Re: [PATCH v2 2/2] net: stmmac: Add Ingenic SoCs MAC support.

[周琰杰]

于 Thu, 10 Jun 2021 16:57:29 +0200
Andrew Lunn <andrew@xxxxxxx> 写道:

> > Here is Ingenic's reply, the time length corresponding to a unit is
> > 19.5ps (19500fs).  
> 
> Sometimes, there is a negative offset in the delays. So a delay value
> of 0 written to the register actually means -200ps or something.

Ah, perhaps this explains why we still need to add fine-tuning
parameter in rgmii-id and rgmii-txid modes to ensure that the network
works properly.

> 
>    Andrew