[alsa-devel] [PATCH 1/1] ASoC: TWL4030: Wait RAMP_DELAY on headsetl_event: POST_PMD

Jarkko Nikula jhnikula at gmail.com
Thu May 14 08:08:08 CEST 2009

On Thu, 14 May 2009 08:27:11 +0300
Peter Ujfalusi <peter.ujfalusi at nokia.com> wrote:

> That is why I'm a bit nervous when I need to touch the core... It has
> been working fine for all other codes so far. 
> In the twl4030 codec case, the playback involves the following chain
> in DAPM domain:
> Headset, PreDrive, Carkit, Earpiece:
> DAC -> PGA -> Mixer -> output pin.
> Handsfree:
> DAC -> PGA -> Mux -> output pin.
> Is it possible to add several SND_SOC_DAPM_PRE to the DAPM routing?
> For example to the HeadsetL, HeadsetR, HandsFreeL and HandsFreeR? How
> does it than would work?
> If this is possible, than I can handle the correct power up/down
> sequences required for the twl4030 codec.
My two cents: Would it be possible to implement 'fake' PGA or amplifier
into TWL outputs which only controls the power state of mixer and mux?


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