From: Ranjani Sridharan ranjani.sridharan@linux.intel.com

In the case of IPC4, a pipeline is only paused during STOP/PAUSE/SUSPEND triggers and the FW keeps the host DMA running when a pipeline is paused. The start/stop tests iterate through STOP/START triggers without involving a hw_free. This means that the pipeline state will only toggle between PAUSED (during the STOP trigger) and RUNNING (during the START trigger). So this test should be treated in the same way as a PAUSE_PUSH/PAUSE_RELEASE test and the DMA should be kept running when toggling the pipeline states between PAUSED and RUNNING.

Since there is no way to tell if a STOP trigger will be followed by hw_free or not, this patch proposes to always skip DMA stop during the STOP trigger and handle it later during hw_free. Introduce a new flag in struct sof_ipc_pcm_ops, delayed_platform_trigger, that will be used to ensure that the host DMA will not be stopped during the STOP/PAUSE/RELEASE triggers and set it for IPC4. The platform_trigger call to stop the DMA will be invoked during PCM hw_free instead when the pipeline is reset.

Signed-off-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Péter Ujfalusi peter.ujfalusi@linux.intel.com Signed-off-by: Peter Ujfalusi peter.ujfalusi@linux.intel.com --- sound/soc/sof/ipc4-pcm.c | 3 ++- sound/soc/sof/pcm.c | 23 +++++++++++++++-------- sound/soc/sof/sof-audio.c | 22 ++++++++++++++-------- sound/soc/sof/sof-audio.h | 6 ++++++ 4 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/sound/soc/sof/ipc4-pcm.c b/sound/soc/sof/ipc4-pcm.c index a2cd21256e44..ea19bd0330e2 100644 --- a/sound/soc/sof/ipc4-pcm.c +++ b/sound/soc/sof/ipc4-pcm.c @@ -836,5 +836,6 @@ const struct sof_ipc_pcm_ops ipc4_pcm_ops = { .pcm_setup = sof_ipc4_pcm_setup, .pcm_free = sof_ipc4_pcm_free, .delay = sof_ipc4_pcm_delay, - .ipc_first_on_start = true + .ipc_first_on_start = true, + .platform_stop_during_hw_free = true, }; diff --git a/sound/soc/sof/pcm.c b/sound/soc/sof/pcm.c index 127b68caf9e1..567db32173a8 100644 --- a/sound/soc/sof/pcm.c +++ b/sound/soc/sof/pcm.c @@ -211,16 +211,22 @@ static int sof_pcm_hw_free(struct snd_soc_component *component, dev_dbg(component->dev, "pcm: free stream %d dir %d\n", spcm->pcm.pcm_id, substream->stream);

- /* free PCM in the DSP */ - if (pcm_ops && pcm_ops->hw_free && spcm->prepared[substream->stream]) { - ret = pcm_ops->hw_free(component, substream); - if (ret < 0) - err = ret; + if (spcm->prepared[substream->stream]) { + /* stop DMA first if needed */ + if (pcm_ops && pcm_ops->platform_stop_during_hw_free) + snd_sof_pcm_platform_trigger(sdev, substream, SNDRV_PCM_TRIGGER_STOP); + + /* free PCM in the DSP */ + if (pcm_ops && pcm_ops->hw_free) { + ret = pcm_ops->hw_free(component, substream); + if (ret < 0) + err = ret; + }

spcm->prepared[substream->stream] = false; }

- /* stop DMA */ + /* reset DMA */ ret = snd_sof_pcm_platform_hw_free(sdev, substream); if (ret < 0) { dev_err(component->dev, "error: platform hw free failed\n"); @@ -362,8 +368,9 @@ static int sof_pcm_trigger(struct snd_soc_component *component, case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: case SNDRV_PCM_TRIGGER_STOP: - /* invoke platform trigger to stop DMA even if pcm_ops failed */ - snd_sof_pcm_platform_trigger(sdev, substream, cmd); + /* invoke platform trigger to stop DMA even if pcm_ops isn't set or if it failed */ + if (!pcm_ops || (pcm_ops && !pcm_ops->platform_stop_during_hw_free)) + snd_sof_pcm_platform_trigger(sdev, substream, cmd); break; default: break; diff --git a/sound/soc/sof/sof-audio.c b/sound/soc/sof/sof-audio.c index 7651644fcd62..1cbda595c518 100644 --- a/sound/soc/sof/sof-audio.c +++ b/sound/soc/sof/sof-audio.c @@ -805,16 +805,22 @@ int sof_pcm_stream_free(struct snd_sof_dev *sdev, struct snd_pcm_substream *subs const struct sof_ipc_pcm_ops *pcm_ops = sof_ipc_get_ops(sdev, pcm); int ret;

- /* Send PCM_FREE IPC to reset pipeline */ - if (pcm_ops && pcm_ops->hw_free && spcm->prepared[substream->stream]) { - ret = pcm_ops->hw_free(sdev->component, substream); - if (ret < 0) - return ret; - } + if (spcm->prepared[substream->stream]) { + /* stop DMA first if needed */ + if (pcm_ops && pcm_ops->platform_stop_during_hw_free) + snd_sof_pcm_platform_trigger(sdev, substream, SNDRV_PCM_TRIGGER_STOP); + + /* Send PCM_FREE IPC to reset pipeline */ + if (pcm_ops && pcm_ops->hw_free) { + ret = pcm_ops->hw_free(sdev->component, substream); + if (ret < 0) + return ret; + }

- spcm->prepared[substream->stream] = false; + spcm->prepared[substream->stream] = false; + }

- /* stop the DMA */ + /* reset the DMA */ ret = snd_sof_pcm_platform_hw_free(sdev, substream); if (ret < 0) return ret; diff --git a/sound/soc/sof/sof-audio.h b/sound/soc/sof/sof-audio.h index 6c64376858b3..a090a9eb4828 100644 --- a/sound/soc/sof/sof-audio.h +++ b/sound/soc/sof/sof-audio.h @@ -108,6 +108,11 @@ struct snd_sof_dai_config_data { * STOP pcm trigger * @ipc_first_on_start: Send IPC before invoking platform trigger during * START/PAUSE_RELEASE triggers + * @platform_stop_during_hw_free: Invoke the platform trigger during hw_free. This is needed for + * IPC4 where a pipeline is only paused during stop/pause/suspend + * triggers. The FW keeps the host DMA running in this case and + * therefore the host must do the same and should stop the DMA during + * hw_free. */ struct sof_ipc_pcm_ops { int (*hw_params)(struct snd_soc_component *component, struct snd_pcm_substream *substream, @@ -123,6 +128,7 @@ struct sof_ipc_pcm_ops { struct snd_pcm_substream *substream); bool reset_hw_params_during_stop; bool ipc_first_on_start; + bool platform_stop_during_hw_free; };

/**