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-rw-r--r--sound/firewire/amdtp-stream.c12
-rw-r--r--sound/firewire/amdtp-stream.h4
2 files changed, 12 insertions, 4 deletions
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index 7be17bca25..c9f153f85a 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -773,10 +773,14 @@ static int check_cip_header(struct amdtp_stream *s, const __be32 *buf,
} else {
unsigned int dbc_interval;
- if (*data_blocks > 0 && s->ctx_data.tx.dbc_interval > 0)
- dbc_interval = s->ctx_data.tx.dbc_interval;
- else
- dbc_interval = *data_blocks;
+ if (!(s->flags & CIP_DBC_IS_PAYLOAD_QUADLETS)) {
+ if (*data_blocks > 0 && s->ctx_data.tx.dbc_interval > 0)
+ dbc_interval = s->ctx_data.tx.dbc_interval;
+ else
+ dbc_interval = *data_blocks;
+ } else {
+ dbc_interval = payload_length / sizeof(__be32);
+ }
lost = dbc != ((*data_block_counter + dbc_interval) & 0xff);
}
diff --git a/sound/firewire/amdtp-stream.h b/sound/firewire/amdtp-stream.h
index b7ff44751a..a1ed2e80f9 100644
--- a/sound/firewire/amdtp-stream.h
+++ b/sound/firewire/amdtp-stream.h
@@ -37,6 +37,9 @@
* the value of current SYT_INTERVAL; e.g. initial value is not zero.
* @CIP_UNAWARE_SYT: For outgoing packet, the value in SYT field of CIP is 0xffff.
* For incoming packet, the value in SYT field of CIP is not handled.
+ * @CIP_DBC_IS_PAYLOAD_QUADLETS: Available for incoming packet, and only effective with
+ * CIP_DBC_IS_END_EVENT flag. The value of dbc field is the number of accumulated quadlets
+ * in CIP payload, instead of the number of accumulated data blocks.
*/
enum cip_flags {
CIP_NONBLOCKING = 0x00,
@@ -51,6 +54,7 @@ enum cip_flags {
CIP_NO_HEADER = 0x100,
CIP_UNALIGHED_DBC = 0x200,
CIP_UNAWARE_SYT = 0x400,
+ CIP_DBC_IS_PAYLOAD_QUADLETS = 0x800,
};
/**