diff mbox

Applied "ASoC: stm32: sai: manage master clock" to the asoc tree

Message ID E1dLvNX-0005bY-5x@debutante
State New, archived
Headers show

Commit Message

Mark Brown June 16, 2017, 5:49 p.m. UTC
The patch

   ASoC: stm32: sai: manage master clock

has been applied to the asoc tree at


All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

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From 12093366981de5060379ad7fa173a1d459c49572 Mon Sep 17 00:00:00 2001
From: olivier moysan <olivier.moysan@st.com>
Date: Fri, 16 Jun 2017 14:15:34 +0200
Subject: [PATCH] ASoC: stm32: sai: manage master clock

Disable master clock by default, and activate
it only when requested.

Signed-off-by: olivier moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
 sound/soc/stm/stm32_sai_sub.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
diff mbox


diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 2466af0343db..ce48c02db051 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -220,8 +220,15 @@  static int stm32_sai_set_sysclk(struct snd_soc_dai *cpu_dai,
 				int clk_id, unsigned int freq, int dir)
 	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
+	int ret;
 	if ((dir == SND_SOC_CLOCK_OUT) && sai->master) {
+		ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
+					 SAI_XCR1_NODIV,
+					 (unsigned int)~SAI_XCR1_NODIV);
+		if (ret < 0)
+			return ret;
 		sai->mclk_rate = freq;
 		dev_dbg(cpu_dai->dev, "SAI MCLK frequency is %uHz\n", freq);
@@ -356,6 +363,10 @@  static int stm32_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
 	cr1_mask |= SAI_XCR1_SLAVE;
+	/* do not generate master by default */
+	cr1 |= SAI_XCR1_NODIV;
+	cr1_mask |= SAI_XCR1_NODIV;
 	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, cr1_mask, cr1);
 	if (ret < 0) {
 		dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
@@ -652,6 +663,9 @@  static void stm32_sai_shutdown(struct snd_pcm_substream *substream,
 	regmap_update_bits(sai->regmap, STM_SAI_IMR_REGX, SAI_XIMR_MASK, 0);
+	regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, SAI_XCR1_NODIV,
+			   SAI_XCR1_NODIV);
 	sai->substream = NULL;