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Part Number: TUSB7340
Support Path: /Product/Development and troubleshooting/
I'm experiencing some problems with USB2.0 (and lower) peripherals attached to the TUSB7340 USB3.0 xHCI host controller ports. The hardware platform is a custom board based on Xilinx Zynq UltraScale+ MPSoC (7EV family) with PCIe root complex enabled within the Processing System (x1 link at 5 Gb/s). The USB3.0 devices (hub/storage) work just fine, but the slower ones are not enabled/present in the system. Linux kernel version is v4.9 (xilinx rel-2017.3) with xhci-hcd driver used for USB3.0 host (arm64/xilinx_zynqmp_defconfig). Output from lspci and lsusb tools is provided below:
00:00.0 PCI bridge: Xilinx Corporation Device 7012 (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0, IRQ 255 Memory at e0100000 (32-bit, prefetchable) [size=8K] Bus: primary=00, secondary=01, subordinate=0c, sec-latency=0 I/O behind bridge: 00000000-00000fff Memory behind bridge: e0000000-e00fffff Capabilities:  Power Management version 3 Capabilities:  Express Root Port (Slot-), MSI 00 Capabilities:  Device Serial Number 00-00-00-00-00-00-00-00 Capabilities: [10c] Virtual Channel Capabilities:  Vendor Specific Information: ID=1234 Rev=1 Len=018 <?>01:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI Host Controller (rev 02) (prog-if 30 [XHCI]) Flags: bus master, fast devsel, latency 0, IRQ 54 Memory at e0000000 (64-bit, non-prefetchable) [size=64K] Memory at e0010000 (64-bit, non-prefetchable) [size=8K] Capabilities:  Power Management version 3 Capabilities:  MSI: Enable+ Count=1/8 Maskable- 64bit+ Capabilities:  Express Endpoint, MSI 00 Capabilities: [c0] MSI-X: Enable- Count=8 Masked- Capabilities:  Advanced Error Reporting Capabilities:  Device Serial Number 08-00-28-00-00-20-00-00 Kernel driver in use: xhci_hcd
:~# lsusb -t/: Bus 02.Port 1: Dev 1, class="root_hub", Driver=xhci_hcd/4p, 5000M/: Bus 01.Port 1: Dev 1, class="root_hub", Driver=xhci_hcd/4p, 480M
There is completely no kernel messages produced when keyboard or mouse are attached, but in case of usb storage/hub I can see some kernel output attaching to 2 of 4 available ports like that:
[ 3.440737] usb 1-2: new high-speed USB device number 2 using xhci_hcd[ 3.680735] usb 1-2: new high-speed USB device number 3 using xhci_hcd[ 4.115517] usb 1-2: new high-speed USB device number 4 using xhci_hcd[ 4.122036] usb 1-2: Device not responding to setup address.[ 4.332804] usb 1-2: Device not responding to setup address.[ 4.544763] usb 1-2: device not accepting address 4, error -71[ 4.668759] usb 1-2: new high-speed USB device number 5 using xhci_hcd[ 4.676095] usb 1-2: Device not responding to setup address.[ 4.888798] usb 1-2: Device not responding to setup address.[ 5.100758] usb 1-2: device not accepting address 5, error -71[ 5.111658] usb usb1-port2: unable to enumerate USB device
As reference, we have another one board with TUSB7320 host (yes, slightly different part with 2 ports only) based on Xilinx Zynq-7000 chip with PCIe root subsystem enabled in the FPGA fabric running on the same Linux kernel (built for armv7/xilinx_zynq_defconfig) with the same xhci-hcd driver used. And in this case no issues are reported: all kinds of USB peripherals work well. From system point of view, the only difference in USB3.0 design between these 2 boards lies in PCIe root complex implementation: "soft" IP for Zynq-7000 vs. "hardened" block for Zynq US+ MPSoC. The Linux drivers for these 2 PCIe hosts are also different: pcie-xilinx.c for soft PCIe host vs. pcie-xilinx-nwl.c for the integrated version in MPSoC chip. The configuration parameters for the both PCIe hosts are absolutely the same.
Do you have any thoughts on this?
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