If specific devfreq device want to handle the suspend frequency, > each devfreq will add the own suspend/resume functions as following: > > struct devfreq_dev_profile { > int (*suspend)(struct devfreq *dev);// new function > pointer > int (*resume)(struct devfreq *dev); // new function > pointer > } a_profile; > > a_profile = devfreq_generic_suspend; > > The devfreq framework will provide the devfreq_generic_suspend() > funticon. > int devfreq_generic_suspend(struce devfreq *dev) { > ... > devfreq->profile->target(..., > devfreq->suspend_freq); > ... > } > > or > > a_profile = a_devfreq_suspend; // specific function of each devfreq > device > > The devfreq_suspend() will call 'devfreq->profile->suspend()' > function > instead of devfreq->profile->target(); > > The devfreq call the 'devfreq->profile->suspend()' > to support the suspend frequency. > > Regards, > Chanwoo Choi The key difference between two approaches: Your approach: - The each developer should add the 'opp-suspend' property to the dts file. - The each devfreq should call the devfreq_suspend_device() to support the suspend frequency. If each devfreq doesn't call the devfreq_suspend_device(), devfreq framework can support the suspend frequency. Other approach: - The each developer only should add the 'opp-suspend' property to the dts file without the additional behavior. In the cpufreq subsystem, When support the suspend frequency of cpufreq, we just add 'opp-suspend' property without the additional behavior. >>> >>> I'm missing the use-case when using the devfreq_suspend_device() >>> before entering the suspend mode. We should consider the
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
2016-12-18 0:13 GMT+09:00 Tobias Jakobi: > Hey guys, > > Chanwoo Choi wrote: >> Hi Lin, >> >> 2016-11-24 18:54 GMT+09:00 Chanwoo Choi : >>> Hi Lin, >>> >>> On 2016년 11월 24일 18:28, Chanwoo Choi wrote: Hi Lin, On 2016년 11월 24일 17:34, hl wrote: > Hi Chanwoo Choi, > > > On 2016年11月24日 16:16, Chanwoo Choi wrote: >> Hi Lin, >> >> On 2016년 11월 24일 16:34, hl wrote: >>> Hi Chanwoo Choi, >>> >>> I think the dev_pm_opp_get_suspend_opp() have implement most of >>> the funtion, all we need is just define the node in dts, like following: >>> >>> _opp_table { >>> opp06 { >>> opp-suspend; >>> }; >>> }; >> Two approaches use the 'opp-suspend' property. >> >> I think that the method to support suspend-opp have to >> guarantee following conditions: >> - Support the all of devfreq's governors. > As MyungJoo Ham suggestion, i will set the suspend frequency in > devfreq_suspend_device(), > which will ingore governor. Other approach already support the all of governors. Before calling the mail, I discussed with Myungjoo Ham. Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). >>> >>> It is not correct expression. We need to wait the reply from Myungjoo >>> to clarify this. >>> To Myungjoo, Please add your opinion how to support the suspend frequency. >>> >> - Devfreq framework have the responsibility to change the >>frequency/voltage for suspend-opp. If we uses the >>new devfreq_suspend(), each devfreq device don't care >>how to support the suspend-opp. Just the developer of each >>devfreq device need to add 'opp-suspend' propet to OPP entry in DT >> file. > Why should support change the voltage in devfreq framework, i think it > shuold be handle in > specific driver, i think the devfreq only handle it can get the right > frequency, then pass it to No, the frequency should be handled by governor or framework. The each devfreq device has no any responsibility of next frequency/voltage. The governor and core of devfreq can decide the next frequency/voltage. You can refer to the cpufreq subsystem. > specific driver, i think the voltage should handle in the > devfreq->profile->target(); The call of devfreq->profile->target() have to be handled by devfreq framework. If user want to set the suspend frequency, user can add the 'suspend-opp' property. It think this way is easy. But, If the each devfreq device want to decide the next frequency/voltage only for suspend state. We can check the cpufreq subsystem. If specific devfreq device want to handle the suspend frequency, each devfreq will add the own suspend/resume functions as following: struct devfreq_dev_profile { int (*suspend)(struct devfreq *dev);// new function pointer int (*resume)(struct devfreq *dev); // new function pointer } a_profile; a_profile = devfreq_generic_suspend; The devfreq framework will provide the devfreq_generic_suspend() funticon. int devfreq_generic_suspend(struce devfreq *dev) { ... devfreq->profile->target(..., devfreq->suspend_freq); ... } or a_profile = a_devfreq_suspend; // specific function of each devfreq device The devfreq_suspend() will call 'devfreq->profile->suspend()' function instead of devfreq->profile->target(); The devfreq call the 'devfreq->profile->suspend()' to support the suspend frequency. Regards, Chanwoo Choi >>> >>> The key difference between two approaches: >>> >>> Your approach: >>> - The each developer should add the 'opp-suspend' property to the dts file. >>> - The each devfreq should call the devfreq_suspend_device() >>> to support the suspend frequency. >>> >>> If each devfreq doesn't call the devfreq_suspend_device(), devfreq >>> framework >>> can support the suspend frequency. >>> >>> Other approach: >>> - The each developer only should add the 'opp-suspend' property to the dts >>> file >>> without the additional behavior. >>> >>> In the cpufreq subsystem, >>> When support the suspend frequency of cpufreq, we just add 'opp-suspend' >>> property >>> without the additional behavior. >> >> I'm missing the use-case when using the devfreq_suspend_device() >> before entering the suspend mode. We should consider the case when >> devfreq device >> calls the devfreq_suspend_device() directly. Because devfreq_suspend_device() >> is exported function, each
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
2016-12-18 0:13 GMT+09:00 Tobias Jakobi : > Hey guys, > > Chanwoo Choi wrote: >> Hi Lin, >> >> 2016-11-24 18:54 GMT+09:00 Chanwoo Choi : >>> Hi Lin, >>> >>> On 2016년 11월 24일 18:28, Chanwoo Choi wrote: Hi Lin, On 2016년 11월 24일 17:34, hl wrote: > Hi Chanwoo Choi, > > > On 2016年11月24日 16:16, Chanwoo Choi wrote: >> Hi Lin, >> >> On 2016년 11월 24일 16:34, hl wrote: >>> Hi Chanwoo Choi, >>> >>> I think the dev_pm_opp_get_suspend_opp() have implement most of >>> the funtion, all we need is just define the node in dts, like following: >>> >>> _opp_table { >>> opp06 { >>> opp-suspend; >>> }; >>> }; >> Two approaches use the 'opp-suspend' property. >> >> I think that the method to support suspend-opp have to >> guarantee following conditions: >> - Support the all of devfreq's governors. > As MyungJoo Ham suggestion, i will set the suspend frequency in > devfreq_suspend_device(), > which will ingore governor. Other approach already support the all of governors. Before calling the mail, I discussed with Myungjoo Ham. Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). >>> >>> It is not correct expression. We need to wait the reply from Myungjoo >>> to clarify this. >>> To Myungjoo, Please add your opinion how to support the suspend frequency. >>> >> - Devfreq framework have the responsibility to change the >>frequency/voltage for suspend-opp. If we uses the >>new devfreq_suspend(), each devfreq device don't care >>how to support the suspend-opp. Just the developer of each >>devfreq device need to add 'opp-suspend' propet to OPP entry in DT >> file. > Why should support change the voltage in devfreq framework, i think it > shuold be handle in > specific driver, i think the devfreq only handle it can get the right > frequency, then pass it to No, the frequency should be handled by governor or framework. The each devfreq device has no any responsibility of next frequency/voltage. The governor and core of devfreq can decide the next frequency/voltage. You can refer to the cpufreq subsystem. > specific driver, i think the voltage should handle in the > devfreq->profile->target(); The call of devfreq->profile->target() have to be handled by devfreq framework. If user want to set the suspend frequency, user can add the 'suspend-opp' property. It think this way is easy. But, If the each devfreq device want to decide the next frequency/voltage only for suspend state. We can check the cpufreq subsystem. If specific devfreq device want to handle the suspend frequency, each devfreq will add the own suspend/resume functions as following: struct devfreq_dev_profile { int (*suspend)(struct devfreq *dev);// new function pointer int (*resume)(struct devfreq *dev); // new function pointer } a_profile; a_profile = devfreq_generic_suspend; The devfreq framework will provide the devfreq_generic_suspend() funticon. int devfreq_generic_suspend(struce devfreq *dev) { ... devfreq->profile->target(..., devfreq->suspend_freq); ... } or a_profile = a_devfreq_suspend; // specific function of each devfreq device The devfreq_suspend() will call 'devfreq->profile->suspend()' function instead of devfreq->profile->target(); The devfreq call the 'devfreq->profile->suspend()' to support the suspend frequency. Regards, Chanwoo Choi >>> >>> The key difference between two approaches: >>> >>> Your approach: >>> - The each developer should add the 'opp-suspend' property to the dts file. >>> - The each devfreq should call the devfreq_suspend_device() >>> to support the suspend frequency. >>> >>> If each devfreq doesn't call the devfreq_suspend_device(), devfreq >>> framework >>> can support the suspend frequency. >>> >>> Other approach: >>> - The each developer only should add the 'opp-suspend' property to the dts >>> file >>> without the additional behavior. >>> >>> In the cpufreq subsystem, >>> When support the suspend frequency of cpufreq, we just add 'opp-suspend' >>> property >>> without the additional behavior. >> >> I'm missing the use-case when using the devfreq_suspend_device() >> before entering the suspend mode. We should consider the case when >> devfreq device >> calls the devfreq_suspend_device() directly. Because devfreq_suspend_device() >> is exported function, each devfreq device call this function on the fly >> without
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hey guys, Chanwoo Choi wrote: > Hi Lin, > > 2016-11-24 18:54 GMT+09:00 Chanwoo Choi: >> Hi Lin, >> >> On 2016년 11월 24일 18:28, Chanwoo Choi wrote: >>> Hi Lin, >>> >>> On 2016년 11월 24일 17:34, hl wrote: Hi Chanwoo Choi, On 2016年11月24日 16:16, Chanwoo Choi wrote: > Hi Lin, > > On 2016년 11월 24일 16:34, hl wrote: >> Hi Chanwoo Choi, >> >> I think the dev_pm_opp_get_suspend_opp() have implement most of >> the funtion, all we need is just define the node in dts, like following: >> >> _opp_table { >> opp06 { >> opp-suspend; >> }; >> }; > Two approaches use the 'opp-suspend' property. > > I think that the method to support suspend-opp have to > guarantee following conditions: > - Support the all of devfreq's governors. As MyungJoo Ham suggestion, i will set the suspend frequency in devfreq_suspend_device(), which will ingore governor. >>> >>> Other approach already support the all of governors. >>> Before calling the mail, I discussed with Myungjoo Ham. >>> Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). >> >> It is not correct expression. We need to wait the reply from Myungjoo >> to clarify this. >> >>> >>> To Myungjoo, >>> Please add your opinion how to support the suspend frequency. >> >>> > - Devfreq framework have the responsibility to change the >frequency/voltage for suspend-opp. If we uses the >new devfreq_suspend(), each devfreq device don't care >how to support the suspend-opp. Just the developer of each >devfreq device need to add 'opp-suspend' propet to OPP entry in DT > file. Why should support change the voltage in devfreq framework, i think it shuold be handle in specific driver, i think the devfreq only handle it can get the right frequency, then pass it to >>> >>> No, the frequency should be handled by governor or framework. >>> The each devfreq device has no any responsibility of next frequency/voltage. >>> The governor and core of devfreq can decide the next frequency/voltage. >>> You can refer to the cpufreq subsystem. >>> specific driver, i think the voltage should handle in the devfreq->profile->target(); >>> >>> The call of devfreq->profile->target() have to be handled by devfreq >>> framework. >>> If user want to set the suspend frequency, user can add the 'suspend-opp' >>> property. >>> It think this way is easy. >>> >>> But, >>> If the each devfreq device want to decide the next frequency/voltage only >>> for >>> suspend state. We can check the cpufreq subsystem. >>> >>> If specific devfreq device want to handle the suspend frequency, >>> each devfreq will add the own suspend/resume functions as following: >>> >>> struct devfreq_dev_profile { >>> int (*suspend)(struct devfreq *dev);// new function >>> pointer >>> int (*resume)(struct devfreq *dev); // new function >>> pointer >>> } a_profile; >>> >>> a_profile = devfreq_generic_suspend; >>> >>> The devfreq framework will provide the devfreq_generic_suspend() >>> funticon. >>> int devfreq_generic_suspend(struce devfreq *dev) { >>> ... >>> devfreq->profile->target(..., devfreq->suspend_freq); >>> ... >>> } >>> >>> or >>> >>> a_profile = a_devfreq_suspend; // specific function of each devfreq >>> device >>> >>> The devfreq_suspend() will call 'devfreq->profile->suspend()' function >>> instead of devfreq->profile->target(); >>> >>> The devfreq call the 'devfreq->profile->suspend()' >>> to support the suspend frequency. >>> >>> Regards, >>> Chanwoo Choi >> >> The key difference between two approaches: >> >> Your approach: >> - The each developer should add the 'opp-suspend' property to the dts file. >> - The each devfreq should call the devfreq_suspend_device() >> to support the suspend frequency. >> >> If each devfreq doesn't call the devfreq_suspend_device(), devfreq >> framework >> can support the suspend frequency. >> >> Other approach: >> - The each developer only should add the 'opp-suspend' property to the dts >> file >> without the additional behavior. >> >> In the cpufreq subsystem, >> When support the suspend frequency of cpufreq, we just add 'opp-suspend' >> property >> without the additional behavior. > > I'm missing the use-case when using the devfreq_suspend_device() > before entering the suspend mode. We should consider the case when > devfreq device > calls the devfreq_suspend_device() directly. Because devfreq_suspend_device() > is exported function, each devfreq device call this function on the fly > without entering the suspend mode. > > I correct my opinion. Your approach is necessary. I'm sorry to confuse you. > So, I make the following patch. This patch set the suspend
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hey guys, Chanwoo Choi wrote: > Hi Lin, > > 2016-11-24 18:54 GMT+09:00 Chanwoo Choi : >> Hi Lin, >> >> On 2016년 11월 24일 18:28, Chanwoo Choi wrote: >>> Hi Lin, >>> >>> On 2016년 11월 24일 17:34, hl wrote: Hi Chanwoo Choi, On 2016年11月24日 16:16, Chanwoo Choi wrote: > Hi Lin, > > On 2016년 11월 24일 16:34, hl wrote: >> Hi Chanwoo Choi, >> >> I think the dev_pm_opp_get_suspend_opp() have implement most of >> the funtion, all we need is just define the node in dts, like following: >> >> _opp_table { >> opp06 { >> opp-suspend; >> }; >> }; > Two approaches use the 'opp-suspend' property. > > I think that the method to support suspend-opp have to > guarantee following conditions: > - Support the all of devfreq's governors. As MyungJoo Ham suggestion, i will set the suspend frequency in devfreq_suspend_device(), which will ingore governor. >>> >>> Other approach already support the all of governors. >>> Before calling the mail, I discussed with Myungjoo Ham. >>> Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). >> >> It is not correct expression. We need to wait the reply from Myungjoo >> to clarify this. >> >>> >>> To Myungjoo, >>> Please add your opinion how to support the suspend frequency. >> >>> > - Devfreq framework have the responsibility to change the >frequency/voltage for suspend-opp. If we uses the >new devfreq_suspend(), each devfreq device don't care >how to support the suspend-opp. Just the developer of each >devfreq device need to add 'opp-suspend' propet to OPP entry in DT > file. Why should support change the voltage in devfreq framework, i think it shuold be handle in specific driver, i think the devfreq only handle it can get the right frequency, then pass it to >>> >>> No, the frequency should be handled by governor or framework. >>> The each devfreq device has no any responsibility of next frequency/voltage. >>> The governor and core of devfreq can decide the next frequency/voltage. >>> You can refer to the cpufreq subsystem. >>> specific driver, i think the voltage should handle in the devfreq->profile->target(); >>> >>> The call of devfreq->profile->target() have to be handled by devfreq >>> framework. >>> If user want to set the suspend frequency, user can add the 'suspend-opp' >>> property. >>> It think this way is easy. >>> >>> But, >>> If the each devfreq device want to decide the next frequency/voltage only >>> for >>> suspend state. We can check the cpufreq subsystem. >>> >>> If specific devfreq device want to handle the suspend frequency, >>> each devfreq will add the own suspend/resume functions as following: >>> >>> struct devfreq_dev_profile { >>> int (*suspend)(struct devfreq *dev);// new function >>> pointer >>> int (*resume)(struct devfreq *dev); // new function >>> pointer >>> } a_profile; >>> >>> a_profile = devfreq_generic_suspend; >>> >>> The devfreq framework will provide the devfreq_generic_suspend() >>> funticon. >>> int devfreq_generic_suspend(struce devfreq *dev) { >>> ... >>> devfreq->profile->target(..., devfreq->suspend_freq); >>> ... >>> } >>> >>> or >>> >>> a_profile = a_devfreq_suspend; // specific function of each devfreq >>> device >>> >>> The devfreq_suspend() will call 'devfreq->profile->suspend()' function >>> instead of devfreq->profile->target(); >>> >>> The devfreq call the 'devfreq->profile->suspend()' >>> to support the suspend frequency. >>> >>> Regards, >>> Chanwoo Choi >> >> The key difference between two approaches: >> >> Your approach: >> - The each developer should add the 'opp-suspend' property to the dts file. >> - The each devfreq should call the devfreq_suspend_device() >> to support the suspend frequency. >> >> If each devfreq doesn't call the devfreq_suspend_device(), devfreq >> framework >> can support the suspend frequency. >> >> Other approach: >> - The each developer only should add the 'opp-suspend' property to the dts >> file >> without the additional behavior. >> >> In the cpufreq subsystem, >> When support the suspend frequency of cpufreq, we just add 'opp-suspend' >> property >> without the additional behavior. > > I'm missing the use-case when using the devfreq_suspend_device() > before entering the suspend mode. We should consider the case when > devfreq device > calls the devfreq_suspend_device() directly. Because devfreq_suspend_device() > is exported function, each devfreq device call this function on the fly > without entering the suspend mode. > > I correct my opinion. Your approach is necessary. I'm sorry to confuse you. > So, I make the following patch. This patch set the suspend frequency > in
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Lin, 2016-11-24 18:54 GMT+09:00 Chanwoo Choi: > Hi Lin, > > On 2016년 11월 24일 18:28, Chanwoo Choi wrote: >> Hi Lin, >> >> On 2016년 11월 24일 17:34, hl wrote: >>> Hi Chanwoo Choi, >>> >>> >>> On 2016年11月24日 16:16, Chanwoo Choi wrote: Hi Lin, On 2016년 11월 24일 16:34, hl wrote: > Hi Chanwoo Choi, > > I think the dev_pm_opp_get_suspend_opp() have implement most of > the funtion, all we need is just define the node in dts, like following: > > _opp_table { > opp06 { > opp-suspend; > }; > }; Two approaches use the 'opp-suspend' property. I think that the method to support suspend-opp have to guarantee following conditions: - Support the all of devfreq's governors. >>> As MyungJoo Ham suggestion, i will set the suspend frequency in >>> devfreq_suspend_device(), >>> which will ingore governor. >> >> Other approach already support the all of governors. >> Before calling the mail, I discussed with Myungjoo Ham. >> Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). > > It is not correct expression. We need to wait the reply from Myungjoo > to clarify this. > >> >> To Myungjoo, >> Please add your opinion how to support the suspend frequency. > >> - Devfreq framework have the responsibility to change the frequency/voltage for suspend-opp. If we uses the new devfreq_suspend(), each devfreq device don't care how to support the suspend-opp. Just the developer of each devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. >>> Why should support change the voltage in devfreq framework, i think it >>> shuold be handle in >>> specific driver, i think the devfreq only handle it can get the right >>> frequency, then pass it to >> >> No, the frequency should be handled by governor or framework. >> The each devfreq device has no any responsibility of next frequency/voltage. >> The governor and core of devfreq can decide the next frequency/voltage. >> You can refer to the cpufreq subsystem. >> >>> specific driver, i think the voltage should handle in the >>> devfreq->profile->target(); >> >> The call of devfreq->profile->target() have to be handled by devfreq >> framework. >> If user want to set the suspend frequency, user can add the 'suspend-opp' >> property. >> It think this way is easy. >> >> But, >> If the each devfreq device want to decide the next frequency/voltage only for >> suspend state. We can check the cpufreq subsystem. >> >> If specific devfreq device want to handle the suspend frequency, >> each devfreq will add the own suspend/resume functions as following: >> >> struct devfreq_dev_profile { >> int (*suspend)(struct devfreq *dev);// new function pointer >> int (*resume)(struct devfreq *dev); // new function pointer >> } a_profile; >> >> a_profile = devfreq_generic_suspend; >> >> The devfreq framework will provide the devfreq_generic_suspend() >> funticon. >> int devfreq_generic_suspend(struce devfreq *dev) { >> ... >> devfreq->profile->target(..., devfreq->suspend_freq); >> ... >> } >> >> or >> >> a_profile = a_devfreq_suspend; // specific function of each devfreq >> device >> >> The devfreq_suspend() will call 'devfreq->profile->suspend()' function >> instead of devfreq->profile->target(); >> >> The devfreq call the 'devfreq->profile->suspend()' >> to support the suspend frequency. >> >> Regards, >> Chanwoo Choi > > The key difference between two approaches: > > Your approach: > - The each developer should add the 'opp-suspend' property to the dts file. > - The each devfreq should call the devfreq_suspend_device() > to support the suspend frequency. > > If each devfreq doesn't call the devfreq_suspend_device(), devfreq framework > can support the suspend frequency. > > Other approach: > - The each developer only should add the 'opp-suspend' property to the dts > file > without the additional behavior. > > In the cpufreq subsystem, > When support the suspend frequency of cpufreq, we just add 'opp-suspend' > property > without the additional behavior. I'm missing the use-case when using the devfreq_suspend_device() before entering the suspend mode. We should consider the case when devfreq device calls the devfreq_suspend_device() directly. Because devfreq_suspend_device() is exported function, each devfreq device call this function on the fly without entering the suspend mode. I correct my opinion. Your approach is necessary. I'm sorry to confuse you. So, I make the following patch. This patch set the suspend frequency in devfreq_suspend_device() after stoping the governor. It consider the all governors of devfreq. What do you think? If you are ok, I'll send this patch with your author. int
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Lin, 2016-11-24 18:54 GMT+09:00 Chanwoo Choi : > Hi Lin, > > On 2016년 11월 24일 18:28, Chanwoo Choi wrote: >> Hi Lin, >> >> On 2016년 11월 24일 17:34, hl wrote: >>> Hi Chanwoo Choi, >>> >>> >>> On 2016年11月24日 16:16, Chanwoo Choi wrote: Hi Lin, On 2016년 11월 24일 16:34, hl wrote: > Hi Chanwoo Choi, > > I think the dev_pm_opp_get_suspend_opp() have implement most of > the funtion, all we need is just define the node in dts, like following: > > _opp_table { > opp06 { > opp-suspend; > }; > }; Two approaches use the 'opp-suspend' property. I think that the method to support suspend-opp have to guarantee following conditions: - Support the all of devfreq's governors. >>> As MyungJoo Ham suggestion, i will set the suspend frequency in >>> devfreq_suspend_device(), >>> which will ingore governor. >> >> Other approach already support the all of governors. >> Before calling the mail, I discussed with Myungjoo Ham. >> Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). > > It is not correct expression. We need to wait the reply from Myungjoo > to clarify this. > >> >> To Myungjoo, >> Please add your opinion how to support the suspend frequency. > >> - Devfreq framework have the responsibility to change the frequency/voltage for suspend-opp. If we uses the new devfreq_suspend(), each devfreq device don't care how to support the suspend-opp. Just the developer of each devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. >>> Why should support change the voltage in devfreq framework, i think it >>> shuold be handle in >>> specific driver, i think the devfreq only handle it can get the right >>> frequency, then pass it to >> >> No, the frequency should be handled by governor or framework. >> The each devfreq device has no any responsibility of next frequency/voltage. >> The governor and core of devfreq can decide the next frequency/voltage. >> You can refer to the cpufreq subsystem. >> >>> specific driver, i think the voltage should handle in the >>> devfreq->profile->target(); >> >> The call of devfreq->profile->target() have to be handled by devfreq >> framework. >> If user want to set the suspend frequency, user can add the 'suspend-opp' >> property. >> It think this way is easy. >> >> But, >> If the each devfreq device want to decide the next frequency/voltage only for >> suspend state. We can check the cpufreq subsystem. >> >> If specific devfreq device want to handle the suspend frequency, >> each devfreq will add the own suspend/resume functions as following: >> >> struct devfreq_dev_profile { >> int (*suspend)(struct devfreq *dev);// new function pointer >> int (*resume)(struct devfreq *dev); // new function pointer >> } a_profile; >> >> a_profile = devfreq_generic_suspend; >> >> The devfreq framework will provide the devfreq_generic_suspend() >> funticon. >> int devfreq_generic_suspend(struce devfreq *dev) { >> ... >> devfreq->profile->target(..., devfreq->suspend_freq); >> ... >> } >> >> or >> >> a_profile = a_devfreq_suspend; // specific function of each devfreq >> device >> >> The devfreq_suspend() will call 'devfreq->profile->suspend()' function >> instead of devfreq->profile->target(); >> >> The devfreq call the 'devfreq->profile->suspend()' >> to support the suspend frequency. >> >> Regards, >> Chanwoo Choi > > The key difference between two approaches: > > Your approach: > - The each developer should add the 'opp-suspend' property to the dts file. > - The each devfreq should call the devfreq_suspend_device() > to support the suspend frequency. > > If each devfreq doesn't call the devfreq_suspend_device(), devfreq framework > can support the suspend frequency. > > Other approach: > - The each developer only should add the 'opp-suspend' property to the dts > file > without the additional behavior. > > In the cpufreq subsystem, > When support the suspend frequency of cpufreq, we just add 'opp-suspend' > property > without the additional behavior. I'm missing the use-case when using the devfreq_suspend_device() before entering the suspend mode. We should consider the case when devfreq device calls the devfreq_suspend_device() directly. Because devfreq_suspend_device() is exported function, each devfreq device call this function on the fly without entering the suspend mode. I correct my opinion. Your approach is necessary. I'm sorry to confuse you. So, I make the following patch. This patch set the suspend frequency in devfreq_suspend_device() after stoping the governor. It consider the all governors of devfreq. What do you think? If you are ok, I'll send this patch with your author. int devfreq_suspend_device(struct devfreq
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Lin, On 2016년 11월 24일 18:28, Chanwoo Choi wrote: > Hi Lin, > > On 2016년 11월 24일 17:34, hl wrote: >> Hi Chanwoo Choi, >> >> >> On 2016年11月24日 16:16, Chanwoo Choi wrote: >>> Hi Lin, >>> >>> On 2016년 11월 24일 16:34, hl wrote: Hi Chanwoo Choi, I think the dev_pm_opp_get_suspend_opp() have implement most of the funtion, all we need is just define the node in dts, like following: _opp_table { opp06 { opp-suspend; }; }; >>> Two approaches use the 'opp-suspend' property. >>> >>> I think that the method to support suspend-opp have to >>> guarantee following conditions: >>> - Support the all of devfreq's governors. >> As MyungJoo Ham suggestion, i will set the suspend frequency in >> devfreq_suspend_device(), >> which will ingore governor. > > Other approach already support the all of governors. > Before calling the mail, I discussed with Myungjoo Ham. > Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). It is not correct expression. We need to wait the reply from Myungjoo to clarify this. > > To Myungjoo, > Please add your opinion how to support the suspend frequency. > >>> - Devfreq framework have the responsibility to change the >>>frequency/voltage for suspend-opp. If we uses the >>>new devfreq_suspend(), each devfreq device don't care >>>how to support the suspend-opp. Just the developer of each >>>devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. >> Why should support change the voltage in devfreq framework, i think it >> shuold be handle in >> specific driver, i think the devfreq only handle it can get the right >> frequency, then pass it to > > No, the frequency should be handled by governor or framework. > The each devfreq device has no any responsibility of next frequency/voltage. > The governor and core of devfreq can decide the next frequency/voltage. > You can refer to the cpufreq subsystem. > >> specific driver, i think the voltage should handle in the >> devfreq->profile->target(); > > The call of devfreq->profile->target() have to be handled by devfreq > framework. > If user want to set the suspend frequency, user can add the 'suspend-opp' > property. > It think this way is easy. > > But, > If the each devfreq device want to decide the next frequency/voltage only for > suspend state. We can check the cpufreq subsystem. > > If specific devfreq device want to handle the suspend frequency, > each devfreq will add the own suspend/resume functions as following: > > struct devfreq_dev_profile { > int (*suspend)(struct devfreq *dev);// new function pointer > int (*resume)(struct devfreq *dev); // new function pointer > } a_profile; > > a_profile = devfreq_generic_suspend; > > The devfreq framework will provide the devfreq_generic_suspend() > funticon. > int devfreq_generic_suspend(struce devfreq *dev) { > ... > devfreq->profile->target(..., devfreq->suspend_freq); > ... > } > > or > > a_profile = a_devfreq_suspend; // specific function of each devfreq > device > > The devfreq_suspend() will call 'devfreq->profile->suspend()' function > instead of devfreq->profile->target(); > > The devfreq call the 'devfreq->profile->suspend()' > to support the suspend frequency. > > Regards, > Chanwoo Choi The key difference between two approaches: Your approach: - The each developer should add the 'opp-suspend' property to the dts file. - The each devfreq should call the devfreq_suspend_device() to support the suspend frequency. If each devfreq doesn't call the devfreq_suspend_device(), devfreq framework can support the suspend frequency. Other approach: - The each developer only should add the 'opp-suspend' property to the dts file without the additional behavior. In the cpufreq subsystem, When support the suspend frequency of cpufreq, we just add 'opp-suspend' property without the additional behavior. Regards, Chanwoo Choi > >>> Best Regards, >>> Chanwoo Choi >>> so i think my way semm more simple. On 2016年11月24日 15:10, Chanwoo Choi wrote: > + Tobias Jakobi, > > Hi Lin, > > We need to discuss how to support the suspend-opp of devfreq device. > Now, there are two patch thread for suspend-opp of devfreq. > > The Lin's approach modify the devfreq_suspend_device() to support > suspend-opp. > The Tobias's approach[1] add new devfreq_suspend() and then call it on > dpm_suspend() > when entering the suspend state. > > [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl > - https://patchwork.kernel.org/patch/9443323/ > - https://patchwork.kernel.org/patch/9443325/ > - https://patchwork.kernel.org/patch/9443329/ > - https://patchwork.kernel.org/patch/9443331/ >
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Lin, On 2016년 11월 24일 18:28, Chanwoo Choi wrote: > Hi Lin, > > On 2016년 11월 24일 17:34, hl wrote: >> Hi Chanwoo Choi, >> >> >> On 2016年11月24日 16:16, Chanwoo Choi wrote: >>> Hi Lin, >>> >>> On 2016년 11월 24일 16:34, hl wrote: Hi Chanwoo Choi, I think the dev_pm_opp_get_suspend_opp() have implement most of the funtion, all we need is just define the node in dts, like following: _opp_table { opp06 { opp-suspend; }; }; >>> Two approaches use the 'opp-suspend' property. >>> >>> I think that the method to support suspend-opp have to >>> guarantee following conditions: >>> - Support the all of devfreq's governors. >> As MyungJoo Ham suggestion, i will set the suspend frequency in >> devfreq_suspend_device(), >> which will ingore governor. > > Other approach already support the all of governors. > Before calling the mail, I discussed with Myungjoo Ham. > Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). It is not correct expression. We need to wait the reply from Myungjoo to clarify this. > > To Myungjoo, > Please add your opinion how to support the suspend frequency. > >>> - Devfreq framework have the responsibility to change the >>>frequency/voltage for suspend-opp. If we uses the >>>new devfreq_suspend(), each devfreq device don't care >>>how to support the suspend-opp. Just the developer of each >>>devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. >> Why should support change the voltage in devfreq framework, i think it >> shuold be handle in >> specific driver, i think the devfreq only handle it can get the right >> frequency, then pass it to > > No, the frequency should be handled by governor or framework. > The each devfreq device has no any responsibility of next frequency/voltage. > The governor and core of devfreq can decide the next frequency/voltage. > You can refer to the cpufreq subsystem. > >> specific driver, i think the voltage should handle in the >> devfreq->profile->target(); > > The call of devfreq->profile->target() have to be handled by devfreq > framework. > If user want to set the suspend frequency, user can add the 'suspend-opp' > property. > It think this way is easy. > > But, > If the each devfreq device want to decide the next frequency/voltage only for > suspend state. We can check the cpufreq subsystem. > > If specific devfreq device want to handle the suspend frequency, > each devfreq will add the own suspend/resume functions as following: > > struct devfreq_dev_profile { > int (*suspend)(struct devfreq *dev);// new function pointer > int (*resume)(struct devfreq *dev); // new function pointer > } a_profile; > > a_profile = devfreq_generic_suspend; > > The devfreq framework will provide the devfreq_generic_suspend() > funticon. > int devfreq_generic_suspend(struce devfreq *dev) { > ... > devfreq->profile->target(..., devfreq->suspend_freq); > ... > } > > or > > a_profile = a_devfreq_suspend; // specific function of each devfreq > device > > The devfreq_suspend() will call 'devfreq->profile->suspend()' function > instead of devfreq->profile->target(); > > The devfreq call the 'devfreq->profile->suspend()' > to support the suspend frequency. > > Regards, > Chanwoo Choi The key difference between two approaches: Your approach: - The each developer should add the 'opp-suspend' property to the dts file. - The each devfreq should call the devfreq_suspend_device() to support the suspend frequency. If each devfreq doesn't call the devfreq_suspend_device(), devfreq framework can support the suspend frequency. Other approach: - The each developer only should add the 'opp-suspend' property to the dts file without the additional behavior. In the cpufreq subsystem, When support the suspend frequency of cpufreq, we just add 'opp-suspend' property without the additional behavior. Regards, Chanwoo Choi > >>> Best Regards, >>> Chanwoo Choi >>> so i think my way semm more simple. On 2016年11月24日 15:10, Chanwoo Choi wrote: > + Tobias Jakobi, > > Hi Lin, > > We need to discuss how to support the suspend-opp of devfreq device. > Now, there are two patch thread for suspend-opp of devfreq. > > The Lin's approach modify the devfreq_suspend_device() to support > suspend-opp. > The Tobias's approach[1] add new devfreq_suspend() and then call it on > dpm_suspend() > when entering the suspend state. > > [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl > - https://patchwork.kernel.org/patch/9443323/ > - https://patchwork.kernel.org/patch/9443325/ > - https://patchwork.kernel.org/patch/9443329/ > - https://patchwork.kernel.org/patch/9443331/ >
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Lin, On 2016년 11월 24일 17:34, hl wrote: > Hi Chanwoo Choi, > > > On 2016年11月24日 16:16, Chanwoo Choi wrote: >> Hi Lin, >> >> On 2016년 11월 24일 16:34, hl wrote: >>> Hi Chanwoo Choi, >>> >>> I think the dev_pm_opp_get_suspend_opp() have implement most of >>> the funtion, all we need is just define the node in dts, like following: >>> >>> _opp_table { >>> opp06 { >>> opp-suspend; >>> }; >>> }; >> Two approaches use the 'opp-suspend' property. >> >> I think that the method to support suspend-opp have to >> guarantee following conditions: >> - Support the all of devfreq's governors. > As MyungJoo Ham suggestion, i will set the suspend frequency in > devfreq_suspend_device(), > which will ingore governor. Other approach already support the all of governors. Before calling the mail, I discussed with Myungjoo Ham. Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). To Myungjoo, Please add your opinion how to support the suspend frequency. >> - Devfreq framework have the responsibility to change the >>frequency/voltage for suspend-opp. If we uses the >>new devfreq_suspend(), each devfreq device don't care >>how to support the suspend-opp. Just the developer of each >>devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. > Why should support change the voltage in devfreq framework, i think it shuold > be handle in > specific driver, i think the devfreq only handle it can get the right > frequency, then pass it to No, the frequency should be handled by governor or framework. The each devfreq device has no any responsibility of next frequency/voltage. The governor and core of devfreq can decide the next frequency/voltage. You can refer to the cpufreq subsystem. > specific driver, i think the voltage should handle in the > devfreq->profile->target(); The call of devfreq->profile->target() have to be handled by devfreq framework. If user want to set the suspend frequency, user can add the 'suspend-opp' property. It think this way is easy. But, If the each devfreq device want to decide the next frequency/voltage only for suspend state. We can check the cpufreq subsystem. If specific devfreq device want to handle the suspend frequency, each devfreq will add the own suspend/resume functions as following: struct devfreq_dev_profile { int (*suspend)(struct devfreq *dev);// new function pointer int (*resume)(struct devfreq *dev); // new function pointer } a_profile; a_profile = devfreq_generic_suspend; The devfreq framework will provide the devfreq_generic_suspend() funticon. int devfreq_generic_suspend(struce devfreq *dev) { ... devfreq->profile->target(..., devfreq->suspend_freq); ... } or a_profile = a_devfreq_suspend; // specific function of each devfreq device The devfreq_suspend() will call 'devfreq->profile->suspend()' function instead of devfreq->profile->target(); The devfreq call the 'devfreq->profile->suspend()' to support the suspend frequency. Regards, Chanwoo Choi >> Best Regards, >> Chanwoo Choi >> >>> so i think my way semm more simple. >>> >>> On 2016年11月24日 15:10, Chanwoo Choi wrote: + Tobias Jakobi, Hi Lin, We need to discuss how to support the suspend-opp of devfreq device. Now, there are two patch thread for suspend-opp of devfreq. The Lin's approach modify the devfreq_suspend_device() to support suspend-opp. The Tobias's approach[1] add new devfreq_suspend() and then call it on dpm_suspend() when entering the suspend state. [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl - https://patchwork.kernel.org/patch/9443323/ - https://patchwork.kernel.org/patch/9443325/ - https://patchwork.kernel.org/patch/9443329/ - https://patchwork.kernel.org/patch/9443331/ I think we need to discuss it together. Regards, Chanwoo Choi On 2016년 11월 24일 15:45, hl wrote: > Hi MyungJoo Ham, > > On 2016年11月24日 14:14, MyungJoo Ham wrote: >> On Thu, Nov 24, 2016 at 11:18 AM, hlwrote: >>> Hi MyungJoo Ham, >> [] We still need to sync the all status even i call target() in devfreq_suspend/resume_device directly, so still need update_devfreq() other setp except devfreq->governor->get_target_freq(devfreq, ); >>> And i think it better to be governor behaviors, for userspace they may >>> not >>> want to change >>> the suspend frequency like other governor, the frequency should decide >>> by >>> the user, if they >>> want this function, they should like other governor to rigister a >>> devfreq_monitor_suspend(). >>> What do you think about my rev6 patch? >>
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Lin, On 2016년 11월 24일 17:34, hl wrote: > Hi Chanwoo Choi, > > > On 2016年11月24日 16:16, Chanwoo Choi wrote: >> Hi Lin, >> >> On 2016년 11월 24일 16:34, hl wrote: >>> Hi Chanwoo Choi, >>> >>> I think the dev_pm_opp_get_suspend_opp() have implement most of >>> the funtion, all we need is just define the node in dts, like following: >>> >>> _opp_table { >>> opp06 { >>> opp-suspend; >>> }; >>> }; >> Two approaches use the 'opp-suspend' property. >> >> I think that the method to support suspend-opp have to >> guarantee following conditions: >> - Support the all of devfreq's governors. > As MyungJoo Ham suggestion, i will set the suspend frequency in > devfreq_suspend_device(), > which will ingore governor. Other approach already support the all of governors. Before calling the mail, I discussed with Myungjoo Ham. Myungjoo prefer to use the devfreq_suspend/devfreq_resume(). To Myungjoo, Please add your opinion how to support the suspend frequency. >> - Devfreq framework have the responsibility to change the >>frequency/voltage for suspend-opp. If we uses the >>new devfreq_suspend(), each devfreq device don't care >>how to support the suspend-opp. Just the developer of each >>devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. > Why should support change the voltage in devfreq framework, i think it shuold > be handle in > specific driver, i think the devfreq only handle it can get the right > frequency, then pass it to No, the frequency should be handled by governor or framework. The each devfreq device has no any responsibility of next frequency/voltage. The governor and core of devfreq can decide the next frequency/voltage. You can refer to the cpufreq subsystem. > specific driver, i think the voltage should handle in the > devfreq->profile->target(); The call of devfreq->profile->target() have to be handled by devfreq framework. If user want to set the suspend frequency, user can add the 'suspend-opp' property. It think this way is easy. But, If the each devfreq device want to decide the next frequency/voltage only for suspend state. We can check the cpufreq subsystem. If specific devfreq device want to handle the suspend frequency, each devfreq will add the own suspend/resume functions as following: struct devfreq_dev_profile { int (*suspend)(struct devfreq *dev);// new function pointer int (*resume)(struct devfreq *dev); // new function pointer } a_profile; a_profile = devfreq_generic_suspend; The devfreq framework will provide the devfreq_generic_suspend() funticon. int devfreq_generic_suspend(struce devfreq *dev) { ... devfreq->profile->target(..., devfreq->suspend_freq); ... } or a_profile = a_devfreq_suspend; // specific function of each devfreq device The devfreq_suspend() will call 'devfreq->profile->suspend()' function instead of devfreq->profile->target(); The devfreq call the 'devfreq->profile->suspend()' to support the suspend frequency. Regards, Chanwoo Choi >> Best Regards, >> Chanwoo Choi >> >>> so i think my way semm more simple. >>> >>> On 2016年11月24日 15:10, Chanwoo Choi wrote: + Tobias Jakobi, Hi Lin, We need to discuss how to support the suspend-opp of devfreq device. Now, there are two patch thread for suspend-opp of devfreq. The Lin's approach modify the devfreq_suspend_device() to support suspend-opp. The Tobias's approach[1] add new devfreq_suspend() and then call it on dpm_suspend() when entering the suspend state. [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl - https://patchwork.kernel.org/patch/9443323/ - https://patchwork.kernel.org/patch/9443325/ - https://patchwork.kernel.org/patch/9443329/ - https://patchwork.kernel.org/patch/9443331/ I think we need to discuss it together. Regards, Chanwoo Choi On 2016년 11월 24일 15:45, hl wrote: > Hi MyungJoo Ham, > > On 2016年11月24日 14:14, MyungJoo Ham wrote: >> On Thu, Nov 24, 2016 at 11:18 AM, hl wrote: >>> Hi MyungJoo Ham, >> [] We still need to sync the all status even i call target() in devfreq_suspend/resume_device directly, so still need update_devfreq() other setp except devfreq->governor->get_target_freq(devfreq, ); >>> And i think it better to be governor behaviors, for userspace they may >>> not >>> want to change >>> the suspend frequency like other governor, the frequency should decide >>> by >>> the user, if they >>> want this function, they should like other governor to rigister a >>> devfreq_monitor_suspend(). >>> What do you think about my rev6 patch? >> If I understand the
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Chanwoo Choi, On 2016年11月24日 16:16, Chanwoo Choi wrote: Hi Lin, On 2016년 11월 24일 16:34, hl wrote: Hi Chanwoo Choi, I think the dev_pm_opp_get_suspend_opp() have implement most of the funtion, all we need is just define the node in dts, like following: _opp_table { opp06 { opp-suspend; }; }; Two approaches use the 'opp-suspend' property. I think that the method to support suspend-opp have to guarantee following conditions: - Support the all of devfreq's governors. As MyungJoo Ham suggestion, i will set the suspend frequency in devfreq_suspend_device(), which will ingore governor. - Devfreq framework have the responsibility to change the frequency/voltage for suspend-opp. If we uses the new devfreq_suspend(), each devfreq device don't care how to support the suspend-opp. Just the developer of each devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. Why should support change the voltage in devfreq framework, i think it shuold be handle in specific driver, i think the devfreq only handle it can get the right frequency, then pass it to specific driver, i think the voltage should handle in the devfreq->profile->target(); Best Regards, Chanwoo Choi so i think my way semm more simple. On 2016年11月24日 15:10, Chanwoo Choi wrote: + Tobias Jakobi, Hi Lin, We need to discuss how to support the suspend-opp of devfreq device. Now, there are two patch thread for suspend-opp of devfreq. The Lin's approach modify the devfreq_suspend_device() to support suspend-opp. The Tobias's approach[1] add new devfreq_suspend() and then call it on dpm_suspend() when entering the suspend state. [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl - https://patchwork.kernel.org/patch/9443323/ - https://patchwork.kernel.org/patch/9443325/ - https://patchwork.kernel.org/patch/9443329/ - https://patchwork.kernel.org/patch/9443331/ I think we need to discuss it together. Regards, Chanwoo Choi On 2016년 11월 24일 15:45, hl wrote: Hi MyungJoo Ham, On 2016年11月24日 14:14, MyungJoo Ham wrote: On Thu, Nov 24, 2016 at 11:18 AM, hlwrote: Hi MyungJoo Ham, [] We still need to sync the all status even i call target() in devfreq_suspend/resume_device directly, so still need update_devfreq() other setp except devfreq->governor->get_target_freq(devfreq, ); And i think it better to be governor behaviors, for userspace they may not want to change the suspend frequency like other governor, the frequency should decide by the user, if they want this function, they should like other governor to rigister a devfreq_monitor_suspend(). What do you think about my rev6 patch? If I understand the intention correctly, this is for the stability of the device due to the behavior or bootloader/SoC-initializer, which has nothing to do with governors. Even if users are using userspace, as long as they set the custom frequencies lower than the default, they have the possibility of being unstable as ondemand is going to have. To reuse the update_devfreq() code, you may do something like: static int _update_freq(struct devfreq *devfreq, bool is_suspending) { /* original contents of update_freq with if statement with is_suspending wrapping get_target_freq */ } int update_freq(struct devfreq *devfreq) { return _update_freq(devfreq, false); } There should be other good non-invasive methods that are not governoe-specific as well. Thanks for your suggestion, i will update the new version soon. Cheers, MyungJoo ___ Linux-rockchip mailing list linux-rockc...@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip -- Lin Huang -- Lin Huang
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Chanwoo Choi, On 2016年11月24日 16:16, Chanwoo Choi wrote: Hi Lin, On 2016년 11월 24일 16:34, hl wrote: Hi Chanwoo Choi, I think the dev_pm_opp_get_suspend_opp() have implement most of the funtion, all we need is just define the node in dts, like following: _opp_table { opp06 { opp-suspend; }; }; Two approaches use the 'opp-suspend' property. I think that the method to support suspend-opp have to guarantee following conditions: - Support the all of devfreq's governors. As MyungJoo Ham suggestion, i will set the suspend frequency in devfreq_suspend_device(), which will ingore governor. - Devfreq framework have the responsibility to change the frequency/voltage for suspend-opp. If we uses the new devfreq_suspend(), each devfreq device don't care how to support the suspend-opp. Just the developer of each devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. Why should support change the voltage in devfreq framework, i think it shuold be handle in specific driver, i think the devfreq only handle it can get the right frequency, then pass it to specific driver, i think the voltage should handle in the devfreq->profile->target(); Best Regards, Chanwoo Choi so i think my way semm more simple. On 2016年11月24日 15:10, Chanwoo Choi wrote: + Tobias Jakobi, Hi Lin, We need to discuss how to support the suspend-opp of devfreq device. Now, there are two patch thread for suspend-opp of devfreq. The Lin's approach modify the devfreq_suspend_device() to support suspend-opp. The Tobias's approach[1] add new devfreq_suspend() and then call it on dpm_suspend() when entering the suspend state. [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl - https://patchwork.kernel.org/patch/9443323/ - https://patchwork.kernel.org/patch/9443325/ - https://patchwork.kernel.org/patch/9443329/ - https://patchwork.kernel.org/patch/9443331/ I think we need to discuss it together. Regards, Chanwoo Choi On 2016년 11월 24일 15:45, hl wrote: Hi MyungJoo Ham, On 2016年11月24日 14:14, MyungJoo Ham wrote: On Thu, Nov 24, 2016 at 11:18 AM, hl wrote: Hi MyungJoo Ham, [] We still need to sync the all status even i call target() in devfreq_suspend/resume_device directly, so still need update_devfreq() other setp except devfreq->governor->get_target_freq(devfreq, ); And i think it better to be governor behaviors, for userspace they may not want to change the suspend frequency like other governor, the frequency should decide by the user, if they want this function, they should like other governor to rigister a devfreq_monitor_suspend(). What do you think about my rev6 patch? If I understand the intention correctly, this is for the stability of the device due to the behavior or bootloader/SoC-initializer, which has nothing to do with governors. Even if users are using userspace, as long as they set the custom frequencies lower than the default, they have the possibility of being unstable as ondemand is going to have. To reuse the update_devfreq() code, you may do something like: static int _update_freq(struct devfreq *devfreq, bool is_suspending) { /* original contents of update_freq with if statement with is_suspending wrapping get_target_freq */ } int update_freq(struct devfreq *devfreq) { return _update_freq(devfreq, false); } There should be other good non-invasive methods that are not governoe-specific as well. Thanks for your suggestion, i will update the new version soon. Cheers, MyungJoo ___ Linux-rockchip mailing list linux-rockc...@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip -- Lin Huang -- Lin Huang
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Lin, On 2016년 11월 24일 16:34, hl wrote: > Hi Chanwoo Choi, > > I think the dev_pm_opp_get_suspend_opp() have implement most of > the funtion, all we need is just define the node in dts, like following: > > _opp_table { > opp06 { > opp-suspend; > }; > }; Two approaches use the 'opp-suspend' property. I think that the method to support suspend-opp have to guarantee following conditions: - Support the all of devfreq's governors. - Devfreq framework have the responsibility to change the frequency/voltage for suspend-opp. If we uses the new devfreq_suspend(), each devfreq device don't care how to support the suspend-opp. Just the developer of each devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. Best Regards, Chanwoo Choi > > so i think my way semm more simple. > > On 2016年11月24日 15:10, Chanwoo Choi wrote: >> + Tobias Jakobi, >> >> Hi Lin, >> >> We need to discuss how to support the suspend-opp of devfreq device. >> Now, there are two patch thread for suspend-opp of devfreq. >> >> The Lin's approach modify the devfreq_suspend_device() to support >> suspend-opp. >> The Tobias's approach[1] add new devfreq_suspend() and then call it on >> dpm_suspend() >> when entering the suspend state. >> >> [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl >> - https://patchwork.kernel.org/patch/9443323/ >> - https://patchwork.kernel.org/patch/9443325/ >> - https://patchwork.kernel.org/patch/9443329/ >> - https://patchwork.kernel.org/patch/9443331/ >> >> I think we need to discuss it together. >> >> Regards, >> Chanwoo Choi >> >> On 2016년 11월 24일 15:45, hl wrote: >>> Hi MyungJoo Ham, >>> >>> On 2016年11月24日 14:14, MyungJoo Ham wrote: On Thu, Nov 24, 2016 at 11:18 AM, hlwrote: > Hi MyungJoo Ham, [] >> We still need to sync the all status even i call target() in >> devfreq_suspend/resume_device >> directly, so still need update_devfreq() other setp except >> devfreq->governor->get_target_freq(devfreq, ); > And i think it better to be governor behaviors, for userspace they may not > want to change > the suspend frequency like other governor, the frequency should decide by > the user, if they > want this function, they should like other governor to rigister a > devfreq_monitor_suspend(). > What do you think about my rev6 patch? If I understand the intention correctly, this is for the stability of the device due to the behavior or bootloader/SoC-initializer, which has nothing to do with governors. Even if users are using userspace, as long as they set the custom frequencies lower than the default, they have the possibility of being unstable as ondemand is going to have. To reuse the update_devfreq() code, you may do something like: static int _update_freq(struct devfreq *devfreq, bool is_suspending) { /* original contents of update_freq with if statement with is_suspending wrapping get_target_freq */ } int update_freq(struct devfreq *devfreq) { return _update_freq(devfreq, false); } There should be other good non-invasive methods that are not governoe-specific as well. >>> Thanks for your suggestion, i will update the new version soon. Cheers, MyungJoo ___ Linux-rockchip mailing list linux-rockc...@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip >>> -- >>> Lin Huang >>> >> >> >> >
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Lin, On 2016년 11월 24일 16:34, hl wrote: > Hi Chanwoo Choi, > > I think the dev_pm_opp_get_suspend_opp() have implement most of > the funtion, all we need is just define the node in dts, like following: > > _opp_table { > opp06 { > opp-suspend; > }; > }; Two approaches use the 'opp-suspend' property. I think that the method to support suspend-opp have to guarantee following conditions: - Support the all of devfreq's governors. - Devfreq framework have the responsibility to change the frequency/voltage for suspend-opp. If we uses the new devfreq_suspend(), each devfreq device don't care how to support the suspend-opp. Just the developer of each devfreq device need to add 'opp-suspend' propet to OPP entry in DT file. Best Regards, Chanwoo Choi > > so i think my way semm more simple. > > On 2016年11月24日 15:10, Chanwoo Choi wrote: >> + Tobias Jakobi, >> >> Hi Lin, >> >> We need to discuss how to support the suspend-opp of devfreq device. >> Now, there are two patch thread for suspend-opp of devfreq. >> >> The Lin's approach modify the devfreq_suspend_device() to support >> suspend-opp. >> The Tobias's approach[1] add new devfreq_suspend() and then call it on >> dpm_suspend() >> when entering the suspend state. >> >> [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl >> - https://patchwork.kernel.org/patch/9443323/ >> - https://patchwork.kernel.org/patch/9443325/ >> - https://patchwork.kernel.org/patch/9443329/ >> - https://patchwork.kernel.org/patch/9443331/ >> >> I think we need to discuss it together. >> >> Regards, >> Chanwoo Choi >> >> On 2016년 11월 24일 15:45, hl wrote: >>> Hi MyungJoo Ham, >>> >>> On 2016年11月24日 14:14, MyungJoo Ham wrote: On Thu, Nov 24, 2016 at 11:18 AM, hl wrote: > Hi MyungJoo Ham, [] >> We still need to sync the all status even i call target() in >> devfreq_suspend/resume_device >> directly, so still need update_devfreq() other setp except >> devfreq->governor->get_target_freq(devfreq, ); > And i think it better to be governor behaviors, for userspace they may not > want to change > the suspend frequency like other governor, the frequency should decide by > the user, if they > want this function, they should like other governor to rigister a > devfreq_monitor_suspend(). > What do you think about my rev6 patch? If I understand the intention correctly, this is for the stability of the device due to the behavior or bootloader/SoC-initializer, which has nothing to do with governors. Even if users are using userspace, as long as they set the custom frequencies lower than the default, they have the possibility of being unstable as ondemand is going to have. To reuse the update_devfreq() code, you may do something like: static int _update_freq(struct devfreq *devfreq, bool is_suspending) { /* original contents of update_freq with if statement with is_suspending wrapping get_target_freq */ } int update_freq(struct devfreq *devfreq) { return _update_freq(devfreq, false); } There should be other good non-invasive methods that are not governoe-specific as well. >>> Thanks for your suggestion, i will update the new version soon. Cheers, MyungJoo ___ Linux-rockchip mailing list linux-rockc...@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip >>> -- >>> Lin Huang >>> >> >> >> >
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Chanwoo Choi, I think the dev_pm_opp_get_suspend_opp() have implement most of the funtion, all we need is just define the node in dts, like following: _opp_table { opp06 { opp-suspend; }; }; so i think my way semm more simple. On 2016年11月24日 15:10, Chanwoo Choi wrote: + Tobias Jakobi, Hi Lin, We need to discuss how to support the suspend-opp of devfreq device. Now, there are two patch thread for suspend-opp of devfreq. The Lin's approach modify the devfreq_suspend_device() to support suspend-opp. The Tobias's approach[1] add new devfreq_suspend() and then call it on dpm_suspend() when entering the suspend state. [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl - https://patchwork.kernel.org/patch/9443323/ - https://patchwork.kernel.org/patch/9443325/ - https://patchwork.kernel.org/patch/9443329/ - https://patchwork.kernel.org/patch/9443331/ I think we need to discuss it together. Regards, Chanwoo Choi On 2016년 11월 24일 15:45, hl wrote: Hi MyungJoo Ham, On 2016年11月24日 14:14, MyungJoo Ham wrote: On Thu, Nov 24, 2016 at 11:18 AM, hlwrote: Hi MyungJoo Ham, [] We still need to sync the all status even i call target() in devfreq_suspend/resume_device directly, so still need update_devfreq() other setp except devfreq->governor->get_target_freq(devfreq, ); And i think it better to be governor behaviors, for userspace they may not want to change the suspend frequency like other governor, the frequency should decide by the user, if they want this function, they should like other governor to rigister a devfreq_monitor_suspend(). What do you think about my rev6 patch? If I understand the intention correctly, this is for the stability of the device due to the behavior or bootloader/SoC-initializer, which has nothing to do with governors. Even if users are using userspace, as long as they set the custom frequencies lower than the default, they have the possibility of being unstable as ondemand is going to have. To reuse the update_devfreq() code, you may do something like: static int _update_freq(struct devfreq *devfreq, bool is_suspending) { /* original contents of update_freq with if statement with is_suspending wrapping get_target_freq */ } int update_freq(struct devfreq *devfreq) { return _update_freq(devfreq, false); } There should be other good non-invasive methods that are not governoe-specific as well. Thanks for your suggestion, i will update the new version soon. Cheers, MyungJoo ___ Linux-rockchip mailing list linux-rockc...@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip -- Lin Huang -- Lin Huang
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
Hi Chanwoo Choi, I think the dev_pm_opp_get_suspend_opp() have implement most of the funtion, all we need is just define the node in dts, like following: _opp_table { opp06 { opp-suspend; }; }; so i think my way semm more simple. On 2016年11月24日 15:10, Chanwoo Choi wrote: + Tobias Jakobi, Hi Lin, We need to discuss how to support the suspend-opp of devfreq device. Now, there are two patch thread for suspend-opp of devfreq. The Lin's approach modify the devfreq_suspend_device() to support suspend-opp. The Tobias's approach[1] add new devfreq_suspend() and then call it on dpm_suspend() when entering the suspend state. [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl - https://patchwork.kernel.org/patch/9443323/ - https://patchwork.kernel.org/patch/9443325/ - https://patchwork.kernel.org/patch/9443329/ - https://patchwork.kernel.org/patch/9443331/ I think we need to discuss it together. Regards, Chanwoo Choi On 2016년 11월 24일 15:45, hl wrote: Hi MyungJoo Ham, On 2016年11月24日 14:14, MyungJoo Ham wrote: On Thu, Nov 24, 2016 at 11:18 AM, hl wrote: Hi MyungJoo Ham, [] We still need to sync the all status even i call target() in devfreq_suspend/resume_device directly, so still need update_devfreq() other setp except devfreq->governor->get_target_freq(devfreq, ); And i think it better to be governor behaviors, for userspace they may not want to change the suspend frequency like other governor, the frequency should decide by the user, if they want this function, they should like other governor to rigister a devfreq_monitor_suspend(). What do you think about my rev6 patch? If I understand the intention correctly, this is for the stability of the device due to the behavior or bootloader/SoC-initializer, which has nothing to do with governors. Even if users are using userspace, as long as they set the custom frequencies lower than the default, they have the possibility of being unstable as ondemand is going to have. To reuse the update_devfreq() code, you may do something like: static int _update_freq(struct devfreq *devfreq, bool is_suspending) { /* original contents of update_freq with if statement with is_suspending wrapping get_target_freq */ } int update_freq(struct devfreq *devfreq) { return _update_freq(devfreq, false); } There should be other good non-invasive methods that are not governoe-specific as well. Thanks for your suggestion, i will update the new version soon. Cheers, MyungJoo ___ Linux-rockchip mailing list linux-rockc...@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip -- Lin Huang -- Lin Huang
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
+ Tobias Jakobi, Hi Lin, We need to discuss how to support the suspend-opp of devfreq device. Now, there are two patch thread for suspend-opp of devfreq. The Lin's approach modify the devfreq_suspend_device() to support suspend-opp. The Tobias's approach[1] add new devfreq_suspend() and then call it on dpm_suspend() when entering the suspend state. [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl - https://patchwork.kernel.org/patch/9443323/ - https://patchwork.kernel.org/patch/9443325/ - https://patchwork.kernel.org/patch/9443329/ - https://patchwork.kernel.org/patch/9443331/ I think we need to discuss it together. Regards, Chanwoo Choi On 2016년 11월 24일 15:45, hl wrote: > Hi MyungJoo Ham, > > On 2016年11月24日 14:14, MyungJoo Ham wrote: >> On Thu, Nov 24, 2016 at 11:18 AM, hlwrote: >>> Hi MyungJoo Ham, >> [] We still need to sync the all status even i call target() in devfreq_suspend/resume_device directly, so still need update_devfreq() other setp except devfreq->governor->get_target_freq(devfreq, ); >>> And i think it better to be governor behaviors, for userspace they may not >>> want to change >>> the suspend frequency like other governor, the frequency should decide by >>> the user, if they >>> want this function, they should like other governor to rigister a >>> devfreq_monitor_suspend(). >> >>> What do you think about my rev6 patch? >> If I understand the intention correctly, this is for the stability of >> the device due to the behavior or bootloader/SoC-initializer, which >> has nothing to do with governors. >> >> Even if users are using userspace, as long as they set the custom >> frequencies lower than the default, they have the possibility of >> being unstable as ondemand is going to have. >> >> >> To reuse the update_devfreq() code, you may do something like: >> >> static int _update_freq(struct devfreq *devfreq, bool is_suspending) >> { >> /* original contents of update_freq with if statement with is_suspending >> wrapping get_target_freq */ >> } >> int update_freq(struct devfreq *devfreq) >> { >> return _update_freq(devfreq, false); >> } >> >> >> There should be other good non-invasive methods that are not >> governoe-specific as well. >> > Thanks for your suggestion, i will update the new version soon. >> >> Cheers, >> MyungJoo >> >> >> >> >> ___ >> Linux-rockchip mailing list >> linux-rockc...@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-rockchip > > -- > Lin Huang >
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
+ Tobias Jakobi, Hi Lin, We need to discuss how to support the suspend-opp of devfreq device. Now, there are two patch thread for suspend-opp of devfreq. The Lin's approach modify the devfreq_suspend_device() to support suspend-opp. The Tobias's approach[1] add new devfreq_suspend() and then call it on dpm_suspend() when entering the suspend state. [1] [RFC 0/4] PM / devfreq: draft for OPP suspend impl - https://patchwork.kernel.org/patch/9443323/ - https://patchwork.kernel.org/patch/9443325/ - https://patchwork.kernel.org/patch/9443329/ - https://patchwork.kernel.org/patch/9443331/ I think we need to discuss it together. Regards, Chanwoo Choi On 2016년 11월 24일 15:45, hl wrote: > Hi MyungJoo Ham, > > On 2016年11月24日 14:14, MyungJoo Ham wrote: >> On Thu, Nov 24, 2016 at 11:18 AM, hl wrote: >>> Hi MyungJoo Ham, >> [] We still need to sync the all status even i call target() in devfreq_suspend/resume_device directly, so still need update_devfreq() other setp except devfreq->governor->get_target_freq(devfreq, ); >>> And i think it better to be governor behaviors, for userspace they may not >>> want to change >>> the suspend frequency like other governor, the frequency should decide by >>> the user, if they >>> want this function, they should like other governor to rigister a >>> devfreq_monitor_suspend(). >> >>> What do you think about my rev6 patch? >> If I understand the intention correctly, this is for the stability of >> the device due to the behavior or bootloader/SoC-initializer, which >> has nothing to do with governors. >> >> Even if users are using userspace, as long as they set the custom >> frequencies lower than the default, they have the possibility of >> being unstable as ondemand is going to have. >> >> >> To reuse the update_devfreq() code, you may do something like: >> >> static int _update_freq(struct devfreq *devfreq, bool is_suspending) >> { >> /* original contents of update_freq with if statement with is_suspending >> wrapping get_target_freq */ >> } >> int update_freq(struct devfreq *devfreq) >> { >> return _update_freq(devfreq, false); >> } >> >> >> There should be other good non-invasive methods that are not >> governoe-specific as well. >> > Thanks for your suggestion, i will update the new version soon. >> >> Cheers, >> MyungJoo >> >> >> >> >> ___ >> Linux-rockchip mailing list >> linux-rockc...@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-rockchip > > -- > Lin Huang >
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
On Thu, Nov 24, 2016 at 11:18 AM, hlwrote: > Hi MyungJoo Ham, [] >> >> We still need to sync the all status even i call target() in >> devfreq_suspend/resume_device >> directly, so still need update_devfreq() other setp except >> devfreq->governor->get_target_freq(devfreq, ); > > And i think it better to be governor behaviors, for userspace they may not > want to change > the suspend frequency like other governor, the frequency should decide by > the user, if they > want this function, they should like other governor to rigister a > devfreq_monitor_suspend(). > What do you think about my rev6 patch? If I understand the intention correctly, this is for the stability of the device due to the behavior or bootloader/SoC-initializer, which has nothing to do with governors. Even if users are using userspace, as long as they set the custom frequencies lower than the default, they have the possibility of being unstable as ondemand is going to have. To reuse the update_devfreq() code, you may do something like: static int _update_freq(struct devfreq *devfreq, bool is_suspending) { /* original contents of update_freq with if statement with is_suspending wrapping get_target_freq */ } int update_freq(struct devfreq *devfreq) { return _update_freq(devfreq, false); } There should be other good non-invasive methods that are not governoe-specific as well. Cheers, MyungJoo
Re: [PATCH v1 & v6 1/2] PM/devfreq: add suspend frequency support
On Thu, Nov 24, 2016 at 11:18 AM, hl wrote: > Hi MyungJoo Ham, [] >> >> We still need to sync the all status even i call target() in >> devfreq_suspend/resume_device >> directly, so still need update_devfreq() other setp except >> devfreq->governor->get_target_freq(devfreq, ); > > And i think it better to be governor behaviors, for userspace they may not > want to change > the suspend frequency like other governor, the frequency should decide by > the user, if they > want this function, they should like other governor to rigister a > devfreq_monitor_suspend(). > What do you think about my rev6 patch? If I understand the intention correctly, this is for the stability of the device due to the behavior or bootloader/SoC-initializer, which has nothing to do with governors. Even if users are using userspace, as long as they set the custom frequencies lower than the default, they have the possibility of being unstable as ondemand is going to have. To reuse the update_devfreq() code, you may do something like: static int _update_freq(struct devfreq *devfreq, bool is_suspending) { /* original contents of update_freq with if statement with is_suspending wrapping get_target_freq */ } int update_freq(struct devfreq *devfreq) { return _update_freq(devfreq, false); } There should be other good non-invasive methods that are not governoe-specific as well. Cheers, MyungJoo