Hi, On Tue, Jun 04, 2024, Mike Looijmans wrote: > On 04-06-2024 03:03, Thinh Nguyen wrote: > > Hi, > > > > On Mon, Jun 03, 2024, Mike Looijmans wrote: > > > When disconnecting the USB cable on an LS1028 device, nothing happens > > > in userspace, which keeps thinking everything is still up and running. > > > Turns out that the DWC3 controller only sends DWC3_DEVICE_EVENT_SUSPEND > > > in that case, and not a DWC3_DEVICE_EVENT_DISCONNECT as one would > > > expect. As a result, sysfs attribute "state" remains "configured" > > > until something resets it. > > > > > > Forward the "suspended" state to sysfs, so that the "state" at least > > > changes into "suspended" when one removes the cable, and hence also > > > matches the gadget's state when really suspended. > > On disconnection, did you see disconnect interrupt? If so, it should > > transition to USB_STATE_NOATTACHED. This change doesn't seem to directly > > address your issue. Can you provide the driver tracepoints? > > The device doesn't issue a disconnect event, I didn't have tracing enabled > in the kernel but added some dev_info() calls to determine what was going > on. Added this to dwc3_process_event_entry(): > > dev_info(dwc->dev, "event: 0x%x type=0x%x", event->raw, event->type.type); > > When disconnecting the cable from the host, I see this: > > [ 50.841411] dwc3 3110000.usb: event: 0x6084 type=0x42 > [ 50.841457] dwc3 3110000.usb: event: 0x4086 type=0x43 > [ 50.841494] dwc3 3110000.usb: event: 0x6084 type=0x42 > [ 50.841534] dwc3 3110000.usb: event: 0x4086 type=0x43 > [ 50.841571] dwc3 3110000.usb: event: 0x4086 type=0x43 > [ 52.650990] dwc3 3110000.usb: event: 0x30601 type=0x0 > > The "0x4086" and "0x6084" messages are endpoint events that occur all the > time while connected. The last event is the "suspend" one. After that, total > silence. > > If you need traces, please point me to a description on how to obtain them. > > Let me know if you run into issues following this instructions to capture the tracepoints: https://docs.kernel.org/driver-api/usb/dwc3.html#required-information
