Re: Problem setting mixer switch with amixer/alsactl.

[Oliver Ford <ipaqlinux@oliford.co.uk>]

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Oliver Ford wrote:

>>         name 'Speaker Playback Volume'
>>         value 1
>>     }
>>         
This is unrelated, I have just left it there from playing around.


>
>> One other thing that would be useful would be to put trace which logs
>> the register writes in ac97_write() in the driver and then try testing
>> both using alsamixer and then amixer to do the final enable of the
>> Speaker Mixer PCM Playback Switch.
>>       
Well...

In terms of the control's direct effect, setting it in alsamixer gives:
pxa2xx_ac97_write: 0c = af08

setting it in amixer:
pxa2xx_ac97_write: 0c = af09



Am I right in understanding that setting all the controls in amixer 
doesn't actually enable the control in the codec chip at that time but 
that the powering on/off is done by soc-dapm.c when the the DAC is 
actually enabled when playing some audio? This appears to be what is 
happening when it does work (looking at the log). I hadn't realised this.

However, after running the offending amixer command this no longer 
happens. It seems that the dapm_power_widgets() function determines that 
the DAC is off and so doesn't power any widgets on at all.

I've put some debugging in pxa2xx-ac97-write and in dapm_power_widgets() 
and the log is attached (stripped of non-audio stuff).



Oliver

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Clean boot...


** run speaker.sh setup without PCM->speaker setting... **
pxa2xx_ac97_write: 000c = ef08
pxa2xx_ac97_write: 001c = 0002
pxa2xx_ac97_write: 001c = 1802
pxa2xx_ac97_write: 001e = 0800
pxa2xx_ac97_write: 0006 = 0081
pxa2xx_ac97_write: 0002 = 0080

** run alsamixer, set PCM->speaker on: ** 
pxa2xx_ac97_write: 000c = af08


# aplay /stuff/400Hz-wav.wav
+hpipaq214_startup()
hpipaq214-audio: Enabling iPAQ Speaker...
hpipaq214_startup, gpio96 -> on
-hpipaq214_startup()

Playing WAVE '/stuff/400Hz-wav.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono
pxa2xx_ac97_write: 002a = 0411
pxa2xx_ac97_write: 002c = ac44
DAPM: Path Widget 'DAC Inv Mux 2': off --> on
DAPM: Path Widget 'Out 4 Mux': off --> on
DAPM: Path Widget 'Left Speaker Out Mux': off --> on
DAPM: DAC Widget 'Right DAC': off --> on (w->active==1)
pxa2xx_ac97_write: 003c = 3abf
DAPM: DAC Widget 'Left DAC': off --> on (w->active==1)
pxa2xx_ac97_write: 003c = 3a3f
DAPM: Path Widget 'AC97 Mixer': off --> on
DAPM: Path Widget 'Speaker Mixer': off --> on
pxa2xx_ac97_write: 003c = 3a3d
DAPM: Path Widget 'Out 4': off --> on
pxa2xx_ac97_write: 003e = efff
DAPM: Path Widget 'Left Speaker': off --> on
pxa2xx_ac97_write: 003e = eeff
freq changed, set PCD to 5 (LCCR3 = 04700005, LCCR4 = 80000000)
DAPM: Path Widget 'iPAQ Speaker': off --> on
pxa2xx_ac97_write: 003c = 1a3d
hpipaq214_shutdown, gpio96 -> off

** aplay exits. **

** ... few seconds delay ... **

DAPM: Path Widget 'iPAQ Speaker': on --> off
DAPM: Path Widget 'Out 4': on --> off
pxa2xx_ac97_write: 003e = feff
DAPM: Path Widget 'Left Speaker': on --> off
pxa2xx_ac97_write: 003e = ffff
DAPM: Path Widget 'AC97 Mixer': on --> off
DAPM: Path Widget 'Speaker Mixer': on --> off
pxa2xx_ac97_write: 003c = 1a3f
DAPM: Path Widget 'Right DAC': on --> off
pxa2xx_ac97_write: 003c = 1a7f
DAPM: Path Widget 'Left DAC': on --> off
pxa2xx_ac97_write: 003c = 1aff
DAPM: Path Widget 'DAC Inv Mux 2': on --> off
DAPM: Path Widget 'Out 4 Mux': on --> off
DAPM: Path Widget 'Left Speaker Out Mux': on --> off
pxa2xx_ac97_write: 003c = 1aff
pxa2xx_ac97_write: 0026 = 0000


** all quiet **

#
#
# amixer cset numid=62 1 
pxa2xx_ac97_write: 000c = af09
numid=62,iface=MIXER,name='Speaker Mixer PCM Playback Swit'
  ; type=BOOLEAN,access=rw---,values=1
  : values=on



# aplay /stuff/400Hz-wav.wav
+hpipaq214_startup()
hpipaq214-audio: Enabling iPAQ Speaker...
hpipaq214_startup, gpio96 -> on
-hpipaq214_startup()

Playing WAVE '/stuff/400Hz-wav.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono
freq changed, set PCD to 5 (LCCR3 = 04700005, LCCR4 = 80000000)
pxa2xx_ac97_write: 002a = 0411
pxa2xx_ac97_write: 002c = ac44
DAPM: DAC Widget 'Right DAC': off --> off (w->active==1)
DAPM: DAC Widget 'Left DAC': off --> off (w->active==1)
pxa2xx_ac97_write: 003c = 1aff
hpipaq214_shutdown, gpio96 -> off
# 
#
pxa2xx_ac97_write: 003c = 1aff
pxa2xx_ac97_write: 0026 = 0000

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