wifi: mt76: mt7925: add MT7927 USB support

Add the MT7927 USB device ID and normalize the raw 0x6639 CHIPID to
MT7927 so the shared mt7925u code can use the proper chip-specific paths.

Restore the required band setup after USB MAC reset before restarting
the device.

Signed-off-by: Sean Wang <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Felix Fietkau <[email protected]>

mt7925/usb.c

@@ -10,6 +10,8 @@
 #include "mac.h"
 
 static const struct usb_device_id mt7925u_device_table[] = {
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x0e8d, 0x6639, 0xff, 0xff, 0xff),
+		.driver_info = (kernel_ulong_t)MT7925_FIRMWARE_WM },
 	{ USB_DEVICE_AND_INTERFACE_INFO(0x0e8d, 0x7925, 0xff, 0xff, 0xff),
 		.driver_info = (kernel_ulong_t)MT7925_FIRMWARE_WM },
 	/* Netgear, Inc. A8500 */
@@ -123,6 +125,12 @@ static int mt7925u_mac_reset(struct mt792x_dev *dev)
 	if (err)
 		goto out;
 
+	if (is_mt7927(&dev->mt76)) {
+		err = mt7925_mcu_set_dbdc(&dev->mphy, true);
+		if (err)
+			goto out;
+	}
+
 	err = __mt7925_start(&dev->phy);
 out:
 	clear_bit(MT76_RESET, &dev->mphy.state);
@@ -200,6 +208,13 @@ static int mt7925u_probe(struct usb_interface *usb_intf,
 		    (mt76_rr(dev, MT_HW_REV) & 0xff);
 	dev_dbg(mdev->dev, "ASIC revision: %04x\n", mdev->rev);
 
+	if (mt76_chip(mdev) == 0x6639) {
+		dev_dbg(mdev->dev,
+			"MT7927 raw CHIPID=0x%04x, forcing chip=0x7927\n",
+			mt76_chip(mdev));
+		mdev->rev = (0x7927 << 16) | (mdev->rev & 0xff);
+	}
+
 	if (mt76_get_field(dev, MT_CONN_ON_MISC, MT_TOP_MISC2_FW_N9_RDY)) {
 		ret = mt792xu_wfsys_reset(dev);
 		if (ret)

usb.c

@@ -925,6 +925,7 @@ mt76u_ac_to_hwq(struct mt76_dev *dev, struct mt76_queue *q, u8 qid)
 		q->ep = q->hw_idx + 1;
 		break;
 	}
+	case 0x6639:
 	case 0x7961:
 	case 0x7925:
 		q->hw_idx = mt76_ac_to_hwq(ac);