On 2024-05-09 23:12:43 +0200, Andrew Lunn wrote: > > + /* Link verification */ > > + rtsn_modify(priv, MLVC, MLVC_PLV, MLVC_PLV); > > + ret = rtsn_reg_wait(priv, MLVC, MLVC_PLV, 0); > > + if (ret) > > + return ret; > > What is link verification? It's a part of the TSN capabilities, it verifies if the link is capable of preemption. AFIK it's described in IEEE802.1Qbu Frame Preemption Protocol. For this device in particular, this register writes enables the Link Verification process. Which in turn allows the IP to transmitting Verify frames, which if replied too with a valid Reply frame by the other node lets the IP know the link supports preemption. -- Kind Regards, Niklas Söderlund
