From 04c8027764bc82a325d3abc6f39a6a4642a937cb Mon Sep 17 00:00:00 2001 From: Kai Vehmanen Date: Mon, 22 Jul 2019 09:13:43 -0500 Subject: ASoC: SOF: reset DMA state in prepare When application goes through SUSPEND/STOP->PREPARE->START cycle, we should always reprogram the SOF device to start DMA from a known state so that hw_ptr/appl_ptrs remain valid. This is expected by ALSA core as it resets the buffer state as part of prepare (see snd_pcm_do_prepare()). Fix the issue by forcing reconfiguration of the FW with STREAM_PCM_PARAMS in prepare(). Use combined logic to handle prepare and the existing flow to reprogram hw-params after system suspend. Without the fix, first call to pcm pointer() will return an invalid hw_ptr and application may immediately observe XRUN status, unless "start_threshold" SW parameter is set to maximum value by the application. Signed-off-by: Kai Vehmanen Signed-off-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20190722141402.7194-3-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown --- sound/soc/sof/pm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'sound/soc/sof/pm.c') diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c index 278abfd10490..48c6d78d72e2 100644 --- a/sound/soc/sof/pm.c +++ b/sound/soc/sof/pm.c @@ -233,7 +233,7 @@ static int sof_set_hw_params_upon_resume(struct snd_sof_dev *sdev) state = substream->runtime->status->state; if (state == SNDRV_PCM_STATE_SUSPENDED) - spcm->hw_params_upon_resume[dir] = 1; + spcm->prepared[dir] = false; } } -- cgit v1.2.3