On Tue, Sep 27, 2016 at 10:53:54PM +0800, yfw wrote: > Hi, > > On 2016/9/27 22:28, Bin Liu wrote: > >On Tue, Sep 27, 2016 at 09:20:56AM -0500, Bin Liu wrote: > >>Felipe, > >> > >>On Tue, Sep 27, 2016 at 10:18:26AM +0300, Felipe Balbi wrote: > >> > >>[snip] > >> > >>>>>>Does this mean the issue of isoc high bandwidth transfer was fixed by > >>>>>>this patchset per your test? > >>>>> > >>>>>No, I couldn't get g_webcam to work yet. > >>>> > >>>>In mainline, g_webcam is broken with DWC3. Also these two patches don't > >>>>fix the issue on v4.4.21. > >>> > >>>care to send tracepoint output? Best if you could cherry pick my latest > >>>tracepoint changes so we have the best output possible. > >>> > >>>I have also built a branch with v4.4.21 + all dwc3 patches (except for > >>>device properties and PCI stuff) which you could use for testing. If you > >>>run with that, then I can get proper trace output and I can try to > >>>figure out what's missing. > >>> > >>>Branch is here: > >>> > >>> git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git usb/v4.4.21+dwc3 > >> > >>This branch does not generate the isoch traffic (on ep2in). ftrace > >>attached (dwc3-g_webcam-v4.4.21+tp.ftrace). > >> > >>I also attached the ftrace log for v4.4.21 tag > >>(dwc3-g_webcam-v4.4.21.ftrace) for comparison, which has ep2in isoch > >>traffic, but only one transaction per SOF. > > > >Sorry, I didn't realize the ftrace file size is huge. Attached the > >tarball here. > >(dwc3-g_webcam-ftrace.tgz) > > > >Regards, > >-Bin. > > > From the ftrace log: > > > irq/441-dwc3-769 [001] d..2 101.207679: dwc3_gadget: ep2in-isoc: req > > ed971b00 dma ad9d2000 length 5120 > 5120 looks wrong to me. 5120 == 0x1400. There is an issue in uvc_video which > set the req_size according maxpacket (which is 0x1400 for high bandwidth isoc). > > > irq/441-dwc3-769 [001] d..2 101.207682: dwc3_prepare_trb: ep2in-isoc: > > trb f2037020 bph 00000000 bpl ad9d2000 size 00001400 ctrl 00000c69 > > Looks like the "bits 12:11 of wMaxPacketSize" patch from Felipe was not applied. No, I didn't. I was trying to give a trace for the base line to start with. Regards, -Bin. > > > irq/441-dwc3-769 [001] d..2 101.208357: dwc3_complete_trb: ep2in-isoc: > > trb f2037020 bph 00000000 bpl ad9d2000 size 10001400 ctrl 1bfd0c68 > > MissedIsoc happened. > > > Regards > Yin, Fengwei > -- 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
