[PATCH v2 1/8] Bluetooth: btmtk: Add MT6639 (MT7927) Bluetooth support

[Javier Tia]

The MediaTek MT7927 (Filogic 380) combo WiFi 7 + BT 5.4 module uses
hardware variant 0x6639 for its Bluetooth subsystem. Without this patch,
the chip fails with "Unsupported hardware variant (00006639)" or hangs
during firmware download.

Three changes are needed to support MT6639:

1. CHIPID workaround: On some boards the BT USB MMIO register reads
   0x0000 for dev_id, causing the driver to skip the 0x6639 init path.
   Force dev_id to 0x6639 when it reads zero, matching the equivalent
   WiFi-side workaround that forces chip=0x7927.

2. Firmware naming: MT6639 uses firmware version prefix "2_1" instead of
   "1_1" used by MT7925 and other variants. The firmware path is
   mediatek/mt6639/BT_RAM_CODE_MT6639_2_1_hdr.bin.

3. Section filtering: The MT6639 firmware binary contains 9 sections, but
   only sections with (dlmodecrctype & 0xff) == 0x01 are Bluetooth-related.
   Sending the remaining WiFi/other sections causes an irreversible BT
   subsystem hang requiring a full power cycle. This matches the Windows
   driver behavior observed via USB captures.

Also add 0x6639 to the reset register (CONNV3) and firmware setup switch
cases alongside the existing 0x7925 handling.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=221096
Link: https://github.com/openwrt/mt76/issues/927
Reported-by: Ryan Gilbert <xelnaga at gmail.com>
Signed-off-by: Javier Tia <floss at jetm.me>
---
 drivers/bluetooth/btmtk.c | 23 +++++++++++++++++++++--
 drivers/bluetooth/btmtk.h |  1 +
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c
index 2507d587f28a..13c6e45deede 100644
--- a/drivers/bluetooth/btmtk.c
+++ b/drivers/bluetooth/btmtk.c
@@ -112,7 +112,11 @@ static void btmtk_coredump_notify(struct hci_dev *hdev, int state)
 void btmtk_fw_get_filename(char *buf, size_t size, u32 dev_id, u32 fw_ver,
 			   u32 fw_flavor)
 {
-	if (dev_id == 0x7925)
+	if (dev_id == 0x6639)
+		snprintf(buf, size,
+			 "mediatek/mt%04x/BT_RAM_CODE_MT%04x_2_%x_hdr.bin",
+			 dev_id & 0xffff, dev_id & 0xffff, (fw_ver & 0xff) + 1);
+	else if (dev_id == 0x7925)
 		snprintf(buf, size,
 			 "mediatek/mt%04x/BT_RAM_CODE_MT%04x_1_%x_hdr.bin",
 			 dev_id & 0xffff, dev_id & 0xffff, (fw_ver & 0xff) + 1);
@@ -130,6 +134,7 @@ EXPORT_SYMBOL_GPL(btmtk_fw_get_filename);
 int btmtk_setup_firmware_79xx(struct hci_dev *hdev, const char *fwname,
 			      wmt_cmd_sync_func_t wmt_cmd_sync)
 {
+	struct btmtk_data *data = hci_get_priv(hdev);
 	struct btmtk_hci_wmt_params wmt_params;
 	struct btmtk_patch_header *hdr;
 	struct btmtk_global_desc *globaldesc = NULL;
@@ -166,6 +171,14 @@ int btmtk_setup_firmware_79xx(struct hci_dev *hdev, const char *fwname,
 		section_offset = le32_to_cpu(sectionmap->secoffset);
 		dl_size = le32_to_cpu(sectionmap->bin_info_spec.dlsize);
 
+		/* MT6639: only download sections where dlmode byte0 == 0x01,
+		 * matching the Windows driver behavior which skips WiFi/other
+		 * sections that would cause the chip to hang.
+		 */
+		if (data->dev_id == 0x6639 && dl_size > 0 &&
+		    (le32_to_cpu(sectionmap->bin_info_spec.dlmodecrctype) & 0xff) != 0x01)
+			continue;
+
 		if (dl_size > 0) {
 			retry = 20;
 			while (retry > 0) {
@@ -852,7 +865,7 @@ int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
 		if (err < 0)
 			return err;
 		msleep(100);
-	} else if (dev_id == 0x7925) {
+	} else if (dev_id == 0x7925 || dev_id == 0x6639) {
 		err = btmtk_usb_uhw_reg_read(hdev, MTK_BT_RESET_REG_CONNV3, &val);
 		if (err < 0)
 			return err;
@@ -1322,6 +1335,11 @@ int btmtk_usb_setup(struct hci_dev *hdev)
 		fw_flavor = (fw_flavor & 0x00000080) >> 7;
 	}
 
+	if (!dev_id) {
+		bt_dev_info(hdev, "MT6639: raw CHIPID=0x0000, forcing chip=0x6639");
+		dev_id = 0x6639;
+	}
+
 	btmtk_data->dev_id = dev_id;
 
 	err = btmtk_register_coredump(hdev, btmtk_data->drv_name, fw_version);
@@ -1339,6 +1357,7 @@ int btmtk_usb_setup(struct hci_dev *hdev)
 	case 0x7925:
 	case 0x7961:
 	case 0x7902:
+	case 0x6639:
 		btmtk_fw_get_filename(fw_bin_name, sizeof(fw_bin_name), dev_id,
 				      fw_version, fw_flavor);
 
diff --git a/drivers/bluetooth/btmtk.h b/drivers/bluetooth/btmtk.h
index adaf385626ee..6645bcadb523 100644
--- a/drivers/bluetooth/btmtk.h
+++ b/drivers/bluetooth/btmtk.h
@@ -8,6 +8,7 @@
 #define FIRMWARE_MT7902		"mediatek/BT_RAM_CODE_MT7902_1_1_hdr.bin"
 #define FIRMWARE_MT7961		"mediatek/BT_RAM_CODE_MT7961_1_2_hdr.bin"
 #define FIRMWARE_MT7925		"mediatek/mt7925/BT_RAM_CODE_MT7925_1_1_hdr.bin"
+#define FIRMWARE_MT7927		"mediatek/mt6639/BT_RAM_CODE_MT6639_2_1_hdr.bin"
 
 #define HCI_EV_WMT 0xe4
 #define HCI_WMT_MAX_EVENT_SIZE		64

-- 
2.53.0