On Sun, Mar 29, 2020 at 11:16 AM Rafael J. Wysocki <rafael@xxxxxxxxxx> wrote: > [cut] > > > > But if SMART_SUSPEND is set and the device is runtime-suspended, why > > issue the ->suspend callback? > > The driver itself or the middle-layer may want to resume the device. > > Arguably, it may do that in ->prepare() too, Not really. The problem is that that device_prepare() is executed synchronously for all devices, so if multiple devices needed to be resumed, the latency would accumulate if that happened in device_prepare(). Cheers!
