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

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

On Mon, Oct 27, 2025 at 11:44:52AM +0100, Oleksij Rempel wrote:
> On Mon, Oct 27, 2025 at 10:34:35AM +0000, Russell King (Oracle) wrote:
> > On Mon, Oct 27, 2025 at 12:31:07PM +0200, Laurent Pinchart wrote:
> > > On Mon, Oct 27, 2025 at 11:23:03AM +0100, Oleksij Rempel wrote:
> > > > On Mon, Oct 27, 2025 at 12:02:27PM +0200, Laurent Pinchart wrote:
> > > > > Hi Oleksij,
> > > > > > Please note, RTL8211E PHY do use undocumented SmartEEE mode by default.
> > > > > > It ignores RGMII LPI opcodes and doing own thing. It can be confirmed by
> > > > > > monitoring RGMII TX and MDI lines with oscilloscope and changing
> > > > > > tx-timer configurations. I also confirmed this information from other
> > > > > > source. To disable SmartEEE and use plain MAC based mode, NDA documentation
> > > > > > is needed.
> > > > > 
> > > > > That's useful information, thank you. Would you by any chance to know if
> > > > > such NDA would allow contributing the feature upstream ?
> > > > 
> > > > Good question, but the NDA process was actually aborted. We didn't move
> > > > forward due to a lack of time and ultimately, a lack of commercial
> > > > interest from any projects or customers for this PHY.
> > > 
> > > Fair enough. I've tried :-)
> > > 
> > > If we can't disable SmartEEE in the PHY, does it mean we need to somehow
> > > disable EEE in the MAC, but still program the PHY to advertise EEE to
> > > the link partner ?
> > 
> > Or maybe the PHY needs to have EEE capability disabled?
> 
> Ack. With comment in the code, why we prefer this way, in case some one
> wont to spend time on making it work. Probably SmartEEE or some other
> word should be used.

So we have options.

However, we need to get to the bottom of what caused the change of
behaviour before we start throwing solutions at this.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!