linux-kernel - Re: [RFC 04/11] net: phy: Handle c22 regs presence better

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Date:   Tue, 26 May 2020 01:46:23 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jeremy Linton <jeremy.linton@....com>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        netdev@...r.kernel.org, davem@...emloft.net, f.fainelli@...il.com,
        hkallweit1@...il.com, madalin.bucur@....nxp.com,
        calvin.johnson@....nxp.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC 04/11] net: phy: Handle c22 regs presence better

> Right, which is what I sort of expected. Because its falling back to a
> device list of 0xFFFFFFFF, which means probe every single MMD.
> 
> Combined with the lack of filtering means that your getting a bunch of MMD
> IDs that potentially are invalid, along with any that happen to be valid.
> Its that behavior (and some others) which were what blew this set up from a
> couple lines of tweaks into this mess.
> 
> I don't really see a way to guess at all the "wrong" ids that are being
> pushed into the system. Which is why I started to think about a "strict"
> mode later in the set. Maybe at this point the only way around some of these
> bugs/side effects/etc is just a second c45 probe routine if we don't think
> its possible to implement a variable strictness scanner in this code path
> without losing phys that previously were detected.

Hi Jeremy

I really think we need to find one of those boards which have a
cortina and see what it actually does. Can you get in contact with NXP
and see if they can find one?

    Thanks
        Andrew