Unverified Commit 1fc778f7 authored by Claudiu Beznea's avatar Claudiu Beznea Committed by Mark Brown
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ASoC: renesas: rz-ssi: Add suspend to RAM support 



The SSIF-2 IP is available on the Renesas RZ/G3S SoC. The Renesas RZ/G3S
SoC supports a power-saving mode where power to most of the SoC
components is turned off. Add suspend/resume support to the SSIF-2 driver
to support this power-saving mode.

On SNDRV_PCM_TRIGGER_SUSPEND trigger the SSI is stopped (the stream
user pointer is left untouched to avoid breaking user space and the dma
buffer pointer is set to zero), on SNDRV_PCM_TRIGGER_RESUME software reset
is issued for the SSIF-2 IP and the clocks are re-configured.

Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20241210170953.2936724-18-claudiu.beznea.uj@bp.renesas.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent fc2a31af

sound/soc/renesas/rz-ssi.c

+44 −2
Original line number Diff line number Diff line
@@ -782,6 +782,32 @@ static int rz_ssi_dma_request(struct rz_ssi_priv *ssi, struct device *dev) 
	return -ENODEV;

}



static int rz_ssi_trigger_resume(struct rz_ssi_priv *ssi)

{

	int ret;



	if (rz_ssi_is_stream_running(&ssi->playback) ||

	    rz_ssi_is_stream_running(&ssi->capture))

		return 0;



	ret = rz_ssi_swreset(ssi);

	if (ret)

		return ret;



	return rz_ssi_clk_setup(ssi, ssi->hw_params_cache.rate,

				ssi->hw_params_cache.channels);

}



static void rz_ssi_streams_suspend(struct rz_ssi_priv *ssi)

{

	if (rz_ssi_is_stream_running(&ssi->playback) ||

	    rz_ssi_is_stream_running(&ssi->capture))

		return;



	ssi->playback.dma_buffer_pos = 0;

	ssi->capture.dma_buffer_pos = 0;

}



static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd,

			      struct snd_soc_dai *dai)

{
@@ -790,7 +816,15 @@ static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd, 
	int ret = 0, i, num_transfer = 1;



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_RESUME:

		ret = rz_ssi_trigger_resume(ssi);

		if (ret)

			return ret;



		fallthrough;



	case SNDRV_PCM_TRIGGER_START:

		if (cmd == SNDRV_PCM_TRIGGER_START)

			rz_ssi_stream_init(strm, substream);



		if (ssi->dma_rt) {
@@ -819,6 +853,12 @@ static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd, 


		ret = rz_ssi_start(ssi, strm);

		break;



	case SNDRV_PCM_TRIGGER_SUSPEND:

		rz_ssi_stop(ssi, strm);

		rz_ssi_streams_suspend(ssi);

		break;



	case SNDRV_PCM_TRIGGER_STOP:

		rz_ssi_stop(ssi, strm);

		rz_ssi_stream_quit(ssi, strm);
@@ -958,7 +998,8 @@ static const struct snd_soc_dai_ops rz_ssi_dai_ops = { 
static const struct snd_pcm_hardware rz_ssi_pcm_hardware = {

	.info			= SNDRV_PCM_INFO_INTERLEAVED	|

				  SNDRV_PCM_INFO_MMAP		|

				  SNDRV_PCM_INFO_MMAP_VALID,

				  SNDRV_PCM_INFO_MMAP_VALID	|

				  SNDRV_PCM_INFO_RESUME,

	.buffer_bytes_max	= PREALLOC_BUFFER,

	.period_bytes_min	= 32,

	.period_bytes_max	= 8192,
@@ -1201,6 +1242,7 @@ static int rz_ssi_runtime_resume(struct device *dev) 


static const struct dev_pm_ops rz_ssi_pm_ops = {

	RUNTIME_PM_OPS(rz_ssi_runtime_suspend, rz_ssi_runtime_resume, NULL)

	SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)

};



static struct platform_driver rz_ssi_driver = {