Subject: Re: Re: Re: [PATCH net-next v12 08/18] net: ethernet: mtk_eth_soc: fix 1000Base-X and 2500Base-X modes

From: "Russell King (Oracle)" <[email-masked]>
Date: Sun, 12 Mar 2023 20:05:41 +0000

On Sun, Mar 12, 2023 at 01:40:36PM +0100, Frank Wunderlich wrote:
> > Gesendet: Samstag, 11. März 2023 um 21:30 Uhr
> > Von: "Russell King (Oracle)" <[email-masked]>
> 
> > On Sat, Mar 11, 2023 at 09:21:47PM +0100, Frank Wunderlich wrote:
> > > Am 11. März 2023 21:00:20 MEZ schrieb "Russell King (Oracle)" <[email-masked]>:
> > > >On Sat, Mar 11, 2023 at 01:05:37PM +0100, Frank Wunderlich wrote:
> > > 
> > > >> i got the 2.5G copper sfps, and tried them...they work well with the v12 (including this patch), but not in v13... 
> > > 
> > > >> how can we add a quirk to support this?
> > > >
> > > >Why does it need a quirk?
> > > 
> > > To disable the inband-mode for this 2.5g copper
> > > sfp. But have not found a way to set a flag which i
> > > can grab in phylink.
> > 
> > We could make sfp_parse_support() set Autoneg, Pause, and Asym_Pause
> > in "modes" at the top of that function, and then use the SFP modes
> > quirk to clear the Autoneg bit for this SFP. Would that work for you?
> 
> i already tried this (without moving the autoneg/pause to sfp_parse_support):
> 
> static void sfp_quirk_disable_autoneg(const struct sfp_eeprom_id *id,
> 				unsigned long *modes,
> 				unsigned long *interfaces)
> {
> 	linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, modes);
> }
> 
> quirk was executed, but no change (no link on 2g5 sfp).

It won't have any effect on its own - because sfp_parse_support() does
this:

        if (bus->sfp_quirk && bus->sfp_quirk->modes)
                bus->sfp_quirk->modes(id, modes, interfaces);

        linkmode_or(support, support, modes);

        phylink_set(support, Autoneg);
        phylink_set(support, Pause);
        phylink_set(support, Asym_Pause);

Which means clearing Autoneg in "modes" via the modes SFP quirk will
have *absolutely* *no* *effect* what so ever.

The fact that you replied having *not* followed my suggestion and then
itimiating that it doesn't work is very frustrating.

> i guess you mean moving code handling the dt-property for inband-mode in phylink_parse_mode (phylink.c) to the sfp-function (drivers/net/phy/sfp-bus.c)

No.

[rest of email cut because I can't be bothered to read it after this]

Please try what I suggested. You might find that it works.

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