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ASoC: renesas: rz-ssi: Add suspend to RAM support

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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: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20241210170953.2936724-18-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Claudiu Beznea 2024-12-10 19:09:46 +02:00 • committed by Mark Brown
parent fc2a31affb
commit 1fc778f7c8
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 44 additions and 2 deletions
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44
sound/soc/renesas/rz-ssi.c
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@ -782,6 +782,32 @@ no_dma:
return -ENODEV; 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, static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai) 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; int ret = 0, i, num_transfer = 1;
switch (cmd) { switch (cmd) {
case SNDRV_PCM_TRIGGER_RESUME:
ret = rz_ssi_trigger_resume(ssi);
if (ret)
return ret;
fallthrough;
case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_START:
if (cmd == SNDRV_PCM_TRIGGER_START)
rz_ssi_stream_init(strm, substream); rz_ssi_stream_init(strm, substream);
if (ssi->dma_rt) { 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); ret = rz_ssi_start(ssi, strm);
break; break;
case SNDRV_PCM_TRIGGER_SUSPEND:
rz_ssi_stop(ssi, strm);
rz_ssi_streams_suspend(ssi);
break;
case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_STOP:
rz_ssi_stop(ssi, strm); rz_ssi_stop(ssi, strm);
rz_ssi_stream_quit(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 = { static const struct snd_pcm_hardware rz_ssi_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED | .info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID, SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_RESUME,
.buffer_bytes_max = PREALLOC_BUFFER, .buffer_bytes_max = PREALLOC_BUFFER,
.period_bytes_min = 32, .period_bytes_min = 32,
.period_bytes_max = 8192, .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 = { static const struct dev_pm_ops rz_ssi_pm_ops = {
RUNTIME_PM_OPS(rz_ssi_runtime_suspend, rz_ssi_runtime_resume, NULL) 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 = { static struct platform_driver rz_ssi_driver = {