On Tuesday, June 30, 2015 at 04:23:01 AM, Peter Chen wrote: > On Fri, Jun 26, 2015 at 07:15:18PM +0200, Sébastien Pruvost wrote: > > Hello, > > > > I'm sending this mail to report a bug concerning the latest kernel 4.1. > > > > Here is the problem (and the test I've done): > > I have firstly used the 3.10.53 kernel for my two > > sabrelites in > > > > order to use the audio gadget driver with the Dual Role ChipIdea > > Controller (in order to switch roles between my two IMX6 sabreLite). > > After loading g_audio in my two sabreLite and plugging the cable (microA > > – microB), there is an error “ci_hdrc.0 request length too big for > > isochronous snd_uac2.0 1116 Error”. > > And even after running aplay command, I still got this error and there is > > no sound getting out of the jack port. > > I've switched roles between the two boards by following this: https:// > > www.kernel.org/doc/Documentation/usb/chipidea.txt. > > This works fine with the serial driver, I can see a new serial interface > > (host side) and after switching role a new serial interfaces at device > > side. Same thing for ethernet gadget: this works fine too. But not with > > the audio gadget. In fact, there is a new audio interface at host side > > but I can not interact with it (even alsamixer doesn’t see any controls > > on this new sound card). I’ve tested that audio gadget works fine if I > > don’t use ChipIdea HighSpeed Dual Role Controller. > > > > Secondly I have tested this audio gadget with the latest > > Kernel > > > > 4.1 for my two IMX6 sabrelites (imx_v6_v7_defconfig). Now these previous > > errors are gone but there are still no sound getting out of the jack > > port (even if there are a new sound card in host side) > > It is may not a role switch problem, please check if the g_audio can > work well with an ubuntu PC (make sure your codec works well). ci_hdrc.0 request length too big for isochronous Doesn't this just mean it cannot transfer such a long buffer via ISO pipe ? I guess the UAC should send smaller buffers to work with the CI HDRC? Best regards, Marek Vasut -- 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
