linux-kernel - Re: 2.6.35-rc3 E-MU 0404 USB problem

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Message-ID: <AANLkTikiVMjIcnXrCVS6UK1ln1NVUZc3pjSGIIFwSJkg@mail.gmail.com>
Date:	Wed, 23 Jun 2010 18:49:48 +0100
From:	James Courtier-Dutton <james.dutton@...il.com>
To:	sboyce@...eyonder.co.uk
Cc:	LKML Mailing List <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: 2.6.35-rc3 E-MU 0404 USB problem

On 22 June 2010 13:58, Sid Boyce <sboyce@...eyonder.co.uk> wrote:
> I have an application using the on-board sound card mic which should send
> it's data to the USB card for relay to a Sofweare Defined Radio as 2
> quadrature signals digital (I/Q) for transmission.
> On the receiving side it can take data from the Radio at up to 192K sample
> rate --> program --> Speaker on the on-board sound card - that works fine.
> Transmit fails, dmesg output with 48K sample rate set is:-
> [509686.177169] ALSA sound/usb/clock.c:214: 6:2:3: endpoint lacks sample
> rate attribute bit, cannot set.
> [509686.187920] ALSA sound/usb/clock.c:214: 6:2:1: endpoint lacks sample
> rate attribute bit, cannot set.
> [509686.266905] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> [509686.330901] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> [509686.353775] ALSA sound/usb/clock.c:214: 6:2:7: endpoint lacks sample
> rate attribute bit, cannot set.
> [509686.394898] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> [509686.458886] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> [509686.522874] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> [509823.078594] ALSA sound/usb/clock.c:214: 6:2:3: endpoint lacks sample
> rate attribute bit, cannot set.
> [509823.091571] ALSA sound/usb/clock.c:214: 6:2:1: endpoint lacks sample
> rate attribute bit, cannot set.
> [509823.146811] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> [509823.202679] ALSA sound/usb/clock.c:214: 6:2:7: endpoint lacks sample
> rate attribute bit, cannot set.
> [509823.210807] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> [509823.274792] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> [509823.338782] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> [509823.402783] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
> Regards
> Sid.
> --

This device uses a global clock rate according to the data sheets.
So, record rate must equal playback rate.
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