ALSA: oxfw: register the size of PCM period to AMDTP domain

This commit is a preparation to share the size of PCM period between
PCM substreams on AMDTP streams in the same domain. At this time,
the size of PCM period in PCM substream which starts AMDTP streams in the
same domain is recorded.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20191007110532.30270-5-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/oxfw/oxfw-midi.c

@@ -18,7 +18,7 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream)
 
 	mutex_lock(&oxfw->mutex);
 
-	err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->tx_stream, 0, 0);
+	err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->tx_stream, 0, 0, 0);
 	if (err >= 0) {
 		++oxfw->substreams_count;
 		err = snd_oxfw_stream_start_duplex(oxfw);
@@ -45,7 +45,7 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream)
 
 	mutex_lock(&oxfw->mutex);
 
-	err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->rx_stream, 0, 0);
+	err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->rx_stream, 0, 0, 0);
 	if (err >= 0) {
 		++oxfw->substreams_count;
 		err = snd_oxfw_stream_start_duplex(oxfw);

sound/firewire/oxfw/oxfw-pcm.c

@@ -221,10 +221,11 @@ static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		unsigned int rate = params_rate(hw_params);
 		unsigned int channels = params_channels(hw_params);
+		unsigned int frames_per_period = params_period_size(hw_params);
 
 		mutex_lock(&oxfw->mutex);
 		err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->tx_stream,
-						     rate, channels);
+					rate, channels, frames_per_period);
 		if (err >= 0)
 			++oxfw->substreams_count;
 		mutex_unlock(&oxfw->mutex);
@@ -246,10 +247,11 @@ static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 		unsigned int rate = params_rate(hw_params);
 		unsigned int channels = params_channels(hw_params);
+		unsigned int frames_per_period = params_period_size(hw_params);
 
 		mutex_lock(&oxfw->mutex);
 		err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->rx_stream,
-						     rate, channels);
+					rate, channels, frames_per_period);
 		if (err >= 0)
 			++oxfw->substreams_count;
 		mutex_unlock(&oxfw->mutex);

sound/firewire/oxfw/oxfw-stream.c

@@ -244,7 +244,8 @@ static int keep_resources(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
 
 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
 				   struct amdtp_stream *stream,
-				   unsigned int rate, unsigned int pcm_channels)
+				   unsigned int rate, unsigned int pcm_channels,
+				   unsigned int frames_per_period)
 {
 	struct snd_oxfw_stream_formation formation;
 	enum avc_general_plug_dir dir;
@@ -305,6 +306,15 @@ int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
 				return err;
 			}
 		}
+
+		err = amdtp_domain_set_events_per_period(&oxfw->domain,
+							frames_per_period);
+		if (err < 0) {
+			cmp_connection_release(&oxfw->in_conn);
+			if (oxfw->has_output)
+				cmp_connection_release(&oxfw->out_conn);
+			return err;
+		}
 	}
 
 	return 0;

sound/firewire/oxfw/oxfw.h

@@ -103,7 +103,8 @@ int avc_general_inquiry_sig_fmt(struct fw_unit *unit, unsigned int rate,
 int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw);
 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
 				   struct amdtp_stream *stream,
-				   unsigned int rate, unsigned int pcm_channels);
+				   unsigned int rate, unsigned int pcm_channels,
+				   unsigned int frames_per_period);
 int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw);
 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw);
 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw);