Other Parts Discussed in Thread: TUSB8043
Hello，
One customer met a question about TUSB8043A as following:
According to the data manual of TUSB8043A, TUSB8043A is a 4-port hub, but now our device has detected 5 ports. So I want to ask what might be the cause?
The detailed application is that as they connected many USB devices, so the HUB root connected TUSB8043, but he found that the TUSB8043 detected five ports by the log of kernel. Now the UVC device which connected TUSB8043 couldn't work normally. By the log, usb_set_interface appears error and the return value is -71 when UVC initializes.
kernel log：
[2023-02-13 22:00:08.937674] INFO kernel:hub 3-1:1.0: USB hub found
[2023-02-13 22:00:08.937755] INFO kernel:hub 3-1:1.0: 5 ports detected
[2023-02-13 22:00:08.937769] INFO kernel:hub 3-1:1.0: compound device; port removable status: RRRRF
[2023-02-13 22:00:08.937778] INFO kernel:hub 3-1:1.0: individual port power switching
[2023-02-13 22:00:08.937791] INFO kernel:hub 3-1:1.0: individual port over-current protection
[2023-02-13 22:00:08.969564] INFO kernel:hub 3-1:1.0: TT per port
[2023-02-13 22:00:08.969581] INFO kernel:hub 3-1:1.0: TT requires at most 8 FS bit times (666 ns)
[2023-02-13 22:00:08.969593] INFO kernel:hub 3-1:1.0: power on to power good time: 100ms
[2023-02-13 22:00:08.969706] INFO kernel:hub 3-1:1.0: local power source is good
[2023-02-13 22:00:08.970251] INFO kernel:hub 3-1:1.0: enabling power on all ports
[2023-02-13 22:00:09.046183] INFO kernel:usb 4-1: new SuperSpeed USB device number 2 using xhci-hcd
[2023-02-13 22:00:09.066310] INFO kernel:usb 3-1-port2: status 0101 change 0001
[2023-02-13 22:00:09.066342] WARNING kernel:usb 4-1: usb_device_supports_lpm: quirks: USB_QUIRK_NO_LPM
[2023-02-13 22:00:09.066464] INFO kernel:usb 4-1: udev 2, busnum 4, minor = 385
[2023-02-13 22:00:09.066476] INFO kernel:usb 4-1: New USB device found, idVendor=0451, idProduct=8340
[2023-02-13 22:00:09.066483] INFO kernel:usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[2023-02-13 22:00:09.066788] INFO kernel:usb 3-1-port5: status 0101 change 0001
Best regards
kailyn
