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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>
This commit is contained in:
Pan Xiuli 2019-09-27 15:05:31 -05:00 committed by Mark Brown
parent e66e52c5b7
commit 0a1b08345b
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 14 additions and 1 deletions
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13
sound/soc/sof/pcm.c
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@ -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;
}
/*
* 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);