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