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Date:   Thu, 23 Jun 2022 09:16:28 -0400 (EDT)
From:   Enguerrand de Ribaucourt 
To:     Andrew Lunn <>
Cc:     davem <>, netdev <>,
        linux-kernel <>,
        linux <>, hkallweit1 <>
Subject: Re: [PATCH 1/2] net: dp83822: disable false carrier interrupt

----- Original Message -----
> From: "Andrew Lunn" <>
> To: "Enguerrand de Ribaucourt" <>
> Cc: "davem" <>, "netdev" <>, "linux-kernel" <>,
> "linux" <>, "hkallweit1" <>
> Sent: Thursday, June 23, 2022 2:42:54 PM
> Subject: Re: [PATCH 1/2] net: dp83822: disable false carrier interrupt

> On Thu, Jun 23, 2022 at 10:51:25AM +0200, Enguerrand de Ribaucourt wrote:
> > When unplugging an Ethernet cable, false carrier events were produced by
> > the PHY at a very high rate. Once the false carrier counter full, an
> > interrupt was triggered every few clock cycles until the cable was
> > replugged. This resulted in approximately 10k/s interrupts.

> > Since the false carrier counter (FCSCR) is never used, we can safely
> > disable this interrupt.

> > In addition to improving performance, this also solved MDIO read
> > timeouts I was randomly encountering with an i.MX8 fec MAC because of
> > the interrupt flood. The interrupt count and MDIO timeout fix were
> > tested on a v5.4.110 kernel.

> Since this is version 2, you should add v2 into the subject line. See
> the submitting patches document in the kernel documentation.

> Also, with patch sets, please include a patch 0/X which describes the
> big picture.

> This is also a bug fix, you are stopping an interrupt storm. So please
> include a Fixes: tag indicating where the issue was introduced.

> The code itself looks good, it is just getting the processes right.

> Andrew

Sorry, I'm still not familiar with the process. I resubmitted the patches
with your recommendations.

Thank you very much for your advice.

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