On Tue, Apr 2, 2013 at 4:36 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 2 Apr 2013, Yegor Yefremov wrote: > >> On Tue, Apr 2, 2013 at 4:14 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >> > On Tue, 2 Apr 2013, Yegor Yefremov wrote: >> > >> >> I'm making a burn-in test (see serialtest.py >> >> http://pastebin.com/pz47gaar) for our devices, that have built-in FTDI >> >> chips. If FT2232C is attached directly to the USB host controller >> >> port, the tests run properly. If I connect the chip to a USB-hub some >> >> of the tests show timeout errors (read() routine). On the newer host >> >> with USB3.0 this issue occurs on all USB ports where I attach FT2232C. >> >> I tried kernels 3.2, 3.5 and 3.8. >> >> >> >> The test procedure opens two ports, exchanges data and closes ports. >> >> If I don't open/close ports I don't encounter this issue. >> >> >> >> The FT4232H has no problems whether I attach it to USB HC or via HUB. >> >> Any idea how to workaround the problem? >> > >> > If you use a different type of hub, does the test work? >> >> So far I tested with 3 different hub chips SMSC, GL (USB2.0) and one >> USB3.0 hub - no difference. > > In that case, try collecting two usbmon traces showing what happens > during the test. In one trace, connect the FT2232C directly to the > computer port; in the other, go through the GL hub. See > Documentation/usb/usbmon.txt for instructions. Will do. > By the way, do the errors still occur if you attach the hub to a USB-2 > port? I made a list of configurations (lsusb and related lsusb -t outputs) where the test works and doesn't work. What I've noticed is, that only if FTDI chips is internally routed to 12M connection, the test work, if the HCD channel is marked as 480M (HUB and USB 3.0 case) test fails. Working set (direct connection to USB 2.0. HCD) Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 002: ID 0403:6010 Future Technology Devices International, Ltd FT2232C Dual USB-UART/FIFO IC user@user-desktop:~$ lsusb -t /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M |__ Port 1: Dev 2, If 0, Class=vend., Driver=ftdi_sio, 12M |__ Port 1: Dev 2, If 1, Class=vend., Driver=ftdi_sio, 12M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/6p, 480M Not working set (the same USB 2.0 HCD, but via Genesys Logic USB 2.0 HUB) Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB Bus 001 Device 004: ID 0403:6010 Future Technology Devices International, Ltd FT2232C Dual USB-UART/FIFO IC /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/6p, 480M |__ Port 5: Dev 3, If 0, Class=hub, Driver=hub/4p, 480M |__ Port 4: Dev 4, If 0, Class=vend., Driver=ftdi_sio, 12M |__ Port 4: Dev 4, If 1, Class=vend., Driver=ftdi_sio, 12M USB 3.0 host (not working) Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 003 Device 002: ID 108b:0005 Grand-tek Technology Co., Ltd Bus 003 Device 009: ID 0403:6010 Future Technology Devices International, Ltd FT2232C Dual USB-UART/FIFO IC Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M |__ Port 1: Dev 2, If 0, Class=HID, Driver=usbhid, 1.5M |__ Port 1: Dev 2, If 1, Class=HID, Driver=usbhid, 1.5M |__ Port 4: Dev 9, If 0, Class=vend., Driver=ftdi_sio, 12M |__ Port 4: Dev 9, If 1, Class=vend., Driver=ftdi_sio, 12M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/8p, 480M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M Yegor -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
