[PATCH 0/4] Bluetooth: Broadcom controllers of the Apple T2 Macs

[Andre Eikmeyer <dev@deq.rocks>]

Hello everyone,

This series is for the Broadcom Bluetooth controllers of the Apple T2
Macs, the BCM4364 over UART (hci_bcm) and the BCM4377 over PCIe
(hci_bcm4377).

  1    raise ACL priority on Apple Broadcom controllers
  2    clear vendor bits in LE advertising report types
  3    Revert "Bluetooth: hci_event: strip Broadcom vendor bits from
       legacy adv report type"
  4    set the strict duplicate filter quirk on Apple Broadcom controllers

Patch 2 and 3 belong together. Commit 88397423671f ("Bluetooth:
hci_event: strip Broadcom vendor bits from legacy adv report type") in
bluetooth-next masks the event type of legacy LE Advertising Reports for
every controller with manufacturer 15. The controllers known to set these
bits are the ones of the T2 Macs. Aditya Garg asked about this on the
list:

  https://lore.kernel.org/linux-bluetooth/F4853998-F2A8-4AFE-99EA-544657EAB0E8@linux.dev/

Masking the type to its low nibble goes back to a t2linux patch by Jose
Miguel Ochoa. Patch 2 clears the bits in the two drivers of these
controllers before the event reaches the core, and patch 3 reverts the
check in hci_event.c. Patch 2 comes first, so every commit in between
keeps the reports.

Patch 1 builds on a vendor command the Android Broadcom vendor library
uses, 0xfc57, to keep A2DP from dropping out while WLAN runs on 2.4 GHz.
Patch 4 sets the strict duplicate filter quirk in both drivers, so a
discovery reports changed advertisement data before its next cycle.

The KaiT2en community, about 280 members, runs these patches with its
kernels. Users reported them working on the MacBookPro15,1, 15,2, 15,3,
15,4, 16,1, 16,4, MacBookAir9,1 and iMac20,1, and nobody reported a
regression.

Andre Eikmeyer (4):
  Bluetooth: btbcm: raise ACL priority on Apple Broadcom controllers
  Bluetooth: btbcm: clear vendor bits in LE advertising report types
  Revert "Bluetooth: hci_event: strip Broadcom vendor bits from legacy
    adv report type"
  Bluetooth: set the strict duplicate filter quirk on Apple Broadcom
    controllers

 drivers/bluetooth/Kconfig       |   1 +
 drivers/bluetooth/btbcm.c       | 102 ++++++++++++++++++++++++++++++++
 drivers/bluetooth/btbcm.h       |  12 ++++
 drivers/bluetooth/hci_bcm.c     |  28 ++++++++-
 drivers/bluetooth/hci_bcm4377.c |   9 +++
 net/bluetooth/hci_event.c       |  11 ----
 6 files changed, 149 insertions(+), 14 deletions(-)


base-commit: 3f425f95ba3923d605f6a8b382e8fcdc59d479db