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Message-ID: <bce87beb86d34377ac3dae0645622edf@BN1PR03MB235.namprd03.prod.outlook.com> Date: Tue, 25 Feb 2014 07:46:08 +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? > > > A unexpected zero packet cause enumeration fail. > It's not easy that the descriptor is actually 1024 bytes, so not easy to > be found. > Chipidea bug too? Does it follow ch 8.5.3.2 Variable-length Data Stage, USB 2.0 spec? Peter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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