linux-kernel - Re: PROBLEM: Broken or delayed ethernet on Xilinx ZCU104 since 5.18 (regression)

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Message-ID: <bc983c94-6276-4282-8b59-7e706932f903@lunn.ch>
Date:   Sat, 5 Aug 2023 09:03:33 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Nick Bowler <nbowler@...conx.ca>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Rob Herring <robh@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: PROBLEM: Broken or delayed ethernet on Xilinx ZCU104 since 5.18
 (regression)

> The result is the same for all six calls.  The macb_mdiobus_register
> function returns -EPROBE_DEFER, which comes from the topmost call
> to of_mdiobus_register within that function.  That is, this is the
> part that returns -EPROBE_DEFER:
> 
> 	child = of_get_child_by_name(np, "mdio");
> 	if (child) {
> 		int ret = of_mdiobus_register(bp->mii_bus, child);
> 
> 		of_node_put(child);
> 		return ret;
> 	}

So you need to keep going down and seeing where is EPROBE_DEFER is
coming from.

You are missing some resource somewhere, probably because you are
missing a driver. Sometimes it is worth running a distro kernel which
has nearly everything enabled as modules, so you can find out what you
actually need. Then use 'make localmodconfig' to reduce the
configuration down to just what you need.

	Andrew