On 04/25/2012 01:58 PM, Alan Stern wrote: > This patch (as1547) rearranges the Power Management parts of the > ehci-tegra driver to match the conventions used in other EHCI platform > drivers. In particular, the controller should not be powered down by > the root hub's suspend routine; the controller's power level should be > managed by the controller's own PM methods. > > The end result of the patch is that the standard ehci_bus_suspend() > and ehci_bus_resume() methods can be used instead of special-purpose > routines. The driver now uses the standard dev_pm_ops methods instead > of legacy power management. Since there is no supported wakeup > mechanism for the controller, runtime suspend is forbidden by default > (this can be overridden via sysfs, if desired). > > These adjustments are needed in order to make ehci-tegra compatible > with recent changes to the USB core. The core now checks the root > hub's status following bus suspend; if the controller is automatically > powered down during bus suspend then the check will fail and the root > hub will be resumed immediately. Doing the controller power-down in a > separate method avoids this problem. Acked-by: Stephen Warren <swarren@xxxxxxxxxxxxx> Tested-by: Stephen Warren <swarren@xxxxxxxxxxxxx> -- 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
