On Tue, Aug 19, 2014 at 06:05:27PM +0800, Xuebing Wang wrote: > > On 08/19/2014 12:58 PM, Peter Chen wrote: > >>My environment is Freescale i.MX6SL EVK board (as USB peripheral device), > >>which is based on kernel 3.10.17. i.MX6SL uses ChipIdea dual-role > >>controller. > >> > >>My problem is that gadget drivers g_ether and g_audio (UAC1 enabled) can > >>NOT be detected by Windows 7 natively, while g_mass_storage, g_serial, > >>g_hid can be detected by Windows 7 natively. > >> > >>1) I found that both Ether and USB Audio uses .bAlternateSetting, while > >>Mass Storage, Serial and HID do NOT. I am wondering if this is related to > >>how Gadget framework handles USB_REQ_SET_INTERFACE request? > >> > >If possible, would you use Linux PC or Mac OS (macbook pro+) to test? > >>From my previous experiences, g_audio works not well with windows. > > Thanks Peter. g_audio is now working with Ubuntu and MacOS host, but > can NOT get detected by Windows 7. > > I am not sure if this Windows 7 detection issue is not specific to > g_audio (UAC1), because Windows can NOT natively detect g_ether > (even with RNDIS CONFIG_USB_ETH_RNDIS=y enabled). > > Also, in file f_rndis.c, it says "/* Some controllers can't support > RNDIS ... */", I am not sure what does this mean. Does it mean > possibly controller like ChipIdea does NOT support RNDIS? > RNDIS is software stuff, isn't it? > > >>2) Also, I am not sure if it is related to ChipIdea quirk > >>(gadget_supports_altsettings in file gadget_chips.h)? > >> > >I can't find chipidea quirk at gadget_chips.h, besides, altsettings > >are software stuff. > > > >Peter > > -- > Thanks, > Xuebing Wang > -- 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
