From: Sven Peter sven@svenpeter.dev
[ Upstream commit 392fca352c7a95e2828d49e7500e26d0c87ca265 ]
Broadcom 4377 controllers found in Apple x86 Macs with the T2 chip claim to support extended scanning when querying supported states,
< HCI Command: LE Read Supported St.. (0x08|0x001c) plen 0
HCI Event: Command Complete (0x0e) plen 12
LE Read Supported States (0x08|0x001c) ncmd 1 Status: Success (0x00) States: 0x000003ffffffffff [...] LE Set Extended Scan Parameters (Octet 37 - Bit 5) LE Set Extended Scan Enable (Octet 37 - Bit 6) [...]
, but then fail to actually implement the extended scanning:
< HCI Command: LE Set Extended Sca.. (0x08|0x0041) plen 8 Own address type: Random (0x01) Filter policy: Accept all advertisement (0x00) PHYs: 0x01 Entry 0: LE 1M Type: Active (0x01) Interval: 11.250 msec (0x0012) Window: 11.250 msec (0x0012)
HCI Event: Command Complete (0x0e) plen 4
LE Set Extended Scan Parameters (0x08|0x0041) ncmd 1 Status: Unknown HCI Command (0x01)
Signed-off-by: Sven Peter sven@svenpeter.dev Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- include/net/bluetooth/hci.h | 10 ++++++++++ include/net/bluetooth/hci_core.h | 4 +++- 2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index 4518c63e9d17..78c55b69919d 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -274,6 +274,16 @@ enum { * during the hdev->setup vendor callback. */ HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN, + + /* + * When this quirk is set, the HCI_OP_LE_SET_EXT_SCAN_ENABLE command is + * disabled. This is required for some Broadcom controllers which + * erroneously claim to support extended scanning. + * + * This quirk can be set before hci_register_dev is called or + * during the hdev->setup vendor callback. + */ + HCI_QUIRK_BROKEN_EXT_SCAN, };
/* HCI device flags */ diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index e7862903187d..29d1254f9856 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -1681,7 +1681,9 @@ void hci_conn_del_sysfs(struct hci_conn *conn);
/* Use ext scanning if set ext scan param and ext scan enable is supported */ #define use_ext_scan(dev) (((dev)->commands[37] & 0x20) && \ - ((dev)->commands[37] & 0x40)) + ((dev)->commands[37] & 0x40) && \ + !test_bit(HCI_QUIRK_BROKEN_EXT_SCAN, &(dev)->quirks)) + /* Use ext create connection if command is supported */ #define use_ext_conn(dev) ((dev)->commands[37] & 0x80)