Re: sound/isa/cmi8330.c: dead ENABLE_SB_MIXER code

Re: sound/isa/cmi8330.c: dead ENABLE_SB_MIXER code

[Takashi Iwai]

At Mon, 4 Dec 2006 17:04:34 +0100,
Adrian Bunk wrote:
> 
> In sound/isa/cmi8330.c, the ENABLE_SB_MIXER code is currently never 
> used.
> 
> What's the story behind this?
> Should ENABLE_SB_MIXER be enabled?
> Or the code be removed?

CMI8330 has a dual interface for SB and Adlib modes.  The mixer can
also behave differently according to the mode.  The current code has
mixer elements corresponding to both modes.

However, these mixer elements _seem_ to interactive with each other,
and cannot be controlled individually.  That's why ENABLE_SB_MIXER is
disabled.  I cannot check this issue any longer since the test board
got broken long time ago...

I don't think we would get many gain by changing this old code.
(and the relevant part isn't so big.)
Let's keep as it is.


Takashi

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Re: sound/isa/cmi8330.c: dead ENABLE_SB_MIXER code

[Ondrej Zary]

On Tuesday 19 December 2006 10:59, you wrote:
> At Mon, 4 Dec 2006 17:04:34 +0100,
>
> Adrian Bunk wrote:
> > In sound/isa/cmi8330.c, the ENABLE_SB_MIXER code is currently never
> > used.
> >
> > What's the story behind this?
> > Should ENABLE_SB_MIXER be enabled?
> > Or the code be removed?
>
> CMI8330 has a dual interface for SB and Adlib modes.  The mixer can
> also behave differently according to the mode.  The current code has
> mixer elements corresponding to both modes.

CMI8330 (and also CMI8329) appears like SB16 and WSS

> However, these mixer elements _seem_ to interactive with each other,
> and cannot be controlled individually.  That's why ENABLE_SB_MIXER is
> disabled.  I cannot check this issue any longer since the test board
> got broken long time ago...

The mixer is a bit weird - and probably different between CMI8329 and CMI8330. 
At least on my CMI8329A, the master volume does not work. And there are also 
some problems with PCM volume - I can decrease it in alsamixer but not 
increase - but it works both ways in XMMS...
I have also some boards with integrated CMI8330 - so I might test it 
sometimes.

> I don't think we would get many gain by changing this old code.
> (and the relevant part isn't so big.)
> Let's keep as it is.
>
>
> Takashi
> -
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-- 
Ondrej Zary

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sound/isa/cmi8330.c: dead ENABLE_SB_MIXER code

[Adrian Bunk]

In sound/isa/cmi8330.c, the ENABLE_SB_MIXER code is currently never 
used.

What's the story behind this?
Should ENABLE_SB_MIXER be enabled?
Or the code be removed?

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed


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