From: "Richard D" <richard@embunus.com>
To: "'Bryan Wu'" <cooloney.lkml@gmail.com>,
       "'David Brownell'" <david-b@pacbell.net>
Cc: "'Robin Getz'" <rgetz@blackfin.uclinux.org>,
       <linux-usb-devel@lists.sourceforge.net>, <gregkh@suse.de>,
       <linux-kernel@vger.kernel.org>
References: <200801020948.51310.rgetz@blackfin.uclinux.org>	 <200801021943.38716.david-b@pacbell.net>	 <386072610801022040ja4919bapa8a0712c1246c3f3@mail.gmail.com>	 <200801022336.10355.david-b@pacbell.net> <386072610801030005g7408f333m935c665c82d3412a@mail.gmail.com>
In-Reply-To: <386072610801030005g7408f333m935c665c82d3412a@mail.gmail.com>
Subject: RE: [linux-usb-devel] [PATCH] : Allow embedded developers USB options normally reserved for OTG
Date: Thu, 3 Jan 2008 22:34:06 +0530
Message-ID: <001c01c84e2a$ad3bceb0$07b36c10$@com>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
Thread-Index: AchN32NaS20vL34PSAyfvuL4SVr6MwASyK/Q
Content-Language: en-us
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 950
Lines: 25

Does all USB Host controller hardware have the ability to disable PING?

> > > 2. Do you remember the PING issue I reported in OMAP list? How do
> you
> > > think of that?
> >
> > Yes, something needs to be done.  EHCI might benefit from the same
> > kind of patch, to cope with ill-behaved usb thumb drives.
> >
> >
> > > > I have an idea: the USB_NAKLIMIT0 should be set to some value,
> when we
> > > > got NAK timeout interrupt, we can disable PING. When enumerating
> normal
> > > > USB stick, there is no NAK timeout, because PING is efficient for
> > > > handshaking. While problem USB stick will generate NAK timeout
> > > > interrupt, we disable PING for this kind of USB device
> enumeration.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/