[alsa-devel] [PATCH -next] ASoC: pandora: Add DAC regulator support

Liam Girdwood lrg at slimlogic.co.uk
Fri Feb 5 16:16:50 CET 2010

On Fri, 2010-02-05 at 16:29 +0200, Grazvydas Ignotas wrote:
> On Fri, Feb 5, 2010 at 4:08 PM, Liam Girdwood <lrg at slimlogic.co.uk> wrote:
> > On Fri, 2010-02-05 at 15:13 +0200, Grazvydas Ignotas wrote:
> >> Pandora's external DAC is connected to VSIM TWL4030 supply, so let's
> >> start switching it too to save more power.
> >>
> >> Also DAC got it's own DAPM handler and the delay was removed
> >> (it gave on audible improvement).
> >>
> >
> > That's good to hear (pun intended).
> Uh, I meant "no audible improvement". However I've just checked the
> DAC datasheet again and it requires 1ms delay between turning on/off
> the supply and switching /PD pin (connected to
> OMAP3_PANDORA_DAC_POWER_GPIO). Even though I hear no difference,
> adding the delays back just in case. Updated patch attached.
> _______________________________________________

Btw, have you tried turning the volume to mute when the DAC is enabled.
It may lessen the pop at switch on.

Acked-by: Liam Girdwood <lrg at slimlogic.co.uk>

Freelance Developer, SlimLogic Ltd
ASoC and Voltage Regulator Maintainer.

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