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Commit 1947dadf authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: wm8994: Don't bother lowering clock dividers inside idle AIFs 



This increases the chances we'll manage to hit a partially configured
state on restart and the power savings are extremely small.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 172b4c5c

sound/soc/codecs/wm8994.c

+0 −29
Original line number Diff line number Diff line
@@ -2623,33 +2623,6 @@ static int wm8994_aif3_hw_params(struct snd_pcm_substream *substream, 
	return snd_soc_update_bits(codec, aif1_reg, WM8994_AIF1_WL_MASK, aif1);

}



static void wm8994_aif_shutdown(struct snd_pcm_substream *substream,

				struct snd_soc_dai *dai)

{

	struct snd_soc_codec *codec = dai->codec;

	int rate_reg = 0;



	switch (dai->id) {

	case 1:

		rate_reg = WM8994_AIF1_RATE;

		break;

	case 2:

		rate_reg = WM8994_AIF2_RATE;

		break;

	default:

		break;

	}



	/* If the DAI is idle then configure the divider tree for the

	 * lowest output rate to save a little power if the clock is

	 * still active (eg, because it is system clock).

	 */

	if (rate_reg && !dai->playback_active && !dai->capture_active)

		snd_soc_update_bits(codec, rate_reg,

				    WM8994_AIF1_SR_MASK |

				    WM8994_AIF1CLK_RATE_MASK, 0x9);

}



static int wm8994_aif_mute(struct snd_soc_dai *codec_dai, int mute)

{

	struct snd_soc_codec *codec = codec_dai->codec;
@@ -2731,7 +2704,6 @@ static const struct snd_soc_dai_ops wm8994_aif1_dai_ops = { 
	.set_sysclk	= wm8994_set_dai_sysclk,

	.set_fmt	= wm8994_set_dai_fmt,

	.hw_params	= wm8994_hw_params,

	.shutdown	= wm8994_aif_shutdown,

	.digital_mute	= wm8994_aif_mute,

	.set_pll	= wm8994_set_fll,

	.set_tristate	= wm8994_set_tristate,
@@ -2741,7 +2713,6 @@ static const struct snd_soc_dai_ops wm8994_aif2_dai_ops = { 
	.set_sysclk	= wm8994_set_dai_sysclk,

	.set_fmt	= wm8994_set_dai_fmt,

	.hw_params	= wm8994_hw_params,

	.shutdown	= wm8994_aif_shutdown,

	.digital_mute   = wm8994_aif_mute,

	.set_pll	= wm8994_set_fll,

	.set_tristate	= wm8994_set_tristate,