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

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Message-ID: <20140225181234.GF23275@saruman.home>
Date:	Tue, 25 Feb 2014 12:12:34 -0600
From:	Felipe Balbi <balbi@...com>
To:	Peter Chen <Peter.Chen@...escale.com>
CC:	Neil Zhang <zhangwm@...vell.com>, "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>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [PATCH 2/6] usb: gadget: mv_udc: disable HW zlt for ep0

Hi,

On Tue, Feb 25, 2014 at 07:46:08AM +0000, Peter Chen 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?

wait, this is a chipidea core ? Why aren't you guys using the chipidea
driver yet ? You need to switch over to that driver dude, we can't have
duplicated code in the tree.

I'm sorry, but I won't be taking this series, please use chipidea
driver, it should be very simple to add a glue layer for your core to
the chipidea driver.

-- 
balbi

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