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ALSA: bebob: loosen up severity of checking continuity for BeBoB v3 quirk

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PrismSound Orpheus, Behringer UFX1604 and FCA610 work with BeBoB v3, and
they're confirmed to transmit discontinuous packets in the beginning of
streaming.

payload    CIP headers
  8        0x00070000 0x9002FFFF
  8        0x00070000 0x9002FFFF
  8        0x00070000 0x9002FFFF
  8        0x00070008 0x9002FFFF <-
  8        0x00070008 0x9002FFFF
  8        0x00070008 0x9002FFFF
  8        0x00070008 0x9002FFFF
  8        0x00070008 0x9002FFFF
  8        0x00070008 0x9002FFFF
232        0x00070000 0x9002E798 <-
232        0x00070008 0x9002FB99
232        0x00070010 0x90021398
  8        0x00070018 0x9002FFFF
(This sample was got with Behringer FCA610 and FFADO library.)

This commit sets CIP_EMPTY_HAS_WRONG_DBC and CIP_SKIP_DBC_ZERO_CHECK to
ignore these discontinuities.

Tested-by: Kim Tore Jensen <kim@incendio.no>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2015-06-14 12:49:35 +09:00 committed by Takashi Iwai
parent 9a73195e61
commit c4d860a0d2
1 changed files with 11 additions and 0 deletions
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11
sound/firewire/bebob/bebob_stream.c
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@ -540,6 +540,17 @@ int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
/* See comments in next function */
init_completion(&bebob->bus_reset);
bebob->tx_stream.flags |= CIP_SKIP_INIT_DBC_CHECK;
/*
* BeBoB v3 transfers packets with these qurks:
* - In the beginning of streaming, the value of dbc is incremented
* even if no data blocks are transferred.
* - The value of dbc is reset suddenly.
*/
if (bebob->version > 2)
bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC |
CIP_SKIP_DBC_ZERO_CHECK;
/*
* At high sampling rate, M-Audio special firmware transmits empty
* packet with the value of dbc incremented by 8 but the others are