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: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230228110145.3770525-2-claudiu.beznea@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/sound/soc-component.h b/include/sound/soc-component.h
index 3203d35..0814ed1 100644 (file)
--- a/include/sound/soc-component.h
+++ b/include/sound/soc-component.h
@@ -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

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 005b179..5eb056b 100644 (file)
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -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;
 
-               ret = snd_soc_pcm_component_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);
+                       ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
+               }
 start_err:
                if (ret < 0)
                        rollback = 1;