Bluetooth: Controller: Move aux sync scanning to lll_sync

Periodic advertising train scanner implemented in lll_scan_aux adds lots
of branches that cannot be compiled out with periodic advertising sync
disabled.

This commit moves sync parts of the code from lll_scan_aux to lll_sync.

Signed-off-by: Andrzej Kaczmarek <[email protected]>

Author: andrzej-kaczmarek

subsys/bluetooth/controller/ll_sw/lll_scan_aux.h

@@ -9,3 +9,5 @@ int lll_scan_aux_reset(void);
 void lll_scan_aux_prepare(void *param);
 
 extern uint8_t ull_scan_aux_lll_handle_get(struct lll_scan_aux *lll);
+extern void *ull_scan_aux_lll_parent_get(struct lll_scan_aux *lll,
+					 uint8_t *is_lll_scan);

subsys/bluetooth/controller/ll_sw/lll_sync.h

@@ -29,7 +29,7 @@ struct lll_sync {
 	uint32_t window_widening_event_us;
 	uint32_t window_size_event_us;
 
-	/* temporary storage when aux scan was scheduled from LLL */
+	/* used to store lll_aux when chain is being scanned */
 	struct lll_scan_aux *lll_aux;
 
 	uint8_t phy:3;

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_scan.c

@@ -1455,10 +1455,12 @@ static int isr_rx_scan_report(struct lll_scan *lll, uint8_t rssi_ready,
 								 phy_flags_rx);
 				ftr->phy_flags = phy_flags_rx;
 				ftr->aux_lll_sched =
-					lll_scan_aux_setup(lll, NULL, pdu_adv_rx,
-							   lll->phy,
-							   phy_flags_rx);
+					lll_scan_aux_setup(pdu_adv_rx, lll->phy,
+							   phy_flags_rx,
+							   lll_scan_aux_isr_aux_setup,
+							   lll);
 				if (ftr->aux_lll_sched) {
+					lll->is_aux_sched = 1U;
 					err = -EBUSY;
 				}
 			}