Re: [PATCH v2 11/11] net: dsa: mt7530: use external PCS driver

[Daniel Golle]

On Fri, Feb 10, 2023 at 10:56:57AM +0000, Russell King (Oracle) wrote:
> On Tue, Feb 07, 2023 at 02:24:17PM +0000, Daniel Golle wrote:
> > @@ -2728,11 +2612,11 @@ mt753x_phylink_mac_select_pcs(struct dsa_switch *ds, int port,
> >  
> >  	switch (interface) {
> >  	case PHY_INTERFACE_MODE_TRGMII:
> > +		return &priv->pcs[port].pcs;
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

> >  	case PHY_INTERFACE_MODE_SGMII:
> >  	case PHY_INTERFACE_MODE_1000BASEX:
> >  	case PHY_INTERFACE_MODE_2500BASEX:
> > -		return &priv->pcs[port].pcs;
> > -
> > +		return priv->ports[port].sgmii_pcs;
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> My only concern here is that we also use the PCS when in TRGMII mode in
> this driver, but the mtk pcs code from mtk_eth_soc doesn't handle
> TRGMII (and getting the link timer will fail for this mode, causing
> the pcs_config() method to fail.)
> 
> Thus, this driver will stop working in TRGMII mode.

But in TRGMII mode we return &priv->pcs[port].pcs which is not the PCS
code from mtk_eth_soc now moved to the new pcs-mtk-lynxi driver, but
rather the old existing codepath from mt7530.c.

The new PCS driver only replaces mt7531_sgmii_pcs_* functions, which
were all nearly identical with what is now in pcs-mtk-lynxi.c.

Or do I miss something here?