On Tue, Jun 12, 2012 at 7:01 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > If you enable CONFIG_USB_DEBUG, you can go into the appropriate > subdirectory of /sys/kernel/debug/usb/ehci and see what the various > files there contain. > Good to know, thanks! I'm now reading up on what the data from the async file means. $ cat /sys/kernel/debug/usb/ehci/0000\:00\:1a.7/async qh/ffff88047452a700 dev8 hs ep2 42002208 40000000 (80008c00 data1 nak4) ffff880037801180 out len=0 80008c00 urb ffff880596b06600 $ cat /sys/kernel/debug/usb/ehci/0000\:00\:1a.7/lpm $ cat /sys/kernel/debug/usb/ehci/0000\:00\:1a.7/periodic size = 1024 $ cat /sys/kernel/debug/usb/ehci/0000\:00\:1a.7/registers bus pci, device 0000:00:1a.7 EHCI Host Controller EHCI 1.00, hcd state 1 ownership 00000001 SMI sts/enable 0xc0080000 structural params 0x00103206 capability params 0x00016871 status 8008 Async FLR command 0010021 (park)=0 ithresh=1 Async period=1024 RUN intrenable 37 IAA FATAL PCD ERR INT uframe 3f17 port:1 status 001000 0 ACK POWER sig=se0 port:2 status 001000 0 ACK POWER sig=se0 port:3 status 003000 0 ACK POWER OWNER sig=se0 port:4 status 001005 0 ACK POWER sig=se0 PE CONNECT port:5 status 001000 0 ACK POWER sig=se0 port:6 status 001000 0 ACK POWER sig=se0 irq normal 43424 err 0 reclaim 6314 (lost 21) complete 43440 unlink 3819 > Does the same thing happen if you run the program on a different > computer? I just ran the code on a laptop as well as my desktop, and got the same result. For the OUT txn, I see an OUT packet, DATA1 packet, and then an ACK packet. I don't have CONFIG_USB_DEBUG built into the laptop's kernel, so I couldn't see anything more than usbmon. Which reported the same problem as before. Assuming that I have found the correct USB pci device, the desktop has a 00:1a.7 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2 and the laptop has a 00:1a.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #2 (rev 04) Austin Schuh -- 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
