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ASoC: fsl_sai: Move clock operation to PM runtime 

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>
Reviewed-by: Viorel Suman <viorel.suman@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Shengjiu Wang 2019-05-07 14:06:52 +00:00 committed by Mark Brown
parent 71ed4bddde
commit c0ffbd64b9
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 44 additions and 10 deletions
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54
sound/soc/fsl/fsl_sai.c
View File

@ -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 = {
@ -935,6 +926,14 @@ 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);
@ -944,6 +943,25 @@ 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);
@ -951,7 +969,23 @@ 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 */