From 6669a11d35bfa37f319da639594cdcbb164085f4 Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Mon, 7 Oct 2019 20:05:30 +0900 Subject: [PATCH] ALSA: firewire-tascam: use the same size of period for PCM substream in AMDTP streams In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream. The number of PCM substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger. This commit replaces the check with the substream count and the value for the size of PCM period. Unlike the other drivers in ALSA firewire stack, no MIDI substream is multiplexed into AMDTP stream. Signed-off-by: Takashi Sakamoto Link: https://lore.kernel.org/r/20191007110532.30270-16-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai --- sound/firewire/tascam/tascam-pcm.c | 34 +++++++++++++++++++++++------- 1 file changed, 26 insertions(+), 8 deletions(-) diff --git a/sound/firewire/tascam/tascam-pcm.c b/sound/firewire/tascam/tascam-pcm.c index cea26d5eff1a..6cd3a420fbdf 100644 --- a/sound/firewire/tascam/tascam-pcm.c +++ b/sound/firewire/tascam/tascam-pcm.c @@ -43,13 +43,13 @@ static int pcm_init_hw_params(struct snd_tscm *tscm, static int pcm_open(struct snd_pcm_substream *substream) { struct snd_tscm *tscm = substream->private_data; + struct amdtp_domain *d = &tscm->domain; enum snd_tscm_clock clock; - unsigned int rate; int err; err = snd_tscm_stream_lock_try(tscm); if (err < 0) - goto end; + return err; err = pcm_init_hw_params(tscm, substream); if (err < 0) @@ -59,19 +59,37 @@ static int pcm_open(struct snd_pcm_substream *substream) if (err < 0) goto err_locked; - if (clock != SND_TSCM_CLOCK_INTERNAL || - amdtp_stream_pcm_running(&tscm->rx_stream) || - amdtp_stream_pcm_running(&tscm->tx_stream)) { + mutex_lock(&tscm->mutex); + + // When source of clock is not internal or any stream is reserved for + // transmission of PCM frames, the available sampling rate is limited + // at current one. + if (clock != SND_TSCM_CLOCK_INTERNAL || tscm->substreams_counter > 0) { + unsigned int frames_per_period = d->events_per_period; + unsigned int rate; + err = snd_tscm_stream_get_rate(tscm, &rate); - if (err < 0) + if (err < 0) { + mutex_unlock(&tscm->mutex); goto err_locked; + } substream->runtime->hw.rate_min = rate; substream->runtime->hw.rate_max = rate; + + err = snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, + frames_per_period, frames_per_period); + if (err < 0) { + mutex_unlock(&tscm->mutex); + goto err_locked; + } } + mutex_unlock(&tscm->mutex); + snd_pcm_set_sync(substream); -end: - return err; + + return 0; err_locked: snd_tscm_stream_lock_release(tscm); return err;