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Bluetooth: Controller: Fix sync_delay and latency in LE BIG Complete #85358

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merged 1 commit into from
Feb 12, 2025
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Bluetooth: Controller: Fix sync_delay and latency in LE BIG Complete #85358

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36 changes: 33 additions & 3 deletions subsys/bluetooth/controller/hci/hci.c
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Original file line number Diff line number Diff line change
Expand Up @@ -8152,8 +8152,11 @@ static void le_big_complete(struct pdu_data *pdu_data,
struct net_buf *buf)
{
struct bt_hci_evt_le_big_complete *sep;
uint32_t transport_latency_big;
struct ll_adv_iso_set *adv_iso;
uint32_t iso_interval_us;
struct lll_adv_iso *lll;
uint32_t big_sync_delay;
size_t evt_size;

adv_iso = node_rx->rx_ftr.param;
Expand All @@ -8170,9 +8173,36 @@ static void le_big_complete(struct pdu_data *pdu_data,
return;
}

/* FIXME: Fill sync delay and latency */
sys_put_le24(0, sep->sync_delay);
sys_put_le24(0, sep->latency);
/* BT Core v5.4 - Vol 6, Part B, Section 4.4.6.4:
* BIG_Sync_Delay = (Num_BIS – 1) × BIS_Spacing + (NSE – 1) × Sub_Interval + MPT.
*
* BT Core v5.4 - Vol 6, Part G, Section 3.2.1: (Framed)
* Transport_Latenct_BIG = BIG_Sync_Delay + PTO × (NSE / BN – IRC) * ISO_Interval +
* ISO_Interval + SDU_Interval
*
* BT Core v5.4 - Vol 6, Part G, Section 3.2.2: (Unframed)
* Transport_Latenct_BIG = BIG_Sync_Delay + (PTO × (NSE / BN – IRC) + 1) * ISO_Interval -
* SDU_Interval
*/
iso_interval_us = lll->iso_interval * ISO_INT_UNIT_US;
big_sync_delay = ull_iso_big_sync_delay(lll->num_bis, lll->bis_spacing, lll->nse,
lll->sub_interval, lll->phy, lll->max_pdu,
lll->enc);
sys_put_le24(big_sync_delay, sep->sync_delay);

if (lll->framing) {
/* Framed */
transport_latency_big = big_sync_delay +
lll->pto * (lll->nse / lll->bn - lll->irc) *
iso_interval_us + iso_interval_us + lll->sdu_interval;
} else {
/* Unframed */
transport_latency_big = big_sync_delay +
(lll->pto * (lll->nse / lll->bn - lll->irc) + 1) *
iso_interval_us - lll->sdu_interval;
}

sys_put_le24(transport_latency_big, sep->latency);

sep->phy = find_lsb_set(lll->phy);
sep->nse = lll->nse;
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