[alsa-devel] HELP:How to power down TWL5030 Voice/Bluetooth sidetone PGA?
peter.ujfalusi at ti.com
Fri Jun 10 16:16:13 CEST 2011
> 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
> 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
More information about the Alsa-devel