1)
Add function cq_test to ps4_bridge.c

static int cq_test(void)
{
    u8 reply[0x10];
    int ret;
    ret = apcie_icc_cmd(2, 0x16, NULL, 0, reply, 0x10);
    DRM_ERROR("ret=%d, reply %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", ret,
        reply[0], reply[1], reply[2], reply[3],
        reply[4], reply[5], reply[6], reply[7],
        reply[8], reply[9], reply[10], reply[11],
        reply[12], reply[13], reply[14], reply[15]);
    return ret;
}

2)
add cq_test(); to static void mnXXXXX_enable(struct drm_bridge *bridge)