Re: Audio driver on 2.6.26 over an HUB

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Hi

Many thanks for your attention.

- The controller is HS only, so FS device like  http://www.trust.com/products/product.aspx?artnr=14134 i'm using is not recognized at all without hub,
- When i start submit urb for recording, no other kind of urb is/'ll be started before got error. Moreover the playback bandwidth is 4 times higher than record one, since there exist 4 stero output ch. Follow the layout of isoc urb:
o Playback urb: 1 packet, 704 bytes each (44 sample, 4ch, 16bit, stereo)
o Record urb: 1 packet, 200 bytes each (100 sample, 1ch, 16bit, stereo)
Is possible to saturate bus with Record and not for Playback direction?

Thanks in advance for time spent in this issue.

Have a good day.

P.S: The kernel i'm using is 2.6.26, the board an 'embedded' fon 2.0. Using instead my PC, kernel 2.6.15, which have any type of controller {E,U,H]CI, HUB and then audio device neither  playback/record is possible. Removing ehci_hcd the pb disappear and all start to work. It seem that is a sw issue (not saying that device is well implemented ...)


--- Mar 21/4/09, Greg KH <greg@xxxxxxxxx> ha scritto:

> Da: Greg KH <greg@xxxxxxxxx>
> Oggetto: Re: Audio driver on 2.6.26 over an HUB
> A: "Salvatore Lionetti" <salvatorelionetti@xxxxxxxx>
> Cc: linux-usb@xxxxxxxxxxxxxxx
> Data: Martedì 21 Aprile 2009, 20:20
> On Tue, Apr 21, 2009 at 10:06:30AM
> +0000, Salvatore Lionetti wrote:
> > 
> > Hi
> > 
> > I'm using an hub to use FS device over an HS only
> controller, NEC D720102GC.
> 
> Ick, do you have to?  That's the toughest thing to do
> with USB :(
> 
> > - The device has 2 isoc EP, 1 ctrl, 1 intr
> > - Playback works great!
> > - Recording return 28 (ENOSPC) every time dd submit an
> urb.
> > 
> > Can someone give me some hint regard such issue?
> 
> Your bandwidth is full.  Try plugging the device
> directly into the USB
> connection on your machine, that should work better.
> 
> thanks,
> 
> greg k-h
> 


      
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