We use a lot of usb devices in a TX2 based system, it appears the xhci-tegra driver suffers from the same limit as the intel implementation did where more than 20 devices and no more are allowed. http://marc.merlins.org/perso/linux/post_2018-12-20_Getting-Around-USB3-xhci-32-Device-Limit-Max-number…

Hi, It is limitation of xhci controller. You may extend it by using PCIe to USB adapter, but please note there can also be EP limitation on the adapter.

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DaneLLL July 10, 2019, 5:44am 2

Hi,
There is a hardware limitation: EP(end point) <= 70, i.e., SS+HS+FS+LS EPs <= 70.

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