CHROMIUM: Bluetooth: hci_sync: Disable filter dup when adv monitoring

SW based filtering requires all advertisement reports to perform RSSI
based filtering. So, disable filter duplicates while scanning for
advertisement monitoring.

Fixes: 9ca7b6b1cc20 ("Bluetooth: hci_sync: Make use of hci_cmd_sync_queue set 3")

Note: This will be upstream'd later. Submitting as a CHROMIUM patch to get this merged into M104 on time.
Signed-off-by: Manish Mandlik <[email protected]>

BUG=b:234869005
TEST=Run AdvMonitor tests on dedede with RTL

Signed-off-by: Zhengping Jiang <[email protected]>

Author: liveusr

net/bluetooth/hci_sync.c

@@ -2665,6 +2665,20 @@ static int hci_passive_scan_sync(struct hci_dev *hdev)
 	} else if (hci_is_adv_monitoring(hdev)) {
 		window = hdev->le_scan_window_adv_monitor;
 		interval = hdev->le_scan_int_adv_monitor;
+
+		/* Disable duplicates filter when scanning for advertisement
+		 * monitor for the following reasons.
+		 *
+		 * For HW pattern filtering (ex. MSFT), Realtek and Qualcomm
+		 * controllers ignore RSSI_Sampling_Period when the duplicates
+		 * filter is enabled.
+		 *
+		 * For SW pattern filtering, when we're not doing interleaved
+		 * scanning, it is necessary to disable duplicates filter,
+		 * otherwise hosts can only receive one advertisement and it's
+		 * impossible to know if a peer is still in range.
+		 */
+		filter_dups = LE_SCAN_FILTER_DUP_DISABLE;
 	} else {
 		window = hdev->le_scan_window;
 		interval = hdev->le_scan_interval;