Hello, https://bugzilla.kernel.org/buglist.cgi?quicksearch=uPD72020&list_id=1019103 reveals a whole list of 'NEW'-state bugs for this chip. The mileage varies, but here is a detailed description of the issue I face on laptop with ECUSB3S254F from StarTech:
https://www.startech.com/Cards-Adapters/USB-3.0/Cards/2-Port-Flush-Mount-USB-3-ExpressCard-Adapter~ECUSB3S254F The system is running GNU/Gentoo Linux with kernel 5.0.3, same problem was observed with kernel 4.19.27 for a reference. Most of the bugs mentioned in the bugzilla list from the start of the email exist, however I manage to workaround them by simply telling the PCI bus to remove the ID and/or rescan for new devices. Commands to use: echo 1 > /sys/bus/pci/devices/0000\:04\:00.0/remove echo 1 > /sys/bus/pci/rescan When a single USB port is in use, chances are that the device will just work(though sometimes IO subsystem to the connected USB device may just hang, but this is for another time). However, if you plug in two USB devices, say two USB sticks or disks, then it fails to work. [ 136.136819] xhci_hcd 0000:04:00.0: xHCI host controller not responding, assume dead [ 136.136836] xhci_hcd 0000:04:00.0: HC died; cleaning up or [ 341.214239] xhci_hcd 0000:04:00.0: remove, state 1 [ 341.214258] usb usb4: USB disconnect, device number 1 [ 341.214801] xhci_hcd 0000:04:00.0: USB bus 4 deregistered [ 341.214956] xhci_hcd 0000:04:00.0: remove, state 4 [ 341.214968] usb usb3: USB disconnect, device number 1 [ 341.216006] xhci_hcd 0000:04:00.0: Host halt failed, -19 [ 341.216016] xhci_hcd 0000:04:00.0: Host not accessible, reset failed. [ 341.216480] xhci_hcd 0000:04:00.0: USB bus 3 deregistered Power issues I rule out, as I have provided auxiliary external source of 5V and more than enough AMPs, so the controller should be able to feed the needed. Also it happens with USB sticks, which do not draw a lot of AMPs. Here is the controller as reported by lspci -nn: 04:00.0 USB controller [0c03]: Renesas Technology Corp. uPD720202 USB 3.0 Host Controller [1912:0015] (rev 02) and the verbose output of lspci attached to the email. lsusb -t: /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M (UAS kernel module is also available, but I believe a kernel quirk disables it for this controller/disk), thus it falls back to usb-storage, which is ok. Any hope to get this to behave under Linux? The vendor only lists Windows as a supported OS, however it seems like the linux driver is almost there too... Any pointers/patches/suggestions are welcome. I did not open a separate bug for this, as there are too many 'NEW' already. Thank you, -Nikolay
04:00.0 USB controller: Renesas Technology Corp. uPD720202 USB 3.0 Host
Controller (rev 02) (prog-if 30 [XHCI])
Subsystem: Renesas Technology Corp. uPD720202 USB 3.0 Host Controller
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 18
Region 0: Memory at e5b00000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [50] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [90] MSI-X: Enable+ Count=8 Masked-
Vector table: BAR=0 offset=00001000
PBA: BAR=0 offset=00001080
Capabilities: [a0] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s
unlimited, L1 unlimited
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
SlotPowerLimit 0.000W
DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr+ UncorrErr+ FatalErr- UnsuppReq+ AuxPwr+
TransPend-
LnkCap: Port #0, Speed 5GT/s, Width x1, ASPM L0s L1, Exit
Latency L0s <4us, L1 unlimited
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive-
BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR+,
OBFF Not Supported
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
OBFF Disabled
AtomicOpsCtl: ReqEn-
LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB,
EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-,
LinkEqualizationRequest-
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci
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