[PATCH 4/4] Bluetooth: set the strict duplicate filter quirk on Apple Broadcom controllers

[Andre Eikmeyer <dev@deq.rocks>]

btbcm_finalize() sets HCI_QUIRK_STRICT_DUPLICATE_FILTER, but bcm_setup()
returns before it when no patch file was loaded. The MacBookPro15,1 has
none for its BCM4364B0 ("BCM: firmware Patch file not found").
hci_bcm4377 does not use btbcm_finalize() and never sets the quirk. A
service discovery then scans with "Filter duplicates: Enabled", and the
controller reports an address once per discovery cycle of about 10.7 s.
A Mac that changed its advertisement data on the same address was
reported 6 s after the change, at the next cycle.

Set the quirk in hci_bcm on that path and in hci_bcm4377.

Tested-by: Yossef Osman <Yossef.Osman@proton.me>
Tested-by: Aditya Garg <aditya.garg@linux.dev>
Signed-off-by: Andre Eikmeyer <dev@deq.rocks>
---
 drivers/bluetooth/hci_bcm.c     | 5 ++++-
 drivers/bluetooth/hci_bcm4377.c | 5 +++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 1ae9619ee1e..ee077c8502d 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -597,8 +597,11 @@ static int bcm_setup(struct hci_uart *hu)
 	if (err)
 		return err;
 
-	if (!fw_load_done)
+	if (!fw_load_done) {
+		/* btbcm_finalize() sets this after loading a patch file */
+		hci_set_quirk(hu->hdev, HCI_QUIRK_STRICT_DUPLICATE_FILTER);
 		return 0;
+	}
 
 	/* Init speed if any */
 	if (bcm->dev && bcm->dev->init_speed)
diff --git a/drivers/bluetooth/hci_bcm4377.c b/drivers/bluetooth/hci_bcm4377.c
index 8d99a7a8f76..7105372898d 100644
--- a/drivers/bluetooth/hci_bcm4377.c
+++ b/drivers/bluetooth/hci_bcm4377.c
@@ -2392,6 +2392,11 @@ static int bcm4377_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	hdev->set_bdaddr = bcm4377_hci_set_bdaddr;
 	hdev->setup = bcm4377_hci_setup;
 
+	/* The controller reports an address once per scan with duplicate
+	 * filtering, also after its advertisement data changed.
+	 */
+	hci_set_quirk(hdev, HCI_QUIRK_STRICT_DUPLICATE_FILTER);
+
 	if (bcm4377->hw->broken_mws_transport_config)
 		hci_set_quirk(hdev, HCI_QUIRK_BROKEN_MWS_TRANSPORT_CONFIG);
 	if (bcm4377->hw->broken_ext_scan)