Re: Split transaction support

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On Tue, 24 Feb 2009, Naveen@moschip wrote:

> Hi All,
> 
> Is there any support for split transactions ( ISOCH IN ) in linux kernel ?.

Yes, of course there is.

> I am using linux-2.6.27 and connected USB full speed camera (Logitech
> QuickCam Pro 3000) under a high speed hub. The camera is detected by PWC
> driver & when I tried to open the application (IP Telephony), it is not
> capturing the video. Where as If I connect the device directly to ohci
> roothub, the application is successfully capturing the video.

You should use usbmon to collect a trace for each of the two cases: 
attached directly to OHCI and attached via a high-speed hub.  
Comparison of the two should indicate where the problem lies.  
Instructions for usbmon are in Documentation/usb/usbmon.txt.

Alan Stern

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