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Commit 701a6ec3 authored by olivier moysan's avatar olivier moysan Committed by Mark Brown
Browse files

ASoC: stm32: sai: manage master clock 



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

Signed-off-by: default avatarolivier moysan <olivier.moysan@st.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 1c776031

sound/soc/stm/stm32_sai_sub.c

+14 −0
Original line number Diff line number Diff line
@@ -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;

}