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

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Date:	Wed, 2 Jan 2008 23:36:09 -0800
From:	David Brownell <david-b@...bell.net>
To:	"Bryan Wu" <cooloney.lkml@...il.com>
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

On Wednesday 02 January 2008, Bryan Wu wrote:
> B.T.W, 2 questions about the MUSB driver:
> 1. What's the plan for mainline merge of the whole MUSB driver? maybe
> I can cleanup current Blackfin ports to you guys.

It might as well merge in 2.6.25-early.  It'll be easier to integrate
patches that way.  Including your Blackfin port.  When I asked before,
nobody hugely objected to "one big patch".


> 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.
 
That sounds much better than your original patch, which disabled it
always.  It might even be worth allocating a flag somewhere in the
usb_device structure to record when ep0 pings seem to misbehave.

- Dave


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