On Thu, 3 Dec 2009, Oliver Neukum wrote: > An evil thought, do we have devices that will always request remote wakeup, > without an option to switch it off? What about OTG? I don't know of any such devices. USB OTG will depend on the controller design, but I would be surprised to find a controller that didn't let you turn off wakeup-IRQ generation. > > There's yet another issue to discuss. Suppose a device is > > runtime-suspended when a system sleep starts. When the system wakes > > up, should the device be runtime-resumed? (Assume that the wakeup > > settings don't differ; otherwise it has to be.) > > That depends on how sure we are to never drop a remote wakeup, > not even if requests race or for any other reason. And we must always > know what woke us up. This is a complicated question and I will discuss it at greater length in another email. However, I don't see any reason to know what woke us up. All we really need to know is what devices have wakeup requests outstanding when the system resume is finished. It doesn't matter which request came first (presumably that was the one which woke us up). Alan Stern _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
