diff options
Diffstat (limited to 'sound/firewire/dice/dice-pcm.c')
-rw-r--r-- | sound/firewire/dice/dice-pcm.c | 75 |
1 files changed, 6 insertions, 69 deletions
diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c index 2e531bd..b185391 100644 --- a/sound/firewire/dice/dice-pcm.c +++ b/sound/firewire/dice/dice-pcm.c @@ -169,65 +169,11 @@ static int playback_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct snd_dice *dice = substream->private_data; - unsigned int mode, rate, channels, i; - int err; - - mutex_lock(&dice->mutex); - snd_dice_stream_stop(dice); - mutex_unlock(&dice->mutex); - - err = snd_pcm_lib_alloc_vmalloc_buffer(substream, - params_buffer_bytes(hw_params)); - if (err < 0) - return err; - - rate = params_rate(hw_params); - err = snd_dice_transaction_set_rate(dice, rate); - if (err < 0) - return err; - - if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0) - return err; - - /* - * At 176.4/192.0 kHz, Dice has a quirk to transfer two PCM frames in - * one data block of AMDTP packet. Thus sampling transfer frequency is - * a half of PCM sampling frequency, i.e. PCM frames at 192.0 kHz are - * transferred on AMDTP packets at 96 kHz. Two successive samples of a - * channel are stored consecutively in the packet. This quirk is called - * as 'Dual Wire'. - * For this quirk, blocking mode is required and PCM buffer size should - * be aligned to SYT_INTERVAL. - */ - channels = params_channels(hw_params); - if (mode > 1) { - if (channels > AMDTP_MAX_CHANNELS_FOR_PCM / 2) { - err = -ENOSYS; - return err; - } - - rate /= 2; - channels *= 2; - dice->rx_stream.double_pcm_frames = true; - } else { - dice->rx_stream.double_pcm_frames = false; - } - - amdtp_stream_set_parameters(&dice->rx_stream, rate, channels, - dice->rx_midi_ports[mode]); - if (mode > 1) { - channels /= 2; - - for (i = 0; i < channels; i++) { - dice->rx_stream.pcm_positions[i] = i * 2; - dice->rx_stream.pcm_positions[i + channels] = i * 2 + 1; - } - } - amdtp_stream_set_pcm_format(&dice->rx_stream, params_format(hw_params)); - return 0; + return snd_pcm_lib_alloc_vmalloc_buffer(substream, + params_buffer_bytes(hw_params)); } static int playback_hw_free(struct snd_pcm_substream *substream) @@ -247,21 +193,12 @@ static int playback_prepare(struct snd_pcm_substream *substream) int err; mutex_lock(&dice->mutex); - - if (amdtp_streaming_error(&dice->rx_stream)) - snd_dice_stream_stop_packets(dice); - - err = snd_dice_stream_start(dice); - if (err < 0) { - mutex_unlock(&dice->mutex); - return err; - } - + err = snd_dice_stream_start(dice, substream->runtime->rate); mutex_unlock(&dice->mutex); + if (err >= 0) + amdtp_stream_pcm_prepare(&dice->rx_stream); - amdtp_stream_pcm_prepare(&dice->rx_stream); - - return 0; + return err; } static int playback_trigger(struct snd_pcm_substream *substream, int cmd) |