Re: 2.6.23.11 : ehci not working with a710 camera

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Wed, 19 Dec 2007, David Brownell wrote:

> Here's that patch.  Please give it at try with USB_DEBUG enabled.
> Note that the patch has two behavioral changes -- avoid the "what
> maxpacket should I use?" dance that's not needed, and use a longer
> delay at one point -- plus a diagnostic change to make EHCI report
> what control transfers are making trouble.
> 
> We should at least be able to find out just what calls are making
> the trouble (and at what point in the sequence), even if the behavior
> changes don't help.  :)

I agree it's worth trying this.  For the future, however, I would be
cautious about removing that "determine maxpacket" code for low- and
high-speed devices.  Windows uses it always, regardless of the device
speed, and quite likely some devices won't work without it.

Alan Stern


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