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Keep playback URBs running continuously between open/close cycles via ghost mode

This commit is contained in:
Marvin 2026-06-09 15:23:03 -03:00
parent 54447e376b
commit 32986d7934
2 changed files with 18 additions and 11 deletions
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1
us144mkii_pcm.c
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@ -128,6 +128,7 @@ int tascam_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_
usb_kill_anchored_urbs(&tascam->feedback_anchor);
usb_kill_anchored_urbs(&tascam->capture_anchor);
atomic_set(&tascam->active_urbs, 0);
tascam->running_ghost_playback = false;
u16 stream_mode = (tascam->dev_id == USB_PID_TASCAM_US200) ? MODE_VAL_STREAM_START_US200 : MODE_VAL_STREAM_START;
err = us144mkii_configure_device_for_rate(tascam, rate, stream_mode);

26
us144mkii_playback.c
View File

@ -130,8 +130,6 @@ static int tascam_playback_close(struct snd_pcm_substream *substream)
{
struct tascam_card *tascam = snd_pcm_substream_chip(substream);
atomic_set(&tascam->playback_active, 0);
usb_kill_anchored_urbs(&tascam->playback_anchor);
usb_kill_anchored_urbs(&tascam->feedback_anchor);
tascam->playback_substream = NULL;
return 0;
}
@ -140,18 +138,21 @@ static int tascam_playback_prepare(struct snd_pcm_substream *substream)
{
struct tascam_card *tascam = snd_pcm_substream_chip(substream);
usb_kill_anchored_urbs(&tascam->playback_anchor);
usb_kill_anchored_urbs(&tascam->feedback_anchor);
tascam->driver_playback_pos = 0;
tascam->playback_frames_consumed = 0;
tascam->last_pb_period_pos = 0;
tascam->feedback_synced = false;
tascam->running_ghost_playback = false;
if (tascam->running_ghost_playback)
return 0;
usb_kill_anchored_urbs(&tascam->playback_anchor);
usb_kill_anchored_urbs(&tascam->feedback_anchor);
tascam->feedback_urb_skip_count = 4;
tascam->phase_accum = 0;
tascam->freq_q16 = div_u64(((u64)tascam->current_rate << 16), 8000);
tascam->running_ghost_playback = false;
prepare_urb_descriptors(tascam);
return 0;
}
@ -181,8 +182,6 @@ static int tascam_playback_trigger(struct snd_pcm_substream *substream, int cmd)
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
atomic_set(&tascam->playback_active, 0);
/* Fall back to ghost playback if capture/midi active */
if (atomic_read(&tascam->stream_refs) > 0)
tascam->running_ghost_playback = true;
break;
default:
@ -199,8 +198,15 @@ static snd_pcm_uframes_t tascam_playback_pointer(struct snd_pcm_substream *subst
unsigned long flags;
u64 pos;
if (!atomic_read(&tascam->playback_active))
if (!atomic_read(&tascam->playback_active)) {
if (tascam->running_ghost_playback) {
spin_lock_irqsave(&tascam->lock, flags);
pos = tascam->playback_frames_consumed;
spin_unlock_irqrestore(&tascam->lock, flags);
return (snd_pcm_uframes_t)pos;
}
return 0;
}
spin_lock_irqsave(&tascam->lock, flags);
pos = tascam->playback_frames_consumed;