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Bluetooth: controller: Reduce ISO peripheral CIS establishement delay

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New LLCP will process the CIS establishement in the TX path, meaning it
will only process once every ACL connection interval.
If ACL connection interval is significantly longer than the ISO
interval, CIS packets corresponding to the ACL connection interval will
be lost. This may cause latency in audio rendition.

By processing the CIS establishment in the RX path, notification will be
sent immediately, and audio path is enabled fast to reduce latency.

When a CIS fails to establish, the controller shall complete the
procedure by sending a CIS_ESTABLISHED event containing the error.

Signed-off-by: Morten Priess <mtpr@oticon.com>
This commit is contained in:
Morten Priess 2022-12-06 13:08:12 +01:00 • committed by Fabio Baltieri
commit 60b1f2b36b
6 changed files with 144 additions and 17 deletions
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35
subsys/bluetooth/controller/ll_sw/ull_llcp_cc.c
View file

@ -127,6 +127,9 @@ enum {
/* Reject response received */
RP_CC_EVT_REJECT,
/* Established */
RP_CC_EVT_CIS_ESTABLISHED,
/* Unknown response received */
RP_CC_EVT_UNKNOWN,
};
@ -433,7 +436,6 @@ static void rp_cc_state_wait_ntf_cis_create(struct ll_conn *conn, struct proc_ct
}
}
static void rp_cc_state_wait_ntf(struct ll_conn *conn, struct proc_ctx *ctx, uint8_t evt,
void *param)
{
@ -535,6 +537,10 @@ static void rp_cc_state_wait_cis_established(struct ll_conn *conn, struct proc_c
rp_cc_complete(conn, ctx, evt, param);
}
break;
case RP_CC_EVT_CIS_ESTABLISHED:
/* CIS was established, so let's go ahead and complete procedure */
rp_cc_complete(conn, ctx, evt, param);
break;
default:
/* Ignore other evts */
break;
@ -623,6 +629,11 @@ bool llcp_rp_cc_awaiting_reply(struct proc_ctx *ctx)
return (ctx->state == RP_CC_STATE_WAIT_REPLY);
}
bool llcp_rp_cc_awaiting_established(struct proc_ctx *ctx)
{
return (ctx->state == RP_CC_STATE_WAIT_CIS_ESTABLISHED);
}
void llcp_rp_cc_accept(struct ll_conn *conn, struct proc_ctx *ctx)
{
rp_cc_execute_fsm(conn, ctx, RP_CC_EVT_CIS_REQ_ACCEPT, NULL);
@ -642,6 +653,11 @@ bool llcp_rp_cc_awaiting_instant(struct proc_ctx *ctx)
{
return (ctx->state == RP_CC_STATE_WAIT_INSTANT);
}
void llcp_rp_cc_established(struct ll_conn *conn, struct proc_ctx *ctx)
{
rp_cc_execute_fsm(conn, ctx, RP_CC_EVT_CIS_ESTABLISHED, NULL);
}
#endif /* CONFIG_BT_PERIPHERAL */
#if defined(CONFIG_BT_CTLR_CENTRAL_ISO)
@ -669,6 +685,9 @@ enum {
/* Reject response received */
LP_CC_EVT_REJECT,
/* CIS established */
LP_CC_EVT_ESTABLISHED,
/* Unknown response received */
LP_CC_EVT_UNKNOWN,
};
@ -898,6 +917,10 @@ static void lp_cc_st_wait_established(struct ll_conn *conn, struct proc_ctx *ctx
lp_cc_complete(conn, ctx, evt, param);
}
break;
case LP_CC_EVT_ESTABLISHED:
/* CIS was established, so let's go ahead and complete procedure */
lp_cc_complete(conn, ctx, evt, param);
break;
default:
/* Ignore other evts */
break;
@ -956,4 +979,14 @@ bool llcp_lp_cc_is_active(struct proc_ctx *ctx)
{
return ctx->state != LP_CC_STATE_IDLE;
}
bool llcp_lp_cc_awaiting_established(struct proc_ctx *ctx)
{
return (ctx->state == LP_CC_STATE_WAIT_ESTABLISHED);
}
void llcp_lp_cc_established(struct ll_conn *conn, struct proc_ctx *ctx)
{
lp_cc_execute_fsm(conn, ctx, LP_CC_EVT_ESTABLISHED, NULL);
}
#endif /* CONFIG_BT_CTLR_CENTRAL_ISO */