From: Claudiu Beznea claudiu.beznea.uj@bp.renesas.com
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 ---
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 = {