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ALSA: firewire-lib: add a quirk of packet without valid EOH in CIP format
In IEC 61883-1, when two quadlets CIP header is used, the most significant bit in second CIP header stands. However, packets from units with MOTU protocol version 3 have a quirk without this flag. Current packet streaming layer handles this as protocol error. This commit adds a new enumeration constant for this quirk, to handle MOTU protocol version 3. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -480,8 +480,9 @@ static int handle_in_packet(struct amdtp_stream *s,
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* This module supports 'Two-quadlet CIP header with SYT field'.
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* For convenience, also check FMT field is AM824 or not.
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*/
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if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) ||
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((cip_header[1] & CIP_EOH_MASK) != CIP_EOH)) {
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if ((((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) ||
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((cip_header[1] & CIP_EOH_MASK) != CIP_EOH)) &&
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(!(s->flags & CIP_HEADER_WITHOUT_EOH))) {
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dev_info_ratelimited(&s->unit->device,
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"Invalid CIP header for AMDTP: %08X:%08X\n",
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cip_header[0], cip_header[1]);
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@ -29,6 +29,8 @@
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* @CIP_JUMBO_PAYLOAD: Only for in-stream. The number of data blocks in an
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* packet is larger than IEC 61883-6 defines. Current implementation
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* allows 5 times as large as IEC 61883-6 defines.
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* @CIP_HEADER_WITHOUT_EOH: Only for in-stream. CIP Header doesn't include
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* valid EOH.
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*/
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enum cip_flags {
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CIP_NONBLOCKING = 0x00,
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@ -39,6 +41,7 @@ enum cip_flags {
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CIP_SKIP_DBC_ZERO_CHECK = 0x10,
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CIP_EMPTY_HAS_WRONG_DBC = 0x20,
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CIP_JUMBO_PAYLOAD = 0x40,
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CIP_HEADER_WITHOUT_EOH = 0x80,
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};
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/**
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