Re: [PATCH] snd-via82xx: Support all sample rate conversion capabilities of DXS channels

[Takashi Iwai <tiwai@suse.de>]

At Mon, 11 Apr 2005 18:40:09 +0400,
Sergey Vlasov wrote:
> 
> [1  <text/plain; us-ascii (quoted-printable)>]
> On Mon, Apr 11, 2005 at 04:06:06PM +0200, Takashi Iwai wrote:
> > At Sun, 10 Apr 2005 19:53:20 +0400,
> > Sergey Vlasov wrote:
> > > Add support for full sample rate conversion capabilities of DXS
> > > channels present in VIA VT8233/5/7 controllers:
> > > 
> > > - any sample rate in the 8000 ... 48000 Hz range is supported even if
> > >   the AC'97 codec supports only 48000 Hz output;
> > > 
> > > - different DXS channels can use different sample rates at the same
> > >   time (the controller performs required sample rate conversion and
> > >   mixing in hardware).
> > 
> > Thanks.  I applied it to CVS.
> > 
> > If I understand correctly, this feature should be available on all
> > machines with dxs_support=4, but you added a new dxs_support entry
> > just to be sure not to break, right?
> 
> Yes, it should work, but this driver was broken too many times in the
> past (and some Linux distributions still select via82cxxx_audio instead of
> snd-via82xx by default because of this).  On the other hand, this means
> that many existing entries with VIA_DXS_NO_VRA will just stay that way,
> because the driver will not give any messages to try dxs_support=5.
> 
> In fact, I wonder how dxs_support=1 could work at all, if the controller
> resamples everything to 48000, but the codec is configured to use some
> other rate.  Some hardware must be broken to make this work :)

Yes, it's a really wonder :)
Sometimes we had to use dx_support=1 indeed...


Takashi


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