ALSA: fireworks/firewire-lib: Add a quirk to reset data block counter at bus reset
Fireworks has a quirk to reset data block counter at bus reset. This commit adds a flag of CIP_SKIP_DBC_ZERO_CHECK. This flag has an effect to skip checking dbc continuity when dbc is zero. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -662,7 +662,9 @@ static void handle_in_packet(struct amdtp_stream *s,
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/* Check data block counter continuity */
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data_block_counter = cip_header[0] & AMDTP_DBC_MASK;
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if (!(s->flags & CIP_DBC_IS_END_EVENT)) {
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if ((s->flags & CIP_SKIP_DBC_ZERO_CHECK) && data_block_counter == 0) {
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lost = false;
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} else if (!(s->flags & CIP_DBC_IS_END_EVENT)) {
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lost = data_block_counter != s->data_block_counter;
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} else {
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if ((data_blocks > 0) && (s->tx_dbc_interval > 0))
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@ -23,6 +23,8 @@
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* corresponds to the end of event in the packet. Out of IEC 61883.
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* @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets.
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* The value of data_block_quadlets is used instead of reported value.
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* @SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is
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* skipped for detecting discontinuity.
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*/
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enum cip_flags {
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CIP_NONBLOCKING = 0x00,
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@ -31,6 +33,7 @@ enum cip_flags {
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CIP_EMPTY_WITH_TAG0 = 0x04,
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CIP_DBC_IS_END_EVENT = 0x08,
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CIP_WRONG_DBS = 0x10,
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CIP_SKIP_DBC_ZERO_CHECK = 0x20,
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};
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/**
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@ -198,6 +198,8 @@ int snd_efw_stream_init_duplex(struct snd_efw *efw)
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efw->tx_stream.flags |= CIP_EMPTY_WITH_TAG0;
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/* Fireworks has its own meaning for dbc. */
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efw->tx_stream.flags |= CIP_DBC_IS_END_EVENT;
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/* Fireworks reset dbc at bus reset. */
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efw->tx_stream.flags |= CIP_SKIP_DBC_ZERO_CHECK;
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/* AudioFire9 always reports wrong dbs. */
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if (efw->is_af9)
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efw->tx_stream.flags |= CIP_WRONG_DBS;
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