netdev - ravb ethernet failures in 4.19.148 and -cip kernels

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Date:   Sun, 4 Oct 2020 23:24:12 +0200
From:   Pavel Machek <pavel@...x.de>
To:     ashiduka@...itsu.com, sergei.shtylyov@...il.com,
        davem@...emloft.net, yoshihiro.shimoda.uh@...esas.com,
        damm+renesas@...nsource.se, tho.vu.wh@....renesas.com,
        kazuya.mizuguchi.ks@...esas.com, horms+renesas@...ge.net.au,
        fabrizio.castro@...renesas.com, netdev@...r.kernel.org
Cc:     Chris.Paterson2@...esas.com
Subject: ravb ethernet failures in 4.19.148 and -cip kernels

Hi!

It seems

commit fb3a780e7a76cf8efb055f8322ec039923cee41f
Author: Yuusuke Ashizuka <ashiduka@...itsu.com>
Date:   Thu Aug 20 18:43:07 2020 +0900

    ravb: Fixed to be able to unload modules

causes problems in at least -cip-rt kernels. (I'd have to verify it is
present in -cip and plain -stable). Symptoms are like this:

[    2.798301] [drm] Cannot find any crtc or sizes
[    2.805866] hctosys: unable to open rtc device (rtc0)
[    2.811937] libphy: ravb_mii: probed
[    2.821001] RTL8211E Gigabit Ethernet e6800000.ethernet-ffffffff:00: attached PHY driver [RTL8211E Gigabit Ethernet] (mii_bus:phy_addr=e6800000.ethernet-ffffffff:00, irq=190)
[    2.838052] RTL8211E Gigabit Ethernet e6800000.ethernet-ffffffff:00: Master/Slave resolution failed, maybe conflicting manual settings?
[   12.841484] Waiting up to 110 more seconds for network.
[   22.853482] Waiting up to 100 more seconds for network.
[   32.865482] Waiting up to 90 more seconds for network.
[   42.877482] Waiting up to 80 more seconds for network.
[   52.889482] Waiting up to 70 more seconds for network.
[   62.901482] Waiting up to 60 more seconds for network.
[   72.913482] Waiting up to 50 more seconds for network.
[   82.925482] Waiting up to 40 more seconds for network.
[   92.937482] Waiting up to 30 more seconds for network.
[  102.949482] Waiting up to 20 more seconds for network.
[  112.961482] Waiting up to 10 more seconds for network.
[  122.861490] Sending DHCP requests ...... timed out!
[  209.890289] IP-Config: Retrying forever (NFS root)...
[  209.895535] libphy: ravb_mii: probed
[  209.899386] mdio_bus e6800000.ethernet-ffffffff: MDIO device at address 0 is missing.
[  209.910604] ravb e6800000.ethernet eth0: failed to connect PHY
[  209.916705] IP-Config: Failed to open eth0
[  219.925483] Waiting up to 110 more seconds for network.
[  229.937481] Waiting up to 100 more seconds for network.
[  239.949481] Waiting up to 90 more seconds for network.
[  249.961481] Waiting up to 80 more seconds for network.

Full log is available at
https://lava.ciplatform.org/scheduler/job/56398 .

Reverting the above patch fixes the problems.

If you have any ideas what could be going on there, let me know.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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