Several years ago runtime PM was merged to the kernel. Even if drivers and subsystems benefit of using it, there are still unresolved issues we need to address, especially when runtime PM is combined with system PM.
This session is not available as an online video.
Link to Etherpad: http://pad.linaro.org/p/LCA14-407
Link to Presentation: http://www.linaro.org/documents/download/48928de6fc23a159f8dff9533e47390053169afb12c67