[PATCH v1 0/2] Bluetooth: hci_ll: Add DT control for enhanced SCO setup erratum

[Stefano Radaelli]

While validating SCO audio on a platform using TI WL183x Bluetooth
modules with the hci_ll driver, we observed failures when the
HCI Enhanced Setup Synchronous Connection command was used.

Although the controller advertises support for the command, SCO setup
fails in certain configurations (e.g. BT_VOICE_TRANSPARENT/mSBC).
This matches the scenario described in commit 05abad857277
("Bluetooth: HCI: Add HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN quirk").

Initially, we considered setting the
HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN quirk unconditionally in
hci_ll. However, this would affect all TI controllers handled by the
driver, including configurations where the enhanced setup command
works correctly.

To avoid hardcoding the quirk globally, this series introduces an
optional DT property that describes the controller limitation and
allows enabling the quirk on affected boards only.

Patch 1 updates the TI Bluetooth DT binding.
Patch 2 adds support for the property in hci_ll and sets the quirk
during controller setup when requested.

Tested on VAR-SOM-MX6 using TI WL183x modules where SCO audio was
previously failing.

Comments welcome.

Stefano Radaelli (2):
  dt-bindings: net: bluetooth: ti: Add property for enhanced SCO setup
    erratum
  Bluetooth: hci_ll: Add DT property to disable enhanced SCO setup

 .../devicetree/bindings/net/bluetooth/ti,bluetooth.yaml  | 7 +++++++
 drivers/bluetooth/hci_ll.c                               | 9 +++++++++
 2 files changed, 16 insertions(+)


base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
-- 
2.47.3