On Fri, Jan 25, 2013 at 03:52:43PM +0100, humanshu bhatia wrote: > Hello, Hi, > I am new to linux device driver I am performing usb test on Netchip PLX > 3380 card by using testusb. 3380 is currently out of tree. > All test are running fine so far with sudo ./testusb -D > /proc/bus/usb/001/010 -a. > > But when I tried with loopback configuration in g_zero it is not running > fine and giving below output: > *Case 1* > use_dma´=0 also in sudo modprobe usb3380 use_dma=0 and Sudo insmod > g_zero.ko loopdefault=1 in this case after write request ..read request hang > > sudo ./testusb -D /proc/bus/usb/001/010 -t 1 -c1 -s1024 ( *Write *test > with loopback enabled ) > > *Output*: unknown speed /proc/bus/usb/001/010 > unknown speed /proc/bus/usb/001/010 test 1, 0.000181 secs > > sudo ./testusb -D /proc/bus/usb/001/010 -t 2 -c1 -s1024 ( *Read *test with > loopback enabled ) > > *Output*: Hang > . > > > *Case 2* > sudo modprobe usb3380 and Sudo insmod g_zero.ko loopdefault=1 > > And after that when I try run below test it give me this error > > sudo ./testusb -D /proc/bus/usb/001/010 -t 1 -c1 -s1024 ( *Write *test > with loopback enabled ) > > *Output*: unknown speed /proc/bus/usb/001/010 > unknown speed /proc/bus/usb/001/010 test 1, 0.000181 secs This is not an error message. "unknown speed" because it does not know that it runs at super speed I guess. Test 1 completed. That looks okay. > > sudo ./testusb -D /proc/bus/usb/001/010 -t 2 -c1 -s1024 ( *Read *test with > loopback enabled ) > > *Output*: [16188.451455] usb 1-4 : test2 failed, iterations left 0 , status > -121 (not 0) > /proc/bus/usb/001/010 test 2 --> 121 (Remote I/O error) > > But sometimes read test in loopback enabled runs fine but I want > consistentency in test why sometimes read fails and give above output. > In case of success of read it gives below output > > *Output*: unknown speed /proc/bus/usb/001/010 > unknown speed /proc/bus/usb/001/010 test 1, 0.000181 secs I *think* hat the parameter loopdefault=1 should make no difference for the tests but I might be wrong. Could you try to run your test against dummy_hcd ? It is an UDC emulator. If that one works "perfectly" and your 3380 still make problems then I would say the driver for the 3380 has room for improvement _or_ is buggy :) It is very hard to give any kind of advice except to take a look at your 3380 driver. If it works sometimes and sometimes it does not then it looks like a race condition in the driver. Maybe "dmesg" on the gadget side (where 3380 is loaded) might print an error message. > Please tell me where I am doing wrong. > I shall be highly thankful to you. > > Thanks & Regards, > Humanshu Sebastian -- 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
