This is a preparation for userspace applications to change current sampling transmission frequency via ALSA PCM interface.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/dice/dice-stream.c | 44 +++++++++++++++++++++++++++++++++------ 1 file changed, 38 insertions(+), 6 deletions(-)
diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c index e22896aaf346..92f3c345fa59 100644 --- a/sound/firewire/dice/dice-stream.c +++ b/sound/firewire/dice/dice-stream.c @@ -52,19 +52,32 @@ int snd_dice_stream_get_rate_mode(struct snd_dice *dice, unsigned int rate, * This operation has an effect to synchronize GLOBAL_STATUS/GLOBAL_SAMPLE_RATE * to GLOBAL_STATUS. Especially, just after powering on, these are different. */ -static int ensure_phase_lock(struct snd_dice *dice) +static int ensure_phase_lock(struct snd_dice *dice, unsigned int rate) { __be32 reg, nominal; + u32 data; + int i; int err;
err = snd_dice_transaction_read_global(dice, GLOBAL_CLOCK_SELECT, ®, sizeof(reg)); if (err < 0) return err; + data = be32_to_cpu(reg); + + data &= ~CLOCK_RATE_MASK; + for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) { + if (snd_dice_rates[i] == rate) + break; + } + if (i == ARRAY_SIZE(snd_dice_rates)) + return -EINVAL; + data |= i << CLOCK_RATE_SHIFT;
if (completion_done(&dice->clock_accepted)) reinit_completion(&dice->clock_accepted);
+ reg = cpu_to_be32(data); err = snd_dice_transaction_write_global(dice, GLOBAL_CLOCK_SELECT, ®, sizeof(reg)); if (err < 0) @@ -210,6 +223,7 @@ static int start_streams(struct snd_dice *dice, enum amdtp_stream_direction dir, unsigned int rate, struct reg_params *params) { __be32 reg[2]; + unsigned int mode; unsigned int i, pcm_chs, midi_ports; struct amdtp_stream *streams; struct fw_iso_resources *resources; @@ -224,12 +238,23 @@ static int start_streams(struct snd_dice *dice, enum amdtp_stream_direction dir, resources = dice->rx_resources; }
+ err = snd_dice_stream_get_rate_mode(dice, rate, &mode); + if (err < 0) + return err; + for (i = 0; i < params->count; i++) { + unsigned int pcm_cache; + unsigned int midi_cache; + if (dir == AMDTP_IN_STREAM) { + pcm_cache = dice->tx_channels[i][mode]; + midi_cache = dice->tx_midi_ports[i]; err = snd_dice_transaction_read_tx(dice, params->size * i + TX_NUMBER_AUDIO, reg, sizeof(reg)); } else { + pcm_cache = dice->rx_channels[i][mode]; + midi_cache = dice->rx_midi_ports[i]; err = snd_dice_transaction_read_rx(dice, params->size * i + RX_NUMBER_AUDIO, reg, sizeof(reg)); @@ -239,6 +264,14 @@ static int start_streams(struct snd_dice *dice, enum amdtp_stream_direction dir, pcm_chs = be32_to_cpu(reg[0]); midi_ports = be32_to_cpu(reg[1]);
+ /* These are important for developer of this driver. */ + if (pcm_chs != pcm_cache || midi_ports != midi_cache) { + dev_info(&dice->unit->device, + "cache mismatch: pcm: %u:%u, midi: %u:%u\n", + pcm_chs, pcm_cache, midi_ports, midi_cache); + return -EPROTO; + } + err = keep_resources(dice, dir, i, rate, pcm_chs, midi_ports); if (err < 0) return err; @@ -300,10 +333,9 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate) "fail to get sampling rate\n"); return err; } - if (rate == 0) + + if (rate != 0) rate = curr_rate; - if (rate != curr_rate) - return -EINVAL;
/* Judge to need to restart streams. */ for (i = 0; i < MAX_STREAMS; i++) { @@ -318,7 +350,7 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate) break; } } - need_to_start = (i < MAX_STREAMS); + need_to_start = (rate != curr_rate || i < MAX_STREAMS);
if (need_to_start) { /* Stop transmission. */ @@ -327,7 +359,7 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate) stop_streams(dice, AMDTP_OUT_STREAM, &rx_params); release_resources(dice);
- err = ensure_phase_lock(dice); + err = ensure_phase_lock(dice, rate); if (err < 0) { dev_err(&dice->unit->device, "fail to ensure phase lock\n");