@@ -6,7 +6,7 @@
*/
#include "./fireworks.h"
-#define READY_TIMEOUT_MS 100
+#define READY_TIMEOUT_MS 1000
static int init_stream(struct snd_efw *efw, struct amdtp_stream *stream)
{
@@ -29,7 +29,7 @@ static int init_stream(struct snd_efw *efw, struct amdtp_stream *stream)
if (err < 0)
return err;
- err = amdtp_am824_init(stream, efw->unit, s_dir, CIP_BLOCKING);
+ err = amdtp_am824_init(stream, efw->unit, s_dir, CIP_BLOCKING | CIP_UNAWARE_SYT);
if (err < 0) {
amdtp_stream_destroy(stream);
cmp_connection_destroy(conn);
@@ -264,6 +264,15 @@ int snd_efw_stream_start_duplex(struct snd_efw *efw)
return err;
if (!amdtp_stream_running(&efw->rx_stream)) {
+ unsigned int tx_init_skip_cycles;
+
+ // Audiofire 2/4 skip an isochronous cycle several thousands after starting
+ // packet transmission.
+ if (efw->is_fireworks3 && !efw->is_af9)
+ tx_init_skip_cycles = 6000;
+ else
+ tx_init_skip_cycles = 0;
+
err = start_stream(efw, &efw->rx_stream, rate);
if (err < 0)
goto error;
@@ -272,7 +281,10 @@ int snd_efw_stream_start_duplex(struct snd_efw *efw)
if (err < 0)
goto error;
- err = amdtp_domain_start(&efw->domain, 0, false, false);
+ // NOTE: 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(&efw->domain, tx_init_skip_cycles, true, false);
if (err < 0)
goto error;
Echo Digital Audio Corporation had US patent US7599388B2 titled as 'System and method for high-bandwidth serial bus data transfer'. In the patent, dual-banked shared memory is used to deliver data between serial bus transmission and processor in FIFO way. The patent seems to be used for Fireworks board module. The mechanism is not compliant to synchronization based on presentation time expressed in syt field of CIP header. Fireworks board module takes care of the sequence of the number of data blocks per packet and just ignores the value of syt field. This commit takes fireworks driver to performs sequence replay for media clock recovery. As long as I tested, Audiofire 2 and 4 have a quirk to skip an isochronous cycle several thousands after starting packet transmission. The sequence replay is tested with below models: * Loud Technology Mackie 400f * Echo Audio Audiofire 12 (DSP model) * Echo Audio Audiofire 12 (FPGA model) * Echo Audio Audiofire 8 (DSP model) * Echo Audio Audiofire 8 (FPGA model) * Echo Audio Audiofire Pre8 * Echo Audio Audiofire 4 * Echo Audio Audiofire 2 Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> --- sound/firewire/fireworks/fireworks_stream.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-)