[alsa-devel] [PATCH] wss_lib: do not mess mixer settings during probe

Krzysztof Helt krzysztof.h1 at poczta.fm
Sun Aug 24 21:48:32 CEST 2008

On Sun, 24 Aug 2008 20:36:56 +0200
Rene Herman <rene.herman at keyaccess.nl> wrote:

> On 24-08-08 18:08, Krzysztof Helt wrote:
> > From: Krzysztof Helt <krzysztof.h1 at wp.pl>
> > 
> > Use the wss_dout function which does not mess
> > shadowed register values during chip probing.
> > Otherwise, user ends up with stupid mixer settings
> > after driver loading.
> > 
> > Signed-off-by: Krzysztof Helt <krzysztof.h1 at wp.pl>
> Acked-by: Rene Herman <rene.herman at gmail.com>
> Must say that I only now notice that we're doing that init loop there. 

I noticed it on at least three different cards.

> I 
> believe it could be better to introduce an inline __snd_wss_out() with 
> just the two outb()s and use that from snd_wss_out() and here directly.

snd_wss_dout() is almost the same. The waiting loop should never trigger
there and it is safer in case some write needs few micro-secs to finish.

> And with respect to the mb() ... if anywhere, should't that be between 
> the two outb's really?

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