linux-kernel - Re: uvcvideo causes ehci

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Date:	Sat, 24 Oct 2009 10:49:30 +0300
From:	Ozan Çağlayan <ozan@...dus.org.tr>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: uvcvideo causes ehci_hcd to halt

Alan Stern wrote:
> Okay, that proves this really is a timing bug in the hardware.  But we
> can't go around putting 2-millisecond delays in the kernel!  Maybe you
> can test to see if smaller delays will fix the problem.  If 50
> microseconds or less doesn't work then it will be necessary to add a
> new timer to ehci-hcd.
>   

Okay I'll check with smaller values there but I couldn't get the meaning
of "if 50 us or less doesn't work then it will be necessary to add a new
timer to ehci-hcd".

Thanks.

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