On Thu, Jun 06, 2024, Mike Looijmans wrote: > On 06-06-2024 02:28, Thinh Nguyen wrote: > > On Wed, Jun 05, 2024, Mike Looijmans wrote: > > > On 05-06-2024 01:06, Thinh Nguyen wrote: > > > > 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://urldefense.com/v3/__https://docs.kernel.org/driver-api/usb/dwc3.html*required-information__;Iw!!A4F2R9G_pg!bahfjil5HEUq-fOHAwDfusutLJCLognfyLHTFLiSlVuZotpr99XBGg7nB0zRRnNF_M1pqEKcVa4KxNJwh3_F2dZWwVKTkUY$ > > > I've attached the traces as a tarball. Hope it survives. > > Got them. Thanks. > > > > > At the start, the USB is up and running (and doing ethernet+mass storage). I > > > saved the trace after pulling the USB cable. > > > > > From the capture, we can see that there's no system suspend, so there's > > no soft-disconnect. > > > > Base on the suspend event, you're running in usb2 speed (ignore the > > incorrect U3 state, should be L2): > > > > irq/94-dwc3-631 [000] D..1. 149.139290: dwc3_event: event (00030601): Suspend [U3] > > > > The DSTS from the regdump indicated that you're still in L2 despite > > disconnected. Looks like the phy was unable to detect and wakeup from > > the disconnection to notify the controller. > > > > Can you experiment with setting "snps,dis_u2_susphy_quirk" to disable > > usb2 phy suspend. > > Adding snps,dis_u2_susphy_quirk doesn't make a difference, behavior is > identical. > > > > > > Does your device support SuperSpeed? If so, do you observe the same > > behavior while operating in SuperSpeed? > > Just checked, still connects with superspeed. What led you to think it was > only high speed? > Bit(4) of event info (0003) from device event value (00030601) indicates usb2 speed. Register DSTS field 2:0 indicates fullspeed. Even though this was captured after disconnection, the linkstate did not change, which led me to think that the connected speed did not change to Es.Disable either. > Do you want me to send new traces? > Can you also try to disable usb3 phy suspend with "snps,dis_u3_susphy_quirk" if you think it's connected in SuperSpeed? Please capture the traces again if it's operating in SuperSpeed. Thanks, Thinh
