diff options
| author | olivier moysan <olivier.moysan@st.com> | 2017-06-16 14:15:34 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-06-16 18:58:58 +0100 |
| commit | 701a6ec3a3f8d30bdb45ee025fb61f7a934b6cad (patch) | |
| tree | c8a028289bd0becb0b66f2fca0dff64ae9143d44 /sound/soc | |
| parent | 1c77603136d00368b8cd7c10d1ca4bad5952a136 (diff) | |
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>
Diffstat (limited to 'sound/soc')
| -rw-r--r-- | sound/soc/stm/stm32_sai_sub.c | 14 |
1 files changed, 14 insertions, 0 deletions
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); + clk_disable_unprepare(sai->sai_ck); sai->substream = NULL; } |