* [RESEND PATCH v3] ASoC: fsl_sai: Move clock operation to PM runtime
@ 2019-05-07 14:06 Daniel Baluta
2019-05-07 23:11 ` Nicolin Chen
0 siblings, 1 reply; 2+ messages in thread
From: Daniel Baluta @ 2019-05-07 14:06 UTC (permalink / raw)
To: broonie
Cc: S.j. Wang, timur, nicoleotsuka, festevam, tiwai, dl-linux-imx,
alsa-devel, linux-kernel, Daniel Baluta
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>
Reviewed-by: Viorel Suman <viorel.suman@nxp.com>
---
- initially part of this 3 patch series https://patchwork.kernel.org/cover/10911519/
- first 2 patches were merged
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 8593269156bd..d58cc3ae90d8 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 = {
@@ -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 */
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [RESEND PATCH v3] ASoC: fsl_sai: Move clock operation to PM runtime
2019-05-07 14:06 [RESEND PATCH v3] ASoC: fsl_sai: Move clock operation to PM runtime Daniel Baluta
@ 2019-05-07 23:11 ` Nicolin Chen
0 siblings, 0 replies; 2+ messages in thread
From: Nicolin Chen @ 2019-05-07 23:11 UTC (permalink / raw)
To: Daniel Baluta
Cc: broonie, S.j. Wang, timur, festevam, tiwai, dl-linux-imx,
alsa-devel, linux-kernel
On Tue, May 07, 2019 at 02:06:52PM +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>
> Reviewed-by: Viorel Suman <viorel.suman@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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