From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
---
Changes in v4:
- none
Changes in v3:
- s/sh/renesas in patch title
Changes in v2:
- none
sound/soc/renesas/rz-ssi.c | 46 ++++++++++++++++++++++++++++++++++++--
1 file changed, 44 insertions(+), 2 deletions(-)
diff --git a/sound/soc/renesas/rz-ssi.c b/sound/soc/renesas/rz-ssi.c
index 486822d79458..d48e2e7356b6 100644
--- a/sound/soc/renesas/rz-ssi.c
+++ b/sound/soc/renesas/rz-ssi.c
@@ -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)
{
@@ -790,8 +816,16 @@ 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:
- rz_ssi_stream_init(strm, substream);
+ if (cmd == SNDRV_PCM_TRIGGER_START)
+ rz_ssi_stream_init(strm, substream);
if (ssi->dma_rt) {
bool is_playback;
@@ -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 = {
--
2.39.2
