Bluetooth: mt7925: trigger reset on WMT timeout

The MT7925 Bluetooth USB function can enumerate successfully after a warm
reboot while the WMT function-control command remains unresponsive.

When that command times out, btmtk_usb_setup() currently returns
-ETIMEDOUT without entering the existing MediaTek reset path. The existing
USB reset and recovery machinery is therefore never reached.

For MT7925, call btmtk_reset_sync() when the WMT function-control command
times out. This enters the existing reset path in btusb_mtk_reset(), which
performs the MediaTek subsystem reset and queues a USB device reset.

Runtime tracing on the affected hardware showed the resulting path through
usb_queue_reset_device(), usb_reset_device() and
usb_reset_and_verify_device(). When reset and verification could not
restore the device, the USB core escalated to a logical disconnect and
re-enumeration.

Recovery succeeded in three controlled Windows-to-Linux tests. Runtime
tracing showed the existing USB reset path escalating to logical disconnect
and re-enumeration. In two of those tests, tracing continued through the
subsequent enumeration failures and directly captured
usb_acpi_port_prr_reset(), after which the MT7925 re-enumerated and
Bluetooth recovered.

These tests were performed on top of Chia-Lin Kao's ACPI _PRR hub patch,
which remains a prerequisite for this patch.

A fourth Windows-to-Linux test was then performed with the diagnostic btusb
blacklist removed and btusb binding normally during boot. The WMT timeout
reproduced and Bluetooth recovered automatically without manual
intervention.

Signed-off-by: George Maraveyas <george.0xfff@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

drivers/bluetooth/btmtk.c

@@ -1413,6 +1413,10 @@ int btmtk_usb_setup(struct hci_dev *hdev)
 		err = btmtk_usb_hci_wmt_sync(hdev, &wmt_params);
 		if (err < 0) {
 			bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
+
+			if (dev_id == 0x7925 && err == -ETIMEDOUT)
+				btmtk_reset_sync(hdev);
+
 			return err;
 		}