[alsa-devel] HELP:How to power down TWL5030 Voice/Bluetooth sidetone PGA?

[Péter Ujfalusi]

> 2011/6/10 Péter Ujfalusi <peter.ujfalusi at ti.com>:
> 1. when use Headset:
> uplink routing:HSMIC --> AVTXR2PGA & AVTXL2PGA --> VDXS & VDXM --> PCM_VDX
> downlink routing:PCM_VDR --> VDR -->  VRXPGA Fine gain --> DAC voice
> --> VDL_GAIN Analog PGA --> HSOL/HSOR

Thanks
 
> I check the loopbacks,it seems that all Loopbacks have been disabled.
> bash-3.2# alsa_amixer |grep Loopback
> Simple mixer control 'Left Digital Loopback',0
> Simple mixer control 'Left1 Analog Loopback',0
> Simple mixer control 'Left2 Analog Loopback',0
> Simple mixer control 'Right Digital Loopback',0
> Simple mixer control 'Right1 Analog Loopback',0
> Simple mixer control 'Right2 Analog Loopback',0
> Simple mixer control 'Voice Analog Loopback',0
> Simple mixer control 'Voice Digital Loopback',0

Can you check with:
amixer | grep -A 6  Loopback


> The sidetone is become louder if I increase the VSTPGA,
> and when I increase the VDL_GAIN Analog PGA,the sidetone is become louder
> too. But the VRXPGA seems don't affect the sidetone,so I think VSTPGA
> cause the sidetone.
> 
> 2.when use Bluetooth:
> uplink routing:BT_PCM_VDR --> BTTXPGA --> VDXM --> PCM_VDX
> downlink routing:PCM_VDR --> VDR --> BTRXPGA --> BT_PCM_VDX
> 
> When use Bluetooth interface,I don't know if something else can cause
> sidetone except BTSTPGA.

I don't have a board, which have this feature, but I'll check the TRM and the 
code, if I can find something. Probably worth to find the ERRATA document as 
well...

-- 
Péter