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Date: Fri, 25 Mar 2022 15:08:08 +0100 From: Francesco Dolcini <francesco.dolcini@...adex.com> To: Andrew Lunn <andrew@...n.ch>, Russell King <linux@...linux.org.uk> Cc: netdev <netdev@...r.kernel.org>, fugang.duan@....com, Chris Healy <cphealy@...il.com> Subject: FEC MDIO timeout and polled IO Hello Andrew and all, I was recently debugging an issue in the FEC driver, about 2% of the time the driver is failing with "MDIO read timeout" at boot on a 5.4 kernel. This issue is not new and from time to time appear again, it seems that the previous interrupt based mechanism is somehow easy to break. I backported your patch f166f890c8f0 (net: ethernet: fec: Replace interrupt driven MDIO with polled IO, 2020-05-02) to kernel 5.4 and it seems that it fixes the issue (I was able to do 470 power cycles, while before it was failing after a couple of hundreds cycles best case). Shouldn't this patch be backported to kernel 5.4? Francesco
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