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ASoC: stm32: sai: manage master clock

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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>
This commit is contained in:
olivier moysan 2017-06-16 14:15:34 +02:00 committed by Mark Brown
parent 1c77603136
commit 701a6ec3a3
1 changed files with 14 additions and 0 deletions
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14
sound/soc/stm/stm32_sai_sub.c
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@ -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);
clk_disable_unprepare(sai->sai_ck);
sai->substream = NULL;
}