linux-kernel - Re: [PATCH 03/14] Bluetooth: qca: fix ROM version reading on WCN3998 chips

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Message-ID: <dd020ebb-d005-4322-9321-b09199156a9c@oss.qualcomm.com>
Date: Wed, 31 Dec 2025 13:04:56 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bartosz Golaszewski <brgl@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Jeff Johnson <jjohnson@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Balakrishna Godavarthi <quic_bgodavar@...cinc.com>,
        Matthias Kaehlcke <mka@...omium.org>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-wireless@...r.kernel.org, ath10k@...ts.infradead.org,
        linux-pm@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH 03/14] Bluetooth: qca: fix ROM version reading on WCN3998
 chips

On 12/31/25 12:35 AM, Dmitry Baryshkov wrote:
> WCN3998 uses a bit different format for rom version:
> 
> [    5.479978] Bluetooth: hci0: setting up wcn399x
> [    5.633763] Bluetooth: hci0: QCA Product ID   :0x0000000a
> [    5.645350] Bluetooth: hci0: QCA SOC Version  :0x40010224
> [    5.650906] Bluetooth: hci0: QCA ROM Version  :0x00001001
> [    5.665173] Bluetooth: hci0: QCA Patch Version:0x00006699
> [    5.679356] Bluetooth: hci0: QCA controller version 0x02241001
> [    5.691109] Bluetooth: hci0: QCA Downloading qca/crbtfw21.tlv
> [    6.680102] Bluetooth: hci0: QCA Downloading qca/crnv21.bin
> [    6.842948] Bluetooth: hci0: QCA setup on UART is completed
> 
> Fixes: 523760b7ff88 ("Bluetooth: hci_qca: Added support for WCN3998")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
>  drivers/bluetooth/btqca.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
> index 7c958d6065be..86a48d009d1b 100644
> --- a/drivers/bluetooth/btqca.c
> +++ b/drivers/bluetooth/btqca.c
> @@ -804,6 +804,8 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>  	 */
>  	if (soc_type == QCA_WCN3988)
>  		rom_ver = ((soc_ver & 0x00000f00) >> 0x05) | (soc_ver & 0x0000000f);
> +	else if (soc_type == QCA_WCN3998)
> +		rom_ver = ((soc_ver & 0x0000f000) >> 0x07) | (soc_ver & 0x0000000f);
>  	else
>  		rom_ver = ((soc_ver & 0x00000f00) >> 0x04) | (soc_ver & 0x0000000f);

This looks like rom_ver is essentially maj|min or so with min = 4lsb and
maj being a couple bits up.. no big deal in the end, but this could be
expressed more nicely

Konrad