Microphone gain on N900

[Pali Rohár]

On Sunday 26 February 2017 21:28:32 Pavel Machek wrote:
> Hi!
> 
> v4.10 works quite nicely on N900, but I still have problems with
> audio. Even GSM calls would be usable, if I had reasonable volume on
> microphone and speaker... but I don't.
> 
> Both speaker and microphone are too quiet. I can get louder output by
> plugging headset -- good. I can hear the other side nicely, but am
> too quiet for them. Unfortunately, even if I plug in wired headset,
> internal microphone is still used.
> 
> Now... I researched mixer settings in v4.4, v4.10 and v2.6.28... and
> could not find way to control microphone. v2.6.28 is completely
> different from the other two. v4.10 misses many controls from v4.4;
> and I guess this might be related:
> 
> [    2.579925] rx51-audio n900-audio: tlv320aic3x-hifi <->
> 49022000.mcbsp mapping ok
> [    2.586486] rx51-audio n900-audio: ASoC: no source widget found
> for TPA6130A2 HPLEFT
> [    2.592651] rx51-audio n900-audio: ASoC: Failed to add route
> TPA6130A2 HPLEFT -> direct -> Headphone Jack
> [    2.605163] rx51-audio n900-audio: ASoC: no source widget found
> for TPA6130A2 HPRIGHT
> [    2.611938] rx51-audio n900-audio: ASoC: Failed to add route
> TPA6130A2 HPRIGHT -> direct -> Headphone Jack
> [    2.625701] rx51-audio n900-audio: ASoC: no sink widget found for
> TPA6130A2 LEFTIN
> [    2.632965] rx51-audio n900-audio: ASoC: Failed to add route LLOUT
> -> direct -> TPA6130A2 LEFTIN
> [    2.640563] rx51-audio n900-audio: ASoC: no sink widget found for
> TPA6130A2 RIGHTIN
> [    2.648101] rx51-audio n900-audio: ASoC: Failed to add route RLOUT
> -> direct -> TPA6130A2 RIGHTIN
> [    2.655761] rx51-audio n900-audio: ASoC: no sink widget found for
> b LINE2R
> [    2.663208] rx51-audio n900-audio: ASoC: Failed to add route
> MONO_LOUT -> direct -> b LINE2R
> [    2.670501] rx51-audio n900-audio: ASoC: no source widget found
> for b HPLOUT
> [    2.677642] rx51-audio n900-audio: ASoC: Failed to add route b
> HPLOUT -> direct -> Earphone
> [    2.685058] rx51-audio n900-audio: ASoC: no source widget found
> for b Mic Bias
> [    2.692352] rx51-audio n900-audio: ASoC: Failed to add route b Mic
> Bias -> direct -> HS Mic
> [    2.706298] input: RX-51 AV Jack as
> /devices/platform/n900-audio/sound/card0/input6

Jarkko, Peter: can you look at above errors? Looks like audio routing is 
not correctly configured.

> Pali, do you have maemo running on top of recent kernel (v4.1, v4.4,
> v4.10?). Do voice calls work there?

Now I do not have prepared Maemo + mainline kernel for testing...

I remember that Maemo sscd/csd/... daemons were able to connect to 
cellular network but I was not trying to make voice calls.

> Any ideas welcome...
> 
> Best regards,
> 									Pavel

-- 
Pali Rohár
pali.rohar at gmail.com
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