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SubjectRe: [PATCH 3/3 v3] ASoC: fsl_sai: Move clock operation to PM runtime
Date
Hi Daniel,

On Du, 2019-04-21 at 19:39 +0000, Daniel Baluta wrote:
> From: Shengjiu Wang <shengjiu.wang@nxp.com>
>
> Turn off/on clocks when device enters suspend/resume. This
> can help saving power.
>
> As a further optimization, we turn off/on mclk only when SAI
> is in master mode because otherwise mclk is externally provided.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
> ---
>  sound/soc/fsl/fsl_sai.c | 60 ++++++++++++++++++++++++++++++++++-------
>  1 file changed, 50 insertions(+), 10 deletions(-)
>
> diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> index 8623b7f882b9..13a462360ed3 100644
> --- a/sound/soc/fsl/fsl_sai.c
> +++ b/sound/soc/fsl/fsl_sai.c
> @@ -596,15 +596,8 @@ static int fsl_sai_startup(struct snd_pcm_substream *substream,
>  {
>   struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
>   bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
> - struct device *dev = &sai->pdev->dev;
>   int ret;
>  
> - ret = clk_prepare_enable(sai->bus_clk);
> - if (ret) {
> - dev_err(dev, "failed to enable bus clock: %d\n", ret);
> - return ret;
> - }
> -
>   regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE,
>      FSL_SAI_CR3_TRCE);
>  
> @@ -621,8 +614,6 @@ static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
>   bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
>  
>   regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE, 0);
> -
> - clk_disable_unprepare(sai->bus_clk);
>  }
>  
>  static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
> @@ -932,6 +923,16 @@ static int fsl_sai_runtime_suspend(struct device *dev)
>  {
>   struct fsl_sai *sai = dev_get_drvdata(dev);
>  
> + if (!sai->is_slave_mode) {
This check is redundant as the bits in sai->mclk_streams are set/unset for master
mode only, please check fsl_sai_hw_params and fsl_sai_hw_free functions.

> + if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE))
> + clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[0]]);
> +
> + if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK))
> + clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[1]]);
> + }
> +
> + clk_disable_unprepare(sai->bus_clk);
> +
>   regcache_cache_only(sai->regmap, true);
>   regcache_mark_dirty(sai->regmap);
>  
> @@ -941,6 +942,27 @@ static int fsl_sai_runtime_suspend(struct device *dev)
>  static int fsl_sai_runtime_resume(struct device *dev)
>  {
>   struct fsl_sai *sai = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = clk_prepare_enable(sai->bus_clk);
> + if (ret) {
> + dev_err(dev, "failed to enable bus clock: %d\n", ret);
> + return ret;
> + }
> +
> + if (!sai->is_slave_mode) {
> + if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK)) {
> + ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[1]]);
> + if (ret)
> + goto disable_bus_clk;
> + }
> +
> + if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE)) {
> + ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[0]]);
> + if (ret)
> + goto disable_tx_clk;
> + }
> + }
>  
>   regcache_cache_only(sai->regmap, false);
>   regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
> @@ -948,7 +970,25 @@ static int fsl_sai_runtime_resume(struct device *dev)
>   usleep_range(1000, 2000);
>   regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
>   regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
> - return regcache_sync(sai->regmap);
> +
> + ret = regcache_sync(sai->regmap);
> + if (ret)
> + goto disable_rx_clk;
> +
> + return 0;
> +
> +disable_rx_clk:
> + if (!sai->is_slave_mode &&
> +     (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE)))
> + clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[0]]);
> +disable_tx_clk:
> + if (!sai->is_slave_mode &&
> +     (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK)))
> + clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[1]]);
> +disable_bus_clk:
> + clk_disable_unprepare(sai->bus_clk);
> +
> + return ret;
>  }
>  #endif /* CONFIG_PM */
>  
> -- 
> 2.17.1
>
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