[alsa-devel] [PATCH v2 2/7] ALSA: hda - add generic functions to set hdac stream params

[Vinod Koul]

From: Jeeja KP <jeeja.kp at intel.com>

This will be used by hda controller driver to
setup stream params in prepare. This function will
setup the bdl and periods.

Signed-off-by: Jeeja KP <jeeja.kp at intel.com>
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty at intel.com>
Signed-off-by: Vinod Koul <vinod.koul at intel.com>
---
 include/sound/hdaudio.h |    2 ++
 sound/hda/hdac_stream.c |   31 +++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index b871f00bb185..227e71956c35 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -417,6 +417,8 @@ void snd_hdac_stream_release(struct hdac_stream *azx_dev);
 int snd_hdac_stream_setup(struct hdac_stream *azx_dev);
 void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev);
 int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev);
+int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
+				unsigned int format_val);
 void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start);
 void snd_hdac_stream_clear(struct hdac_stream *azx_dev);
 void snd_hdac_stream_stop(struct hdac_stream *azx_dev);
diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index 8bd67a824b5e..618e742f527f 100644
--- a/sound/hda/hdac_stream.c
+++ b/sound/hda/hdac_stream.c
@@ -393,6 +393,37 @@ int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev)
 }
 EXPORT_SYMBOL_GPL(snd_hdac_stream_setup_periods);
 
+int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
+				 unsigned int format_val)
+{
+
+	unsigned int bufsize, period_bytes;
+	struct snd_pcm_substream *substream = azx_dev->substream;
+	struct snd_pcm_runtime *runtime;
+	int err;
+
+	if (!substream)
+		return -EINVAL;
+	runtime = substream->runtime;
+	bufsize = snd_pcm_lib_buffer_bytes(substream);
+	period_bytes = snd_pcm_lib_period_bytes(substream);
+
+	if (bufsize != azx_dev->bufsize ||
+	    period_bytes != azx_dev->period_bytes ||
+	    format_val != azx_dev->format_val ||
+	    runtime->no_period_wakeup != azx_dev->no_period_wakeup) {
+		azx_dev->bufsize = bufsize;
+		azx_dev->period_bytes = period_bytes;
+		azx_dev->format_val = format_val;
+		azx_dev->no_period_wakeup = runtime->no_period_wakeup;
+		err = snd_hdac_stream_setup_periods(azx_dev);
+		if (err < 0)
+			return err;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_stream_set_params);
+
 static cycle_t azx_cc_read(const struct cyclecounter *cc)
 {
 	struct hdac_stream *azx_dev = container_of(cc, struct hdac_stream, cc);
-- 
1.7.9.5