On Wed, 8 Feb 2012, Felipe Balbi wrote: > Just keep in mind that glue layer also needs to keep track of its own > usage counters, what I mean by that, is that on dwc3-pci probe you > should probably call pm_runtime_get_sync() and right before returning > from probe, you call pm_runtime_put(). This will make sure that the PCIe > device is powered up when you need and can be autosuspended when you > don't need it anymore. Runtime PM for PCI devices uses a slightly different scheme. The PCI core increments the usage counter when a PCI device is first probed, and doesn't decrement the counter until the device is removed. This helps drivers without runtime PM support; the device will never be autosuspended. As a result, if a PCI driver does support autosuspend, it doesn't need to make any special calls in its probe and remove routines. It just has to call pm_runtime_put[_sync] when not using the device and pm_runtime_get[_sync] when ready to start using it again. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
