diff mbox series

[v3,3/3] ASoC: fsl_sai: Move clock operation to PM runtime

Message ID 20190422190213.30726-4-daniel.baluta@nxp.com (mailing list archive)
State New, archived
Headers show
Series Add runtime PM for SAI digital audio interface | expand

Commit Message

Daniel Baluta April 22, 2019, 7:02 p.m. UTC 
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 | 54 +++++++++++++++++++++++++++++++++--------
 1 file changed, 44 insertions(+), 10 deletions(-)

Comments

Daniel Baluta April 26, 2019, 12:11 p.m. UTC | #1 
Hi Mark,

This is the only patch in the series that wasn't applied.

On Mon, Apr 22, 2019 at 10:03 PM Daniel Baluta <daniel.baluta@nxp.com> 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 | 54 +++++++++++++++++++++++++++++++++--------
>  1 file changed, 44 insertions(+), 10 deletions(-)
>
> diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> index 8623b7f882b9..7fd1a81ec1aa 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 +923,14 @@ static int fsl_sai_runtime_suspend(struct device *dev)
>  {
>         struct fsl_sai *sai = dev_get_drvdata(dev);
>
> +       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 +940,25 @@ 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->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 +966,23 @@ 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->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE))
> +               clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[0]]);
> +disable_tx_clk:
> +       if (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
>
diff mbox series

Patch

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 8623b7f882b9..7fd1a81ec1aa 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 +923,14 @@  static int fsl_sai_runtime_suspend(struct device *dev)
 {
 	struct fsl_sai *sai = dev_get_drvdata(dev);
 
+	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 +940,25 @@  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->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 +966,23 @@  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->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE))
+		clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[0]]);
+disable_tx_clk:
+	if (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 */