Hi Peter, On Tue, Sep 22, 2015 at 8:03 AM, Peter Chen <peter.chen@xxxxxxxxxxxxx> wrote: > On Tue, Sep 22, 2015 at 09:07:23AM +0100, Felipe Tonello wrote: >> On Tue, Sep 22, 2015 at 12:41 AM, Peter Chen <peter.chen@xxxxxxxxxxxxx> wrote: >> > On Mon, Sep 21, 2015 at 03:25:28PM +0100, Felipe Tonello wrote: >> >> Hi all, >> >> >> >> I actually found the problem but can't really understand. The ci_irq() >> >> handler (from core.c) is not been called after a ep_queue() from >> >> f_midi_transmit(). >> >> >> >> Is there any reason for that? >> >> >> >> I used mass_storage gadget, made file transfers and others, and the >> >> interrupt handler was been called as expected. >> >> >> > >> > Which Soc are you using? And which kernel version are you using? >> >> i.MX6Q (industrial temp) and v4.2. We are using the imx6 REX module[1]. >> >> We checked the errata and didn't seem to have anything relevant. >> >> I wonder: was f_midi ever working properly, ie, complete callback ever called? >> > > Would you give your cpu revision number, and show me > how to reproduce it? I can test at my board. MCIMX6QAVT10AC To reproduce: * add this line to the f_midi_complete() function under the "case 0": VDBG(cdev, "%s normal completion (%d), %d/%d\n", ep->name, status, req->actual, req->length); * build a kernel with verbose debug enabled on USB gadget subsystem * load g_ether module (this will create an ALSA card and device) * connect device to host via usb otg cable. * to list the ALSA device, run `amidi -l', use the device listed as "f_midi" * send midi message using `amidi -p hw:1,0 -S 901010', my device is hw:1,0, check the output of amidi -l. * run `dmesg' you should see the message above, but if doesn't then probably the complete callback wasn't called as well. OBS: We have set the OTG_ID pin to type B (device), so no need to OTG cable on our side. Thanks, Felipe -- 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
