Re: cs46xx experimental DSP drivers

[Weijia Yang <gte733z@prism.gatech.edu>]

Benny Sjostrand wrote:>> Benny--
> 
> 
> Finally, so far I know the Santa Cruz is yet another card where we dont 
> have  technical specifications. It's possible that there is any GPIO or 
> whatever kind of logic that controls "something" that makes the sound 
> better.
> Not having a Santa Cruz card dont make things easier ... I had one I 
> would start testing all the EGPIO's by the hard way seing what happens, 
> (maybe
> someone that have time and such a card can do this ?) In the current 
> cs46xx driver there is some debug code to control the EGPIO's from the
> ALSA mixer that can be activated by defining 
> CONFIG_SND_CS46XX_DEBUG_GPIO in cs46xx_lib.c, that I've been using to 
> test EGPIO functionality on
> the Game Theater XP card.
> 
> It's possible that the current ALSA driver needs to be optimized. When a 
> new PCM channel is opened first time the driver needs to do a lot a 
> things. Sure that the you got a small and short  peak when audio 
> playback starts. Can you can meusure if it's System time, User time ?
> 
> The "external_amp" parameter is specified when module is loaded, eg. on 
> a line in /etc/module.conf:
> option snd-cs46xx external_amp=1
> 



/Benny

I have tested the modules option (the parameter is actually 
snd_external_amp) but no difference. I am attempting to use the debug 
code, but after defining I get the following errors during compile:

gcc -D__KERNEL__ -DMODULE=1 
-I/home/weijia/Downloads/alsa-cvs/alsa-driver/include 
-I/lib/modules/2.4.19/build/include -O2 -mpreferred-stack-boundary=2 
-march=i686 -malign-functions=4 -DLINUX -Wall -Wstrict-prototypes 
-fomit-frame-pointer -pipe -DALSA_BUILD -DCONFIG_SND_CS46XX_NEW_DSP=1 
-DKBUILD_BASENAME=cs46xx_lib   -c -o cs46xx_lib.o cs46xx_lib.c
In file included from cs46xx_lib.c:2:
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c: In function 
`snd_cs46xx_iec958_put':
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c:1615: warning: `res' might be 
used uninitialized in this function
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c: In function 
`snd_cs46xx_egpio_select_get':
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c:1767: structure has no member 
named `current_gpio'
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c: In function 
`snd_cs46xx_egpio_select_put':
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c:1776: structure has no member 
named `current_gpio'
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c:1777: structure has no member 
named `current_gpio'
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c: In function 
`snd_cs46xx_egpio_get':
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c:1791: structure has no member 
named `current_gpio'
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c: In function 
`snd_cs46xx_egpio_put':
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c:1806: structure has no member 
named `current_gpio'
./../alsa-kernel/pci/cs46xx/cs46xx_lib.c:1808: structure has no member 
named `current_gpio'
make[3]: *** [cs46xx_lib.o] Error 1
make[3]: Leaving directory 
`/home/weijia/Downloads/alsa-cvs/alsa-driver/pci/cs46xx'
make[2]: *** [_modsubdir_cs46xx] Error 2
make[2]: Leaving directory `/home/weijia/Downloads/alsa-cvs/alsa-driver/pci'
make[1]: *** [compile] Error 1
make[1]: Leaving directory `/home/weijia/Downloads/alsa-cvs/alsa-driver'
make: *** [build] Error 2


any ideas? Thanks

-- 
Weijia Yang
School of Electrical and Computer Engineering
Georgia Institute of Technology
Atlanta, GA



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