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Bluetooth: Add quirk to ignore reserved PHY bits in LE Extended Adv Report

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Some Broadcom controllers found on Apple Silicon machines abuse the
reserved bits inside the PHY fields of LE Extended Advertising Report
events for additional flags. Add a quirk to drop these and correctly
extract the Primary/Secondary_PHY field.

The following excerpt from a btmon trace shows a report received with
"Reserved" for "Primary PHY" on a 4388 controller:

> HCI Event: LE Meta Event (0x3e) plen 26
      LE Extended Advertising Report (0x0d)
        Num reports: 1
        Entry 0
          Event type: 0x2515
            Props: 0x0015
              Connectable
              Directed
              Use legacy advertising PDUs
            Data status: Complete
            Reserved (0x2500)
         Legacy PDU Type: Reserved (0x2515)
          Address type: Random (0x01)
          Address: 00:00:00:00:00:00 (Static)
          Primary PHY: Reserved
          Secondary PHY: No packets
          SID: no ADI field (0xff)
          TX power: 127 dBm
          RSSI: -60 dBm (0xc4)
          Periodic advertising interval: 0.00 msec (0x0000)
          Direct address type: Public (0x00)
          Direct address: 00:00:00:00:00:00 (Apple, Inc.)
          Data length: 0x00

Cc: stable@vger.kernel.org
Fixes: 2e7ed5f5e6 ("Bluetooth: hci_sync: Use advertised PHYs on hci_le_ext_create_conn_sync")
Reported-by: Janne Grunau <j@jannau.net>
Closes: https://lore.kernel.org/all/Zjz0atzRhFykROM9@robin
Tested-by: Janne Grunau <j@jannau.net>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Sven Peter 2024-05-15 18:02:58 +00:00 committed by Luiz Augusto von Dentz
parent dc6be0b73f
commit ed2a2ef16a
3 changed files with 26 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/bluetooth/hci_bcm4377.c
View File

@ -495,6 +495,10 @@ struct bcm4377_data;
* extended scanning
* broken_mws_transport_config: Set to true if the chip erroneously claims to
* support MWS Transport Configuration
* broken_le_ext_adv_report_phy: Set to true if this chip stuffs flags inside
* reserved bits of Primary/Secondary_PHY inside
* LE Extended Advertising Report events which
* have to be ignored
* send_calibration: Optional callback to send calibration data
* send_ptb: Callback to send "PTB" regulatory/calibration data
*/
@ -513,6 +517,7 @@ struct bcm4377_hw {
unsigned long broken_ext_scan : 1;
unsigned long broken_mws_transport_config : 1;
unsigned long broken_le_coded : 1;
unsigned long broken_le_ext_adv_report_phy : 1;
int (*send_calibration)(struct bcm4377_data *bcm4377);
int (*send_ptb)(struct bcm4377_data *bcm4377,
@ -2373,6 +2378,8 @@ static int bcm4377_probe(struct pci_dev *pdev, const struct pci_device_id *id)
set_bit(HCI_QUIRK_BROKEN_EXT_SCAN, &hdev->quirks);
if (bcm4377->hw->broken_le_coded)
set_bit(HCI_QUIRK_BROKEN_LE_CODED, &hdev->quirks);
if (bcm4377->hw->broken_le_ext_adv_report_phy)
set_bit(HCI_QUIRK_FIXUP_LE_EXT_ADV_REPORT_PHY, &hdev->quirks);
pci_set_drvdata(pdev, bcm4377);
hci_set_drvdata(hdev, bcm4377);
@ -2477,6 +2484,7 @@ static const struct bcm4377_hw bcm4377_hw_variants[] = {
.clear_pciecfg_subsystem_ctrl_bit19 = true,
.broken_mws_transport_config = true,
.broken_le_coded = true,
.broken_le_ext_adv_report_phy = true,
.send_calibration = bcm4387_send_calibration,
.send_ptb = bcm4378_send_ptb,
},

11
include/net/bluetooth/hci.h
View File

@ -324,6 +324,17 @@ enum {
* claim to support it.
*/
HCI_QUIRK_BROKEN_READ_ENC_KEY_SIZE,
/*
* When this quirk is set, the reserved bits of Primary/Secondary_PHY
* inside the LE Extended Advertising Report events are discarded.
* This is required for some Apple/Broadcom controllers which
* abuse these reserved bits for unrelated flags.
*
* This quirk can be set before hci_register_dev is called or
* during the hdev->setup vendor callback.
*/
HCI_QUIRK_FIXUP_LE_EXT_ADV_REPORT_PHY,
};
/* HCI device flags */

7
net/bluetooth/hci_event.c
View File

@ -6311,6 +6311,13 @@ static void hci_le_ext_adv_report_evt(struct hci_dev *hdev, void *data,
evt_type = __le16_to_cpu(info->type) & LE_EXT_ADV_EVT_TYPE_MASK;
legacy_evt_type = ext_evt_type_to_legacy(hdev, evt_type);
if (test_bit(HCI_QUIRK_FIXUP_LE_EXT_ADV_REPORT_PHY,
&hdev->quirks)) {
info->primary_phy &= 0x1f;
info->secondary_phy &= 0x1f;
}
if (legacy_evt_type != LE_ADV_INVALID) {
process_adv_report(hdev, legacy_evt_type, &info->bdaddr,
info->bdaddr_type, NULL, 0,