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SoC: stm32: i2s: manage clock power 

Kernel clock management:
Enable/disable I2S kernel clock on audio stream startup/shutdown.

Peripheral clock management:
Manage I2S peripheral clock power through regmap services.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Olivier Moysan 2019-02-08 11:49:54 +01:00 committed by Mark Brown
parent 307cce4a00
commit 6a68eeee0f
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 15 additions and 29 deletions
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44
sound/soc/stm/stm32_i2s.c
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@ -545,9 +545,16 @@ static int stm32_i2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
int ret;
i2s->substream = substream;
ret = clk_prepare_enable(i2s->i2sclk);
if (ret < 0) {
dev_err(cpu_dai->dev, "Failed to enable clock: %d\n", ret);
return ret;
}
spin_lock(&i2s->lock_fd);
i2s->refcount++;
spin_unlock(&i2s->lock_fd);
@ -674,6 +681,8 @@ static void stm32_i2s_shutdown(struct snd_pcm_substream *substream,
regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
I2S_CGFR_MCKOE, (unsigned int)~I2S_CGFR_MCKOE);
clk_disable_unprepare(i2s->i2sclk);
}
static int stm32_i2s_dai_probe(struct snd_soc_dai *cpu_dai)
@ -874,49 +883,26 @@ static int stm32_i2s_probe(struct platform_device *pdev)
if (ret)
return ret;
i2s->regmap = devm_regmap_init_mmio(&pdev->dev, i2s->base,
i2s->regmap_conf);
i2s->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "pclk",
i2s->base, i2s->regmap_conf);
if (IS_ERR(i2s->regmap)) {
dev_err(&pdev->dev, "regmap init failed\n");
return PTR_ERR(i2s->regmap);
}
ret = clk_prepare_enable(i2s->pclk);
if (ret) {
dev_err(&pdev->dev, "Enable pclk failed: %d\n", ret);
return ret;
}
ret = clk_prepare_enable(i2s->i2sclk);
if (ret) {
dev_err(&pdev->dev, "Enable i2sclk failed: %d\n", ret);
goto err_pclk_disable;
}
ret = devm_snd_soc_register_component(&pdev->dev, &stm32_i2s_component,
i2s->dai_drv, 1);
if (ret)
goto err_clocks_disable;
return ret;
ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
&stm32_i2s_pcm_config, 0);
if (ret)
goto err_clocks_disable;
return ret;
/* Set SPI/I2S in i2s mode */
ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
I2S_CGFR_I2SMOD, I2S_CGFR_I2SMOD);
if (ret)
goto err_clocks_disable;
return ret;
err_clocks_disable:
clk_disable_unprepare(i2s->i2sclk);
err_pclk_disable:
clk_disable_unprepare(i2s->pclk);
return ret;
return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
I2S_CGFR_I2SMOD, I2S_CGFR_I2SMOD);
}
static int stm32_i2s_remove(struct platform_device *pdev)