Re: [RFC PATCH net-next] net: dsa: mt7530: fix port specifications for MT7988

[Arınç ÜNAL]

On 6.04.2023 14:07, Russell King (Oracle) wrote:
> On Thu, Apr 06, 2023 at 01:04:45PM +0300, arinc9.unal@xxxxxxxxx wrote:
> > From: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
> >
> > On the switch on the MT7988 SoC, there are only 4 PHYs. There's only port 6
> > as the CPU port, there's no port 5. Split the switch statement with a check
> > to enforce these for the switch on the MT7988 SoC. The internal phy-mode is
> > specific to MT7988 so put it for MT7988 only.
> >
> > Signed-off-by: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
> > ---
> >
> > Daniel, this is based on the information you provided me about the switch.
> > I will add this to my current patch series if it looks good to you.
> >
> > Arınç
> >
> > ---
> >   drivers/net/dsa/mt7530.c | 67 ++++++++++++++++++++++++++--------------
> >   1 file changed, 43 insertions(+), 24 deletions(-)
> >
> > diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> > index 6fbbdcb5987f..f167fa135ef1 100644
> > --- a/drivers/net/dsa/mt7530.c
> > +++ b/drivers/net/dsa/mt7530.c
> > @@ -2548,7 +2548,7 @@ static void mt7988_mac_port_get_caps(struct dsa_switch *ds, int port,
> >   	phy_interface_zero(config->supported_interfaces);
> >   
> >   	switch (port) {
> > -	case 0 ... 4: /* Internal phy */
> > +	case 0 ... 3: /* Internal phy */
> >   		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
> >   			  config->supported_interfaces);
> >   		break;
> > @@ -2710,37 +2710,56 @@ mt753x_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
> >   	struct mt7530_priv *priv = ds->priv;
> >   	u32 mcr_cur, mcr_new;
> >   
> > -	switch (port) {
> > -	case 0 ... 4: /* Internal phy */
> > -		if (state->interface != PHY_INTERFACE_MODE_GMII &&
> > -		    state->interface != PHY_INTERFACE_MODE_INTERNAL)
> > -			goto unsupported;
> > -		break;
> > -	case 5: /* Port 5, a CPU port. */
> > -		if (priv->p5_interface == state->interface)
> > +	if (priv->id == ID_MT7988) {
> > +		switch (port) {
> > +		case 0 ... 3: /* Internal phy */
> > +			if (state->interface != PHY_INTERFACE_MODE_INTERNAL)
>
> How do these end up with PHY_INTERFACE_MODE_INTERNAL ? phylib defaults
> to GMII mode without something else being specified in DT.
>
> Also note that you should *not* be validating state->interface in the
> mac_config() method because it's way too late to reject it - if you get
> an unsupported interface here, then that is down to the get_caps()
> method being buggy. Only report interfaces in get_caps() that you are
> prepared to handle in the rest of the system.

This is already the case for all three get_caps(). The supported 
interfaces for each port are properly defined.

Though mt7988_mac_port_get_caps() clears the 
config->supported_interfaces bitmap before reporting the supported 
interfaces. I don't think this is needed as all bits in the bitmap 
should already be initialized to zero when the phylink_config structure 
is allocated.

I'm not sure if your suggestion is to make sure the supported interfaces 
are properly reported on get_caps(), or validate state->interface 
somewhere else.

Arınç