linux-kernel - [PATCH v3 1/1] Bluetooth: btusb: add default nvm file

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Message-Id: <20251104112441.2667316-2-quic_shuaz@quicinc.com>
Date: Tue,  4 Nov 2025 19:24:41 +0800
From: Shuai Zhang <quic_shuaz@...cinc.com>
To: Marcel Holtmann <marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc: linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        quic_chejiang@...cinc.com, quic_jiaymao@...cinc.com,
        quic_chezhou@...cinc.com, Shuai Zhang <quic_shuaz@...cinc.com>
Subject: [PATCH v3 1/1] Bluetooth: btusb: add default nvm file

If no NVM file matches the board_id, load the default NVM file.

Cc: stable@...r.kernel.org
Signed-off-by: Shuai Zhang <quic_shuaz@...cinc.com>
---
 drivers/bluetooth/btusb.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index dcbff7641..020dbb0ab 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3482,15 +3482,14 @@ static int btusb_setup_qca_load_rampatch(struct hci_dev *hdev,
 }
 
 static void btusb_generate_qca_nvm_name(char *fwname, size_t max_size,
-					const struct qca_version *ver)
+					const struct qca_version *ver,
+					u16 board_id)
 {
 	u32 rom_version = le32_to_cpu(ver->rom_version);
 	const char *variant, *fw_subdir;
 	int len;
-	u16 board_id;
 
 	fw_subdir = qca_get_fw_subdirectory(ver);
-	board_id = qca_extract_board_id(ver);
 
 	switch (le32_to_cpu(ver->ram_version)) {
 	case WCN6855_2_0_RAM_VERSION_GF:
@@ -3517,14 +3516,14 @@ static void btusb_generate_qca_nvm_name(char *fwname, size_t max_size,
 
 static int btusb_setup_qca_load_nvm(struct hci_dev *hdev,
 				    struct qca_version *ver,
-				    const struct qca_device_info *info)
+				    const struct qca_device_info *info,
+				    u16 board_id)
 {
 	const struct firmware *fw;
 	char fwname[80];
 	int err;
 
-	btusb_generate_qca_nvm_name(fwname, sizeof(fwname), ver);
-
+	btusb_generate_qca_nvm_name(fwname, sizeof(fwname), ver, board_id);
 	err = request_firmware(&fw, fwname, &hdev->dev);
 	if (err) {
 		bt_dev_err(hdev, "failed to request NVM file: %s (%d)",
@@ -3606,10 +3605,19 @@ static int btusb_setup_qca(struct hci_dev *hdev)
 	btdata->qca_dump.controller_id = le32_to_cpu(ver.rom_version);
 
 	if (!(status & QCA_SYSCFG_UPDATED)) {
-		err = btusb_setup_qca_load_nvm(hdev, &ver, info);
-		if (err < 0)
-			return err;
+		u16 board_id = qca_extract_board_id(&ver);
 
+		err = btusb_setup_qca_load_nvm(hdev, &ver, info, board_id);
+		if (err < 0) {
+			//if the board id is not 0, try to load the defalut nvm file
+			if (err == -ENOENT && board_id != 0) {
+				err = btusb_setup_qca_load_nvm(hdev, &ver, info, 0);
+				if (err < 0)
+					return err;
+			} else {
+				return err;
+			}
+		}
 		/* WCN6855 2.1 and later will reset to apply firmware downloaded here, so
 		 * wait ~100ms for reset Done then go ahead, otherwise, it maybe
 		 * cause potential enable failure.
-- 
2.34.1