netdev - Re: [PATCH net-next v6] net: phy: intel-xway: Add RGMII internal delay configuration

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Date:   Tue, 11 Jan 2022 14:34:19 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Martin Schiller <ms@....tdt.de>
Cc:     Tim Harvey <tharvey@...eworks.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        martin.blumenstingl@...glemail.com,
        Florian Fainelli <f.fainelli@...il.com>, hkallweit1@...il.com,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        David Miller <davem@...emloft.net>, kuba@...nel.org,
        netdev <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v6] net: phy: intel-xway: Add RGMII internal
 delay configuration

> > Martin,
> > 
> > I've got some boards with the GPY111 phy on them and I'm finding that
> > modifying XWAY_MDIO_MIICTRL to change the skew has no effect unless I
> > do a soft reset (BCMR_RESET) first. I don't see anything in the
> > datasheet which specifies this to be the case so I'm interested it
> > what you have found. Are you sure adjusting the skews like this
> > without a soft (or hard pin based) reset actually works?
> > 
> > Best regards,
> > 
> > Tim
> 
> Hello Tim,
> 
> yes, you are right. It is not applied immediately. The link needs to be
> toggled to get this settings active. But my experience shows that this
> would be done in the further boot process anyway e.g. by restarting the
> autonegotiation etc.

Hi Martin

Have you verified this? Maybe try NFS root, so the kernel is the one
up'ing the interface, before user space exists.

       Andrew