linux-kernel - RE: [PATCH 2/6] usb: gadget: mv

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Date:	Tue, 25 Feb 2014 05:15:19 +0000
From:	Peter Chen <Peter.Chen@...escale.com>
To:	Neil Zhang <zhangwm@...vell.com>
CC:	"balbi@...com" <balbi@...com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
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?

Peter
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