Unverified Commit 54fc4b72 authored by Claudiu Beznea's avatar Claudiu Beznea Committed by Mark Brown
Browse files

ASoC: soc-pcm: add option to start DMA after DAI 



Add option to start DMA component after DAI trigger. This is done
by filling the new struct snd_soc_component_driver::start_dma_last.

Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230228110145.3770525-2-claudiu.beznea@microchip.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent fb1847cc

include/sound/soc-component.h

+2 −0
Original line number Diff line number Diff line
@@ -190,6 +190,8 @@ struct snd_soc_component_driver { 
	bool use_dai_pcm_id;	/* use DAI link PCM ID as PCM device number */

	int be_pcm_base;	/* base device ID for all BE PCMs */



	unsigned int start_dma_last;



#ifdef CONFIG_DEBUG_FS

	const char *debugfs_prefix;

#endif

sound/soc/soc-pcm.c

+22 −5
Original line number Diff line number Diff line
@@ -1088,22 +1088,39 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream, 
static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)

{

	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);

	int ret = -EINVAL, _ret = 0;

	struct snd_soc_component *component;

	int ret = -EINVAL, _ret = 0, start_dma_last = 0, i;

	int rollback = 0;



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		/* Do we need to start dma last? */

		for_each_rtd_components(rtd, i, component) {

			if (component->driver->start_dma_last) {

				start_dma_last = 1;

				break;

			}

		}



		ret = snd_soc_link_trigger(substream, cmd, 0);

		if (ret < 0)

			goto start_err;



		if (start_dma_last) {

			ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);

			if (ret < 0)

				goto start_err;



			ret = snd_soc_pcm_component_trigger(substream, cmd, 0);

		} else {

			ret = snd_soc_pcm_component_trigger(substream, cmd, 0);

			if (ret < 0)

				goto start_err;



			ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);

		}

start_err:

		if (ret < 0)

			rollback = 1;