[alsa-devel] [PATCH 09/17] fireface: register the size of PCM period to AMDTP domain

[Takashi Sakamoto]

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 at sakamocchi.jp>
---
 sound/firewire/fireface/ff-pcm.c    |  3 ++-
 sound/firewire/fireface/ff-stream.c | 11 ++++++++++-
 sound/firewire/fireface/ff.h        |  3 ++-
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/sound/firewire/fireface/ff-pcm.c b/sound/firewire/fireface/ff-pcm.c
index 9eab3ad283ce..4f2208202494 100644
--- a/sound/firewire/fireface/ff-pcm.c
+++ b/sound/firewire/fireface/ff-pcm.c
@@ -211,9 +211,10 @@ static int pcm_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 frames_per_period = params_period_size(hw_params);
 
 		mutex_lock(&ff->mutex);
-		err = snd_ff_stream_reserve_duplex(ff, rate);
+		err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period);
 		if (err >= 0)
 			++ff->substreams_counter;
 		mutex_unlock(&ff->mutex);
diff --git a/sound/firewire/fireface/ff-stream.c b/sound/firewire/fireface/ff-stream.c
index e8e6f9fd6433..d05e7d3055e1 100644
--- a/sound/firewire/fireface/ff-stream.c
+++ b/sound/firewire/fireface/ff-stream.c
@@ -106,7 +106,8 @@ void snd_ff_stream_destroy_duplex(struct snd_ff *ff)
 	destroy_stream(ff, &ff->tx_stream);
 }
 
-int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate)
+int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
+				 unsigned int frames_per_period)
 {
 	unsigned int curr_rate;
 	enum snd_ff_clock_src src;
@@ -150,6 +151,14 @@ int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate)
 		err = ff->spec->protocol->allocate_resources(ff, rate);
 		if (err < 0)
 			return err;
+
+		err = amdtp_domain_set_events_per_period(&ff->domain,
+							 frames_per_period);
+		if (err < 0) {
+			fw_iso_resources_free(&ff->tx_resources);
+			fw_iso_resources_free(&ff->rx_resources);
+			return err;
+		}
 	}
 
 	return 0;
diff --git a/sound/firewire/fireface/ff.h b/sound/firewire/fireface/ff.h
index b4c22ca6079e..970d4ae571ee 100644
--- a/sound/firewire/fireface/ff.h
+++ b/sound/firewire/fireface/ff.h
@@ -139,7 +139,8 @@ int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,
 				      enum snd_ff_stream_mode *mode);
 int snd_ff_stream_init_duplex(struct snd_ff *ff);
 void snd_ff_stream_destroy_duplex(struct snd_ff *ff);
-int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate);
+int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
+				 unsigned int frames_per_period);
 int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate);
 void snd_ff_stream_stop_duplex(struct snd_ff *ff);
 void snd_ff_stream_update_duplex(struct snd_ff *ff);
-- 
2.20.1