Re: [PATCH] arm64: dts: imx8mp-debix-model-a: Disable EEE for 1000T

["Russell King (Oracle)" <linux@armlinux.org.uk>]

On Tue, Oct 28, 2025 at 01:46:48AM +0200, Laurent Pinchart wrote:
> On Mon, Oct 27, 2025 at 03:13:51PM +0000, Russell King (Oracle) wrote:
> > On Sun, Oct 26, 2025 at 02:29:04PM +0200, Laurent Pinchart wrote:
> > > Energy Efficient Ethernet (EEE) is broken at least for 1000T on the EQOS
> > > (DWMAC) interface. When connected to an EEE-enabled peer, the ethernet
> > > devices produces an interrupts storm. Disable EEE support to fix it.
> > 
> > We've finally got to the bottom of what's going on here. Please try
> > this patch (it's building locally, but will take some time because
> > I'd wound the tree back to 6.13 and 6.14, so it's going to be a full
> > rebuild.) Thus, there may be compile bugs remaining.
> 
> I've applied it on top of 
> 
> I've started with a branch based on v6.18-rc3 plus "[PATCH net-next 0/5]
> net: stmmac: more cleanups" ([1]) and "[PATCH net-next v2 0/6] net: add
> phylink managed WoL and convert stmmac" ([2]) to make the patch apply
> cleanly.
> 
> [1] https://lore.kernel.org/all/aO_HIwT_YvxkDS8D@shell.armlinux.org.uk/
> [2] https://lore.kernel.org/all/aPnyW54J80h9DmhB@shell.armlinux.org.uk/
> 
> The base branch exhibits the interrupt storm issue. The patch
> unfortunately doesn't fix it.

So it's highly unlikely that your problem is the same as Emanuele's.

Do you know when the interrupt storm behaviour started? If not, I'd
suggest testing 6.13 and 6.14 as a starting point to see whether
the phylink-managed EEE conversion is involved.

Thanks.

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