> -----Original Message----- > From: Peter Chen [mailto:Peter.Chen@xxxxxxxxxxxxx] > Sent: 2014年2月25日 13:15 > To: Neil Zhang > Cc: balbi@xxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; > linux-kernel@xxxxxxxxxxxxxxx > Subject: RE: [PATCH 2/6] usb: gadget: mv_udc: disable HW zlt for ep0 > > > > > > > On Mon, Feb 24, 2014 at 04:03:12PM +0800, Neil Zhang wrote: > > > > Hardware zlt will try to send the zero length packet automatically > > > > when the data transferd is multiple times of max packet, this will > > > > cause issues on Windows. > > > > So let's disable HW zlt by default. > > > > > > Would you have description that what kinds of issue on Windows if > > > zlt is is selected? > > > > > > > Enumeration will fail. > > > > What causes enumeration fail, why it does not occur before? > A unexpected zero packet cause enumeration fail. It's not easy that the descriptor is actually 1024 bytes, so not easy to be found. > Peter Best Regards, Neil Zhang ?韬{.n?????%??檩??w?{.n???{炳???骅w* jg????????G??⒏ ⒎?:+v???????? ????＂??????
