[alsa-devel] ALSA: usb: Work around CM6631 sample

Clemens Ladisch clemens at ladisch.de
Wed Mar 6 09:43:00 CET 2013

Demian Martin wrote:
> CMedia ... told me that the chips are different

The CM6610/20 chips did not get an updated -A version, so it's possible
that the changes are just for the I²S I/Os, which should not affect the
USB interface.  Maybe the newer chip just gave them an opportunity to
update the firmware.

> there is a sequence problem between setting sample rate and sending
> the "play' command.

This sound like the interface setting problem fixed by this patch.

> Something about UAC1 method not being the same as UAC2.

But this might indicate that we need to kick the Clock Source Entity.


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