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ASoC: stm32: sai: add pm_runtime support 

Enable support of pm_runtime on STM32 SAI driver to allow
SAI power state monitoring.
pm_runtime_put_autosuspend() is called from ASoC framework
on pcm device close.
The pmdown_time delay is available in runtime context, and may be set
in SAI driver to take into account shutdown delay on playback.
However, this shutdown delay is already handled in the DAPMs
of the audio codec linked to SAI CPU DAI.
So, the choice is made, not to support this delay on CPU DAI side.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Link: https://lore.kernel.org/r/20200911081507.7276-1-olivier.moysan@st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Olivier Moysan 2020-09-11 10:15:07 +02:00 committed by Mark Brown
parent 375e2c3525
commit 4e723e7565
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GPG Key ID: 24D68B725D5487D0
1 changed files with 8 additions and 2 deletions
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10
sound/soc/stm/stm32_sai_sub.c
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@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <sound/asoundef.h>
@ -1559,10 +1560,14 @@ static int stm32_sai_sub_probe(struct platform_device *pdev)
ret = snd_soc_register_component(&pdev->dev, &stm32_component,
&sai->cpu_dai_drv, 1);
if (ret)
if (ret) {
snd_dmaengine_pcm_unregister(&pdev->dev);
return ret;
}
return ret;
pm_runtime_enable(&pdev->dev);
return 0;
}
static int stm32_sai_sub_remove(struct platform_device *pdev)
@ -1572,6 +1577,7 @@ static int stm32_sai_sub_remove(struct platform_device *pdev)
clk_unprepare(sai->pdata->pclk);
snd_dmaengine_pcm_unregister(&pdev->dev);
snd_soc_unregister_component(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}