linux-kernel - Re: [PATCH 1/3] driver for mcs7830 (aka DeLOCK) USB ethernet adapter

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Date:	Thu, 28 Sep 2006 13:07:21 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-usb-devel@...ts.sourceforge.net,
	David Hollis <dhollis@...ehollis.com>, support@...chip.com,
	dbrownell@...rs.sourceforge.net, linux-kernel@...r.kernel.org,
	Michael Helmling <supermihi@....de>
Subject: Re: [PATCH 1/3] driver for mcs7830 (aka DeLOCK) USB ethernet adapter

On Thursday 28 September 2006 03:28, David Brownell wrote:
> ... yes, I'd assume it's a hardware issue too.  Try different
> cables; if you have a fast 'scope, you might see what kind of
> eye diagram you get.

Unfortunately, I don't have anything I could use to test this.

> Do you know how the remote wakeup mechanism works for this chip?
> It'd be interesting to see "usbnet" be taught how to autosuspend
> chips which will wake up the USB host when they get the right
> kind of packet ... for example, passing the multicast/broadcast
> filter, or addressed directly to that adapter.
> 
> Such an autosuspend mechanism would let the host controller stop
> polling a mostly-idle network link, getting rid of one source of
> periodic DMA transfers and thus allowing deeper sleep states for
> many x86 family CPUs.  And also, I'd expect, giving fewer
> opportunities for those broken RX packets.  :)

No, don't know. I did not find anything about this in the public
spec.

	Arnd <><
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