[alsa-devel] [PATCH 1/4] ASoC: sun4i-codec: Add support for PA gpio pin

[Maxime Ripard]

On Sat, Nov 21, 2015 at 12:42:41AM +0800, Chen-Yu Tsai wrote:
> >>  static void sun4i_codec_stop_playback(struct sun4i_codec *scodec)
> >>  {
> >> -     /*
> >> -      * FIXME: according to the BSP, we might need to drive a PA
> >> -      *        GPIO low here on some boards
> >> -      */
> >> -
> >>       /* Disable DAC DRQ */
> >>       regmap_update_bits(scodec->regmap, SUN4I_CODEC_DAC_FIFOC,
> >>                          BIT(SUN4I_CODEC_DAC_FIFOC_DAC_DRQ_EN),
> >>                          0);
> >> +
> >> +     if (scodec->gpio_pa)
> >> +             gpiod_set_value_cansleep(scodec->gpio_pa, 0);
> >
> > You should rather plug that into DAPM, using a speaker widget, and a
> > custom event function that will enable or disable the amplifier only
> > when this audio path is going to be used.
> 
> Isn't an "amplifier" widget better suited?

This is exactly what SND_SOC_DAPM_SPK is used for:
http://lxr.free-electrons.com/source/Documentation/sound/alsa/soc/dapm.txt#L273 ;)

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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