On Wed, 23 Mar 2011, jacob pan wrote: > Hi, > > I have a dumb question about enabling EHCI runtime PM with PCI > subsystem. It seems core code in hci-pci.c provides the runtime call > backs in usb_hcd_pci_pm_ops. But I don't see that being used in case of > EHCI suspend/resume. > > I must have missed something, can someone explain how this should work? > > On our platform, we need to put EHCI in PCI D0i3 hot when we suspend > root hub so that the block can be put into low power mode. I guess we > also need platform specific functions to set the PCI Dx state during > runtime suspend. No. As Ming explained, you only need to enable runtime PM for the controller. For example: echo auto >/sys/bus/pci/devices/0000:00:1d.7/power/control Substitute the appropriate device name in the path above. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
