linux-kernel - [PATCH 3/4] ASoC: arizona: Add DVFS handling for sample rate control

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Date:	Mon, 9 Jun 2014 16:03:56 +0100
From:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To:	sameo@...ux.intel.com, lee.jones@...aro.org,
	ckeepax@...nsource.wolfsonmicro.com, broonie@...nel.org,
	lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.de
Cc:	alsa-devel@...a-project.org, patches@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] ASoC: arizona: Add DVFS handling for sample rate
	control

Some codecs need to boost DVFS for higher sample rates.

Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
---
 sound/soc/codecs/arizona.c |   22 +++++++++++++++++++++-
 1 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/sound/soc/codecs/arizona.c b/sound/soc/codecs/arizona.c
index 1b14105..7e33d1b 100644
--- a/sound/soc/codecs/arizona.c
+++ b/sound/soc/codecs/arizona.c
@@ -1135,7 +1135,7 @@ static int arizona_hw_params_rate(struct snd_pcm_substream *substream,
 	struct arizona_priv *priv = snd_soc_codec_get_drvdata(codec);
 	struct arizona_dai_priv *dai_priv = &priv->dai[dai->id - 1];
 	int base = dai->driver->base;
-	int i, sr_val;
+	int i, sr_val, ret;
 
 	/*
 	 * We will need to be more flexible than this in future,
@@ -1151,6 +1151,26 @@ static int arizona_hw_params_rate(struct snd_pcm_substream *substream,
 	}
 	sr_val = i;
 
+	switch (priv->arizona->type) {
+	case WM5102:
+	case WM8997:
+		if (arizona_sr_vals[sr_val] >= 88200)
+			ret = arizona_dvfs_up(priv->arizona,
+					      ARIZONA_DVFS_SR1_RQ);
+		else
+			ret = arizona_dvfs_down(priv->arizona,
+						ARIZONA_DVFS_SR1_RQ);
+
+		if (ret != 0) {
+			arizona_aif_err(dai, "Failed to change DVFS %d\n", ret);
+			return ret;
+		}
+		break;
+
+	default:
+		break;
+	}
+
 	switch (dai_priv->clk) {
 	case ARIZONA_CLK_SYSCLK:
 		snd_soc_update_bits(codec, ARIZONA_SAMPLE_RATE_1,
-- 
1.7.2.5


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