On Tue, 21 Dec 2010, Kevin Hilman wrote: > That being said, another thing we discussed briefly at LPC was wondering > about reason(s) behind the DPM core locking out runtime PM transitions > in the first place. The reason is to prevent confusion from unwanted runtime-PM state changes during a system sleep transition. > Currently runtime PM transitions are blocked in dpm_prepare() and only > allowed again in dpm_complete(). How about locking out runtime PM > transitions only until the DPM suspend operation is complete. IOW, > rather than waiting for dpm_complete() to re-allow runtime PM > transitions, what about allowing them after dpm_suspend()? I haven't > actually tested this yet, since I'm busy with getting OMAP PM stuff > ready for the merge window, so it's just and idea so far. Of course > similar will be needed to block runtime PM transitions during > dpm_resume(). That would defeat the purpose. We need to prevent unwanted state changes during the entire sleep transition, not just during the time that dpm_suspend is running. Alan Stern _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
