diff options
| -rw-r--r-- | sound/firewire/tascam/tascam-stream.c | 21 | ||||
| -rw-r--r-- | sound/firewire/tascam/tascam.h | 1 |
2 files changed, 20 insertions, 2 deletions
diff --git a/sound/firewire/tascam/tascam-stream.c b/sound/firewire/tascam/tascam-stream.c index 4811b60e5823..53e094cc411f 100644 --- a/sound/firewire/tascam/tascam-stream.c +++ b/sound/firewire/tascam/tascam-stream.c @@ -11,7 +11,7 @@ #define CLOCK_STATUS_MASK 0xffff0000 #define CLOCK_CONFIG_MASK 0x0000ffff -#define READY_TIMEOUT_MS 500 +#define READY_TIMEOUT_MS 4000 static int get_clock(struct snd_tscm *tscm, u32 *data) { @@ -423,6 +423,8 @@ int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate, fw_iso_resources_free(&tscm->rx_resources); return err; } + + tscm->need_long_tx_init_skip = (rate != curr_rate); } return 0; @@ -454,6 +456,7 @@ int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate) if (!amdtp_stream_running(&tscm->rx_stream)) { int spd = fw_parent_device(tscm->unit)->max_speed; + unsigned int tx_init_skip_cycles; err = set_stream_formats(tscm, rate); if (err < 0) @@ -473,7 +476,19 @@ int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate) if (err < 0) goto error; - err = amdtp_domain_start(&tscm->domain, 0, false, false); + if (tscm->need_long_tx_init_skip) + tx_init_skip_cycles = 16000; + else + tx_init_skip_cycles = 0; + + // MEMO: Just after starting packet streaming, it transfers packets without any + // event. Enough after receiving the sequence of packets, it multiplexes events into + // the packet. However, just after changing sampling transfer frequency, it stops + // multiplexing during packet transmission. Enough after, it restarts multiplexing + // again. The device ignores presentation time expressed by the value of syt field + // of CIP header in received packets. The sequence of the number of data blocks per + // packet is important for media clock recovery. + err = amdtp_domain_start(&tscm->domain, tx_init_skip_cycles, true, true); if (err < 0) return err; @@ -499,6 +514,8 @@ void snd_tscm_stream_stop_duplex(struct snd_tscm *tscm) fw_iso_resources_free(&tscm->tx_resources); fw_iso_resources_free(&tscm->rx_resources); + + tscm->need_long_tx_init_skip = false; } } diff --git a/sound/firewire/tascam/tascam.h b/sound/firewire/tascam/tascam.h index 78b7a08986a1..28dad4eae9c9 100644 --- a/sound/firewire/tascam/tascam.h +++ b/sound/firewire/tascam/tascam.h @@ -99,6 +99,7 @@ struct snd_tscm { unsigned int push_pos; struct amdtp_domain domain; + bool need_long_tx_init_skip; }; #define TSCM_ADDR_BASE 0xffff00000000ull |