linux-kernel - RE: [linux-usb-devel] [PATCH] : Allow embedded developers USB options normally reserved for OTG

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Date:	Thu, 3 Jan 2008 22:34:06 +0530
From:	"Richard D" <richard@...unus.com>
To:	"'Bryan Wu'" <cooloney.lkml@...il.com>,
	"'David Brownell'" <david-b@...bell.net>
Cc:	"'Robin Getz'" <rgetz@...ckfin.uclinux.org>,
	<linux-usb-devel@...ts.sourceforge.net>, <gregkh@...e.de>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [linux-usb-devel] [PATCH] : Allow embedded developers USB options normally reserved for OTG

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.


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