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 --- sound/soc/stm/stm32_sai_sub.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c index 3fb9513cedb2..3aa1cf262402 100644 --- a/sound/soc/stm/stm32_sai_sub.c +++ b/sound/soc/stm/stm32_sai_sub.c @@ -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; }