Hi linux-usb members! I was looking at seeing how the DWC3 drivers are handling the USB cable disconnect routine (VBUS low situation) when there is no UDC binded. Is the below behavior expected? 1. Enumerate device w/ host. 2. Gadget is unbinded - echo "" > /sys/kernel/config/usb_gadget/g1/UDC 3. Disconnect the USB cable (VBUS low) 4. No dwc3_gadget_disconnect_interrupt() seen (since controller is halted from step#1) 5. Runtime PM autosuspend fails due to "dwc->connected" being true (cleared in dwc3_gadget_disconnect_interrupt()) 6. Gadget binded - echo udc_name > /sys/kernel/config/usb_gadget/g1/UDC 7. No runtime suspend until cable is plugged in and out This would be problematic for devices which have to reliably enter suspend. I just wanted to see if this is a scenario which has been considered? Seems odd that we would still keep the controller out of low power if there was no cable connected. Thanks Regards, Wesley Cheng -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
