Re: [PATCH bluetooth] Bluetooth: qca: Fix the WCN3950 NVM baud rate offset

[Dmitry Baryshkov]

On Wed, Oct 21, 2026 at 08:51:12PM +0100, Michael McAllister wrote:
> WCN3950 uses the HCI transport tag layout that stores the UART baud rate
> at byte 1, like WCN3991. However, QCA_WCN3950 precedes QCA_WCN3991 in
> qca_btsoc_type, so qca_tlv_check_data() writes the baud rate to byte 2
> instead.
> 
> On a Motorola Moto G10 with WCN3950 and cmnv12.bin, configuring a 3 Mbps
> UART therefore leaves the NVM baud rate at its default 3.2 Mbps and
> overwrites the following byte. Firmware download completes, but the
> subsequent HCI_RESET times out and Bluetooth initialization fails.
> 
> Include WCN3950 in the byte-1 case so the NVM baud rate matches the host
> UART without altering the following transport parameter.
> 
> Fixes: d5712c511cb3 ("Bluetooth: qca: add WCN3950 support")
> Cc: stable@xxxxxxxxxxxxxxx
> Assisted-by: LLM
> Signed-off-by: Michael McAllister <me@xxxxxxxxxxxxxxxxxxxxx>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>


-- 
With best wishes
Dmitry