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Bluetooth: Controller: Workaround sequence number misalignment

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Workaround sequence number misalignment to ISO event count
when ISO data is supplied in bursts, example through USB.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2023-01-27 11:01:52 +05:30 • committed by Stephanos Ioannidis
commit 595860567b
1 changed files with 32 additions and 1 deletions
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33
subsys/bluetooth/controller/hci/hci.c
View file

@ -5738,6 +5738,22 @@ int hci_iso_handle(struct net_buf *buf, struct net_buf **evt)
sdu_frag_tx.target_event = cis->lll.event_count +
((cis->lll.tx.ft > 1U) ? 0U : 1U);
/* FIXME: Remove the below temporary hack to buffer up ISO data
* if the SDU interval and ISO interval misalign.
*/
uint64_t pkt_seq_num = cis->lll.event_count + 1U;
if (((pkt_seq_num - cis->lll.tx.payload_count) &
BIT64_MASK(39)) <= BIT64_MASK(38)) {
cis->lll.tx.payload_count = pkt_seq_num;
} else {
pkt_seq_num = cis->lll.tx.payload_count;
}
sdu_frag_tx.target_event = pkt_seq_num;
cis->lll.tx.payload_count++;
sdu_frag_tx.grp_ref_point = cig->cig_ref_point;
/* Get controller's input data path for CIS */
@ -5809,7 +5825,22 @@ int hci_iso_handle(struct net_buf *buf, struct net_buf **evt)
* than LL bisPayloadCounter or no data is sent.
*/
lll_iso = &adv_iso->lll;
sdu_frag_tx.target_event = (lll_iso->payload_count / lll_iso->bn);
/* FIXME: Remove the below temporary hack to buffer up ISO data
* if the SDU interval and ISO interval misalign.
*/
uint64_t pkt_seq_num = lll_iso->payload_count / lll_iso->bn;
if (((pkt_seq_num - stream->pkt_seq_num) & BIT64_MASK(39)) <=
BIT64_MASK(38)) {
stream->pkt_seq_num = pkt_seq_num;
} else {
pkt_seq_num = stream->pkt_seq_num;
}
sdu_frag_tx.target_event = pkt_seq_num;
stream->pkt_seq_num++;
/* Start Fragmentation */
/* FIXME: need to ensure ISO-AL returns proper isoal_status.