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| author | Pan Xiuli <xiuli.pan@linux.intel.com> | 2019-09-27 22:05:31 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-10-01 19:31:25 +0200 |
| commit | 0a1b08345bc5d9214dc701f8ec5d67c473fab735 (patch) | |
| tree | 290254dc86c6be914423be208c09ea7ae97ae06f | |
| parent | ASoC: SOF: pcm: fix resource leak in hw_free (diff) | |
| download | linux-0a1b08345bc5d9214dc701f8ec5d67c473fab735.tar.xz linux-0a1b08345bc5d9214dc701f8ec5d67c473fab735.zip | |
ASoC: SOF: pcm: harden PCM STOP sequence
The old STOP sequence is: 1. stop DMA 2. send STOP ipc
If delay happen before the steps 1 and 2, the DMA buffer will be empty in
short time and cause pipeline xrun then stop the pipeline.
Then the step 2 ipc stop will return error as pipeline is already stopped.
Suggested change to avoid the issue is to switch the order of steps 1 and 2
for the stop sequence.
Signed-off-by: Pan Xiuli <xiuli.pan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190927200538.660-7-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | sound/soc/sof/pcm.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/sound/soc/sof/pcm.c b/sound/soc/sof/pcm.c index fa7769dd825c..2b876d497447 100644 --- a/sound/soc/sof/pcm.c +++ b/sound/soc/sof/pcm.c @@ -323,6 +323,7 @@ static int sof_pcm_trigger(struct snd_pcm_substream *substream, int cmd) struct sof_ipc_stream stream; struct sof_ipc_reply reply; bool reset_hw_params = false; + bool ipc_first = false; int ret; /* nothing to do for BE */ @@ -343,6 +344,7 @@ static int sof_pcm_trigger(struct snd_pcm_substream *substream, int cmd) switch (cmd) { case SNDRV_PCM_TRIGGER_PAUSE_PUSH: stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_PAUSE; + ipc_first = true; break; case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_RELEASE; @@ -363,6 +365,7 @@ static int sof_pcm_trigger(struct snd_pcm_substream *substream, int cmd) case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_STOP: stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_STOP; + ipc_first = true; reset_hw_params = true; break; default: @@ -370,12 +373,22 @@ static int sof_pcm_trigger(struct snd_pcm_substream *substream, int cmd) return -EINVAL; } - snd_sof_pcm_platform_trigger(sdev, substream, cmd); + /* + * DMA and IPC sequence is different for start and stop. Need to send + * STOP IPC before stop DMA + */ + if (!ipc_first) + snd_sof_pcm_platform_trigger(sdev, substream, cmd); /* send IPC to the DSP */ ret = sof_ipc_tx_message(sdev->ipc, stream.hdr.cmd, &stream, sizeof(stream), &reply, sizeof(reply)); + /* need to STOP DMA even if STOP IPC failed */ + if (ipc_first) + snd_sof_pcm_platform_trigger(sdev, substream, cmd); + + /* free PCM if reset_hw_params is set and the STOP IPC is successful */ if (!ret && reset_hw_params) ret = sof_pcm_dsp_pcm_free(substream, sdev, spcm); |