As long as I investigated, there's some cases about the delay for device between establishing OUTPUT_PLUG and transmitting first isoc packet. For devices which support BeBoB protocol version 1 can transmit the packet within several hundred milliseconds, while for devices which support BeBoB protocol version 3 can transmit the packet within 2 seconds.
Devices with protocol version 1: * Edirol FA-66 * Yamaha GO46 * Terratec Phase x24 FW * M-Audio FireWire AudioPhile * M-Audio FireWire Solo * M-Audio FireWire 1814 * M-Audio FireWire 410 * Focusrite Saffire Pro 26 I/O
Devices with protocol version 3: * M-Audio Profire Lightbridge * Behringer FCA610 * Phonic Firefly 202
At present ALSA bebob driver postpones starting IR context during 1.5 sec for all of supported devices. The delay is too long for devices with protocol version 1, while it's not enough for devices with protocol version 3.
This commit improves the delay for these protocols.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/bebob/bebob_stream.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c index 1b264d0d63eb..895a113635af 100644 --- a/sound/firewire/bebob/bebob_stream.c +++ b/sound/firewire/bebob/bebob_stream.c @@ -7,7 +7,7 @@
#include "./bebob.h"
-#define CALLBACK_TIMEOUT 2000 +#define CALLBACK_TIMEOUT 2500 #define FW_ISO_RESOURCE_DELAY 1000
/* @@ -639,6 +639,7 @@ int snd_bebob_stream_start_duplex(struct snd_bebob *bebob)
if (!amdtp_stream_running(&bebob->rx_stream)) { unsigned int curr_rate; + unsigned int ir_delay_cycle;
if (bebob->maudio_special_quirk) { err = bebob->spec->rate->get(bebob, &curr_rate); @@ -660,13 +661,18 @@ int snd_bebob_stream_start_duplex(struct snd_bebob *bebob)
// The device postpones start of transmission mostly for 1 sec // after receives packets firstly. For safe, IR context starts - // 1.5 sec (=12000 cycles) later. This is within 2.0 sec - // (=CALLBACK_TIMEOUT). + // 0.4 sec (=3200 cycles) later to version 1 or 2 firmware, + // 2.0 sec (=16000 cycles) for version 3 firmware. This is + // within 2.5 sec (=CALLBACK_TIMEOUT). // Furthermore, some devices transfer isoc packets with // discontinuous counter in the beginning of packet streaming. // The delay has an effect to avoid detection of this // discontinuity. - err = amdtp_domain_start(&bebob->domain, 12000); + if (bebob->version < 2) + ir_delay_cycle = 3200; + else + ir_delay_cycle = 16000; + err = amdtp_domain_start(&bebob->domain, ir_delay_cycle); if (err < 0) goto error;