Hi Jun Sun, On 12/8/2017 17:33, Jun Sun wrote: > Hi, all, > > I have a raspberry pi zero w board and I'm currently configuring the > device as USB gadget and connects it to PC. > > I'm using configfs/functionfs to send a vendor specific interface with > single buik in and bulk out endpoint each. > > When I unplug the USB cable, there is no DISABLE event generated on > ep0 until next time the cable is re-plugged in again, right before the > next ENABLE event. Obviously this is not very useful as I really need > to know exactly when a unpllugging is happening. > > You can see a debugging trace below. > > After looking around, I finally got it working by the attached patch. > However, I have very little confidence in the patch itself. Would > appreciate any feedback on the issue and the correct fix. > > Cheers. > > Jun > > <unplug USB> > <replug USB> > > [ 130.406932] ffs_epfile_io_complete() > [ 130.406964] ====== JSUN ====== ffs_func_disable() called > [ 130.406980] __ffs_event_add(DISABLE) > [ 130.406991] adding event 3 > [ 130.435178] ffs_epfile_release() > [ 130.435193] ffs_data_closed() > [ 130.435199] ffs_data_put() > [ 130.435325] ffs_epfile_release() > [ 130.435333] ffs_data_closed() > [ 130.435338] ffs_data_put() > [ 130.435758] ffs_ep0_read() > [ 130.461705] dwc2 20980000.usb: new device is high-speed > [ 130.554583] dwc2 20980000.usb: new device is high-speed > [ 130.591376] dwc2 20980000.usb: new address 17 > [ 130.827451] dwc2 20980000.usb: new device is high-speed > [ 130.918627] dwc2 20980000.usb: new device is high-speed > [ 130.962062] dwc2 20980000.usb: new address 18 > [ 131.152381] dwc2 20980000.usb: new device is high-speed > [ 131.243481] dwc2 20980000.usb: new device is high-speed > [ 131.285993] dwc2 20980000.usb: new address 19 > [ 131.461014] configfs-gadget gadget: high-speed config #1: c > [ 131.461057] __ffs_event_add(ENABLE) > [ 131.461066] adding event 2 > [ 131.464892] ffs_epfile_open() > [ 131.464908] ffs_data_opened() > [ 131.465261] ffs_epfile_open() > [ 131.465272] ffs_data_opened() > [ 131.488760] ffs_epfile_read_iter() > [ 131.488835] ffs_ep0_read() > > <unplug USB> > <replug USB> > > [ 151.214987] ffs_epfile_io_complete() > [ 151.215020] ====== JSUN ====== ffs_func_disable() called > [ 151.215038] __ffs_event_add(DISABLE) > [ 151.215048] adding event 3 > [ 151.246561] ffs_epfile_release() > [ 151.246577] ffs_data_closed() > [ 151.246583] ffs_data_put() > [ 151.247797] ffs_epfile_release() > [ 151.247811] ffs_data_closed() > [ 151.247817] ffs_data_put() > [ 151.248227] ffs_ep0_read() > [ 151.269764] dwc2 20980000.usb: new device is high-speed > [ 151.363232] dwc2 20980000.usb: new device is high-speed > [ 151.400091] dwc2 20980000.usb: new address 20 > [ 151.638217] dwc2 20980000.usb: new device is high-speed > [ 151.729145] dwc2 20980000.usb: new device is high-speed > [ 151.773919] dwc2 20980000.usb: new address 21 > [ 151.962998] dwc2 20980000.usb: new device is high-speed > [ 152.054036] dwc2 20980000.usb: new device is high-speed > [ 152.096922] dwc2 20980000.usb: new address 22 > [ 152.267818] configfs-gadget gadget: high-speed config #1: c > [ 152.267863] __ffs_event_add(ENABLE) > [ 152.267874] adding event 2 > [ 152.273430] ffs_epfile_open() > [ 152.273446] ffs_data_opened() > [ 152.273811] ffs_epfile_open() > [ 152.273822] ffs_dat[ 152.296847] ffs_epfile_read_iter() > [ 152.296921] ffs_ep0_read() > [ 251.986224] random: crng init done > Please try to apply those patches. Please tell me does they fix your issue or not? [PATCH v2 0/3] dwc2 fixes for edge cases on hikey [PATCH 1/3 v2] usb: dwc2: Improve gadget state disconnection handling [PATCH 2/3 v2] usb: dwc2: Error out of dwc2_hsotg_ep_disable() if we're in host mode [PATCH 3/3 v2] usb: dwc2: Fix UDC state tracking You can find this patches on lkml. Submitted by John Stultz. Thanks, Grigor. -- 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
