[alsa-devel] [PATCH 2/3] ASoC: add device_buffer in asoc

[Vinod Koul]

This adds a new callback "buffer" in dai_ops and platform. The runtime->delay
is reported to sound core as sum of delay and buffer value. The buffer value is
also reported independently to pcm core for error checks

Signed-off-by: Vinod Koul <vinod.koul at linux.intel.com>
---
 include/sound/soc-dai.h |    6 ++++++
 include/sound/soc.h     |    6 ++++++
 sound/soc/soc-pcm.c     |   13 ++++++++++++-
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
index 628db7b..b0c84df 100644
--- a/include/sound/soc-dai.h
+++ b/include/sound/soc-dai.h
@@ -182,6 +182,12 @@ struct snd_soc_dai_ops {
 	 */
 	snd_pcm_sframes_t (*delay)(struct snd_pcm_substream *,
 		struct snd_soc_dai *);
+	/*
+	 * For hardware based buffer reporting
+	 * Optional.
+	 */
+	snd_pcm_sframes_t (*buffer)(struct snd_pcm_substream *,
+		struct snd_soc_dai *);
 };
 
 /*
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 313b766..f50bdf9 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -795,6 +795,12 @@ struct snd_soc_platform_driver {
 	 */
 	snd_pcm_sframes_t (*delay)(struct snd_pcm_substream *,
 		struct snd_soc_dai *);
+	/*
+	 * For hardware based buffer reporting
+	 * Optional.
+	 */
+	snd_pcm_sframes_t (*buffer)(struct snd_pcm_substream *,
+		struct snd_soc_dai *);
 
 	/* platform stream pcm ops */
 	struct snd_pcm_ops *ops;
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index ef22d0b..605337f 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -674,6 +674,7 @@ static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	snd_pcm_uframes_t offset = 0;
 	snd_pcm_sframes_t delay = 0;
+	snd_pcm_sframes_t buffer = 0;
 
 	if (platform->driver->ops && platform->driver->ops->pointer)
 		offset = platform->driver->ops->pointer(substream);
@@ -687,7 +688,17 @@ static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 	if (platform->driver->delay)
 		delay += platform->driver->delay(substream, codec_dai);
 
-	runtime->delay = delay;
+	if (cpu_dai->driver->ops->buffer)
+		buffer += cpu_dai->driver->ops->buffer(substream, cpu_dai);
+
+	if (codec_dai->driver->ops->buffer)
+		buffer += codec_dai->driver->ops->buffer(substream, codec_dai);
+
+	if (platform->driver->buffer)
+		buffer += platform->driver->buffer(substream, codec_dai);
+
+	runtime->delay = delay + buffer;
+	runtime->device_buffer = buffer;
 
 	return offset;
 }
-- 
1.7.9.5