On Fri, Mar 27, 2015 at 09:47:06AM -0400, Alan Stern wrote: > On Fri, 27 Mar 2015, Peter Chen wrote: > > > Hi Alan, > > > > I tried to your case today, but it seems full speed hub with siTD > > has some problems with latest greg's next tree, I use UAC2 with > > configfs for audio device, high speed hub works ok. > > > > The commands: > > aplay -D hw:1,0 audio32k16M.wav > > arecord -Dhw:1 -r 32000 -c 1 -f S16_LE -d 20 file_32.wav > > > > The corresponding failure logs: > > [ 81.542848] ci_hdrc ci_hdrc.0: iso sched full bd7d5100 > > [ 81.542884] usb 1-1.2: cannot submit urb 0, error -28: not enough > > bandwidth > > [ 355.078938] ci_hdrc ci_hdrc.0: iso sched full bd49cc00 > > [ 355.078969] usb 1-1.2: cannot submit urb 0, error -28: not enough > > bandwidth > > That's strange. Can you please post the /sys/kernel/debug/usb/devices > file (with the UAC2 gadget plugged in), and also collect a usbmon trace > of the test? > It should be UAC2 gadget or chipidea driver problem, it is ok if I plug in USB audio card, but most of current audio cards support 44.1k+ frame rate, it can't handle the 3rd endpoint (176-184 bytes / endpoint), I don't know how to let it only read/writes 64 bytes, anyway, I will fix the UAC2 gadget problem first. Device file for UAC2: T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 14 Spd=12 MxCh= 0 D: Ver= 0.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=15a2 ProdID=0054 Rev= 4.00 S: Manufacturer=Freescale S: Product=FSL i.mx6q sabreSD Board S: SerialNumber=123456ABCDEF C:* #Ifs= 3 Cfg#= 1 Atr=80 MxPwr= 6mA A: FirstIf#= 0 IfCount= 3 Cls=01(audio) Sub=00 Prot=20 I:* If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=20 Driver=snd-usb-audio I:* If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=20 Driver=snd-usb-audio I: If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=20 Driver=snd-usb-audio E: Ad=01(O) Atr=05(Isoc) MxPS=1023 Ivl=1ms I:* If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=20 Driver=snd-usb-audio I: If#= 2 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=20 Driver=snd-usb-audio E: Ad=81(I) Atr=05(Isoc) MxPS=1023 Ivl=1ms usbmon trace: I did not trace it since I did not find any data traffic on the bus through USB Bus Analyzer. -- Best Regards, Peter Chen -- 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
