From:   Claudiu Beznea <claudiu.beznea@microchip.com>
To:     <lgirdwood@gmail.com>, <broonie@kernel.org>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <perex@perex.cz>,
        <tiwai@suse.com>, <nicolas.ferre@microchip.com>,
        <alexandre.belloni@bootlin.com>
CC:     <alsa-devel@alsa-project.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        Claudiu Beznea <claudiu.beznea@microchip.com>
Subject: [PATCH v2 1/3] ASoC: soc-pcm: add option to start DMA after DAI
Date:   Fri, 17 Feb 2023 14:41:49 +0200
Message-ID: <20230217124151.236216-2-claudiu.beznea@microchip.com>
In-Reply-To: <20230217124151.236216-1-claudiu.beznea@microchip.com>
References: <20230217124151.236216-1-claudiu.beznea@microchip.com>
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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>
---
 include/sound/soc-component.h |  2 ++
 sound/soc/soc-pcm.c           | 27 ++++++++++++++++++++++-----
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/include/sound/soc-component.h b/include/sound/soc-component.h
index 3203d35bc8c1..0814ed143864 100644
--- 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 005b179a770a..5eb056b942ce 100644
--- 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;
-- 
2.34.1