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Hi Alan, I have seen in run time power management helper functions. I have some questions during deep sleep modes and runtime sleep modes. 1) I have seen the code and found that when System wants to go to suspend (deep sleep mode), it has to check for pm_runtime_barrier which inturn sees if there is a pending runtime resume then it will not allow system to supend. So it means system suspend can not be done forcefully if the some peripheral jobs are running, correct? 2) it means when System deep sleep is going on, run time suspend will never come to peripheral as it checks for usage counter and if it is zero then it will ask try again. 3) if run time suspend is going on, Then if system wants to go into deep sleep mode, it will wait for run time suspend to finish and then gracefully do the shutdown. correct? 4) Is it mandatory for peripheral driver but not the bus driver to implement runtime_idle operation? RegardsRaj > Date: Wed, 30 Jun 2010 12:25:21 -0400 > From: stern@xxxxxxxxxxxxxxxxxxx > To: rajkumar278@xxxxxxxxxxx > CC: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx > Subject: RE: [linux-pm] About run time power management in linux > > On Wed, 30 Jun 2010, Raj Kumar wrote: > > > Hi Alan, > > > > > > > > First thanks for reply. ok as also seems to be in runtime.c, if device wants to suspend and resume > > > > > > > > then device will call helper functions for pm core like pm_runtime_suspend and pm_runtime_resume, > > > > > > > > which internally calls the runtime_resume of the bus and which in turn calls the runtime_resume of the driver. > > > > > > > > correct ? > > Yes. > > Alan Stern > |
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