[alsa-devel] [PATCH 07/17] firewire-tascam: 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/tascam/tascam-pcm.c    |  4 +++-
 sound/firewire/tascam/tascam-stream.c | 11 ++++++++++-
 sound/firewire/tascam/tascam.h        |  3 ++-
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/sound/firewire/tascam/tascam-pcm.c b/sound/firewire/tascam/tascam-pcm.c
index 2377732caa52..cea26d5eff1a 100644
--- a/sound/firewire/tascam/tascam-pcm.c
+++ b/sound/firewire/tascam/tascam-pcm.c
@@ -99,9 +99,11 @@ 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(&tscm->mutex);
-		err = snd_tscm_stream_reserve_duplex(tscm, rate);
+		err = snd_tscm_stream_reserve_duplex(tscm, rate,
+						     frames_per_period);
 		if (err >= 0)
 			++tscm->substreams_counter;
 		mutex_unlock(&tscm->mutex);
diff --git a/sound/firewire/tascam/tascam-stream.c b/sound/firewire/tascam/tascam-stream.c
index adf69a520b80..8c04a0ad17d9 100644
--- a/sound/firewire/tascam/tascam-stream.c
+++ b/sound/firewire/tascam/tascam-stream.c
@@ -383,7 +383,8 @@ void snd_tscm_stream_destroy_duplex(struct snd_tscm *tscm)
 	destroy_stream(tscm, &tscm->tx_stream);
 }
 
-int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate)
+int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate,
+				   unsigned int frames_per_period)
 {
 	unsigned int curr_rate;
 	int err;
@@ -413,6 +414,14 @@ int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate)
 			fw_iso_resources_free(&tscm->tx_resources);
 			return err;
 		}
+
+		err = amdtp_domain_set_events_per_period(&tscm->domain,
+							frames_per_period);
+		if (err < 0) {
+			fw_iso_resources_free(&tscm->tx_resources);
+			fw_iso_resources_free(&tscm->rx_resources);
+			return err;
+		}
 	}
 
 	return 0;
diff --git a/sound/firewire/tascam/tascam.h b/sound/firewire/tascam/tascam.h
index 15bd335fa07f..32e72a25bf46 100644
--- a/sound/firewire/tascam/tascam.h
+++ b/sound/firewire/tascam/tascam.h
@@ -168,7 +168,8 @@ int snd_tscm_stream_get_clock(struct snd_tscm *tscm,
 int snd_tscm_stream_init_duplex(struct snd_tscm *tscm);
 void snd_tscm_stream_update_duplex(struct snd_tscm *tscm);
 void snd_tscm_stream_destroy_duplex(struct snd_tscm *tscm);
-int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate);
+int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate,
+				   unsigned int frames_per_period);
 int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate);
 void snd_tscm_stream_stop_duplex(struct snd_tscm *tscm);
 
-- 
2.20.1