linux-kernel - Re: [PATCH v3 1/1] Bluetooth: btqca: Add WCN6855 firmware priority selection feature

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Message-ID: <mtp3qxngbnlpzk2cdp45ndtecab2h56ocwm6cp5ia7butra55a@bevidj6vdwzj>
Date: Wed, 19 Nov 2025 09:59:05 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Shuai Zhang <shuai.zhang@....qualcomm.com>
Cc: Bartosz Golaszewski <brgl@...ev.pl>, Marcel Holtmann <marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org, cheng.jiang@....qualcomm.com,
        quic_chezhou@...cinc.com, wei.deng@....qualcomm.com
Subject: Re: [PATCH v3 1/1] Bluetooth: btqca: Add WCN6855 firmware priority
 selection feature

On Mon, Nov 17, 2025 at 10:16:45AM +0800, Shuai Zhang wrote:
> Historically, WCN685x and QCA2066 shared the same firmware files.
> Now, changes are planned for the firmware that will make it incompatible
> with QCA2066, so a new firmware name is required for WCN685x.
> 
> Test Steps:
>  - Boot device
>  - Check the BTFW loading status via dmesg
> 
> Sanity pass and Test Log:
> QCA Downloading qca/wcnhpbftfw21.tlv
> Direct firmware load for qca/wcnhpbftfw21.tlv failed with error -2
> QCA Downloading qca/hpbftfw21.tlv
> 
> Signed-off-by: Shuai Zhang <shuai.zhang@....qualcomm.com>
> ---
>  drivers/bluetooth/btqca.c | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
> index 7c958d606..8e0004ef7 100644
> --- a/drivers/bluetooth/btqca.c
> +++ b/drivers/bluetooth/btqca.c
> @@ -847,8 +847,12 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>  				 "qca/msbtfw%02x.mbn", rom_ver);
>  			break;
>  		case QCA_WCN6855:
> +			/* Due to historical reasons, WCN685x chip has been using firmware
> +			 * without the "wcn" prefix. The mapping between the chip and its
> +			 * corresponding firmware has now been corrected.
> +			 */
>  			snprintf(config.fwname, sizeof(config.fwname),
> -				 "qca/hpbtfw%02x.tlv", rom_ver);
> +				 "qca/wcnhpbtfw%02x.tlv", rom_ver);
>  			break;
>  		case QCA_WCN7850:
>  			snprintf(config.fwname, sizeof(config.fwname),
> @@ -861,6 +865,13 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>  	}
>  
>  	err = qca_download_firmware(hdev, &config, soc_type, rom_ver);
> +
> +	if (!rampatch_name && err < 0 && soc_type == QCA_WCN6855) {
> +		snprintf(config.fwname, sizeof(config.fwname),
> +			 "qca/hpbtfw%02x.tlv", rom_ver);
> +		err = qca_download_firmware(hdev, &config, soc_type, rom_ver);
> +	}

Is there a reason for ignoring how it was done already for other cases when
we need a similar fallback? Please extend the existing code (or rewrite
it) instead of adding a similar hook at a completely different place.

> +
>  	if (err < 0) {
>  		bt_dev_err(hdev, "QCA Failed to download patch (%d)", err);
>  		return err;
> @@ -923,7 +934,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>  		case QCA_WCN6855:
>  			qca_read_fw_board_id(hdev, &boardid);
>  			qca_get_nvm_name_by_board(config.fwname, sizeof(config.fwname),
> -						  "hpnv", soc_type, ver, rom_ver, boardid);
> +						  "wcnhpnv", soc_type, ver, rom_ver, boardid);
>  			break;
>  		case QCA_WCN7850:
>  			qca_get_nvm_name_by_board(config.fwname, sizeof(config.fwname),
> @@ -936,6 +947,13 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>  	}
>  
>  	err = qca_download_firmware(hdev, &config, soc_type, rom_ver);
> +
> +	if (!firmware_name && err < 0 && soc_type == QCA_WCN6855) {
> +		qca_get_nvm_name_by_board(config.fwname, sizeof(config.fwname),
> +					  "hpnv", soc_type, ver, rom_ver, boardid);
> +		err = qca_download_firmware(hdev, &config, soc_type, rom_ver);
> +	}
> +
>  	if (err < 0) {
>  		bt_dev_err(hdev, "QCA Failed to download NVM (%d)", err);
>  		return err;
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry