On Tue, Apr 11, 2023 at 9:55 PM Alan Stern stern@rowland.harvard.edu wrote:
On Tue, Apr 11, 2023 at 08:31:45AM +0000, Jimmy Hu wrote:
The VIA VL813 USB3.0 hub appears to have an issue with autosuspend and detecting USB3 devices. This can be reproduced by connecting a USB3 device to the hub after the hub enters autosuspend mode.
//connect the hub [ 106.854204] usb 2-1: new SuperSpeed Gen 1 USB device number 2 using xhci-hcd [ 107.084993] usb 2-1: New USB device found, idVendor=2109, idProduct=0813, bcdDevice=90.15 [ 107.094520] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 107.111836] usb 2-1: Product: USB3.0 Hub [ 107.116835] usb 2-1: Manufacturer: VIA Labs, Inc. [ 107.314230] hub 2-1:1.0: USB hub found [ 107.321356] hub 2-1:1.0: 4 ports detected
//the hub enters autosuspend mode [ 107.738873] hub 2-1:1.0: hub_suspend [ 107.922097] usb 2-1: usb auto-suspend, wakeup 1
//connect a USB3 device [ 133.120060] usb 2-1: usb wakeup-resume [ 133.160033] usb 2-1: Waited 0ms for CONNECT [ 133.165423] usb 2-1: finish resume [ 133.176919] hub 2-1:1.0: hub_resume [ 133.188026] usb 2-1-port3: status 0263 change 0041 [ 133.323585] hub 2-1:1.0: state 7 ports 4 chg 0008 evt 0008 [ 133.342423] usb 2-1-port3: link state change [ 133.358154] usb 2-1-port3: status 0263, change 0040, 5.0 Gb/s
This status value indicates that the port is in the U3 suspend state. Maybe the port needs to be put back into U0 before it can be reset.
[ 133.875150] usb 2-1-port3: not reset yet, waiting 10ms [ 133.895502] usb 2-1-port3: not reset yet, waiting 10ms [ 133.918239] usb 2-1-port3: not reset yet, waiting 200ms [ 134.139529] usb 2-1-port3: not reset yet, waiting 200ms [ 134.365296] usb 2-1-port3: not reset yet, waiting 200ms [ 134.590185] usb 2-1-port3: not reset yet, waiting 200ms [ 134.641330] hub 2-1:1.0: state 7 ports 4 chg 0000 evt 0008 [ 134.658880] hub 2-1:1.0: hub_suspend [ 134.792908] usb 2-1: usb auto-suspend, wakeup 1
Disabling autosuspend for this hub resolves the issue.
It may be possible to fix the problem. You should try that before giving up.
Alan Stern
[ 133.120060] usb 2-1: usb wakeup-resume [ 133.160033] usb 2-1: Waited 0ms for CONNECT [ 133.165423] usb 2-1: finish resume [ 133.176919] hub 2-1:1.0: hub_resume When a USB3 device is connected to the hub, it did finish the resume and should be put back into U0, but it seems to have failed.