Re: [PATCH v1 1/2] dt-bindings: net: bluetooth: ti: Add property for enhanced SCO setup erratum

[Stefano Radaelli <stefano.radaelli21@gmail.com>]

On Mon, Feb 23, 2026 at 01:03:27PM +0100, Krzysztof Kozlowski wrote:
> On 23/02/2026 12:52, Stefano Radaelli wrote:
> > From: Stefano Radaelli <stefano.r@variscite.com>
> > 
> > Some Bluetooth controller/firmware combinations advertise support for the
> 
> Which ones?
> 
> 
> This looks a lot like controller issue, thus deducible from the
> compatible. And even if particular firmware has problem, how do you see
> changing static DTS on linux-firmware update?
> 
> Best regards,
> Krzysztof

Hi Krzysztof,

thank you for your review!

We have observed this behaviour specifically on TI WL1831 modules.

When using the HCI Enhanced Setup Synchronous Connection command,
SCO setup fails even though the controller reports the command as
supported. The only working path for this controller is to fall back
to the legacy HCI Setup Synchronous Connection (0x0028).
The behaviour matches the scenario described in commit 05abad857277,
which introduced HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN for that
reason.

We are using the latest firmware available from TI for the wl18xx
family (from the official TI repository), so this is not related to
an outdated firmware version.

The reason for proposing a DT property was to keep the workaround
flexible and avoid forcing the quirk on all TI controllers handled
by hci_ll without confirmation.

However, since this may be considered deducible from the compatible,
would you prefer enabling
HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN automatically for
"ti,wl1831-st" instead of using a DT property?

Thanks for the feedback.

Best regards,
Stefano