linux-kernel - Re: [PATCH v2 3/4] net: phy: realtek: add disable RX internal delay mode

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Date:   Thu, 24 Aug 2017 15:12:21 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     icenowy@...c.io
Cc:     devicetree@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        Corentin Labbe <clabbe.montjoie@...il.com>,
        Icenowy Zheng <icenowy@...c.xyz>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/4] net: phy: realtek: add disable RX internal delay
 mode

> >Do we know that the TX lines do have a delay after making this change?
> >We need to be careful here. We will get into a mess if this is
> >actually RGMII not RGMII_TXID, and somebody designs a board which
> >needs RGMII-TXID.
> 
> In fact I'm not sure -- I'm even not sure that after making this change
> there's no TX delay. The change is totally not documented, so I choose
> to use a custom property in v1.

Can you get in touch with Realtek and ask? Or can you get a hardware
guy to do some measurements?

Thanks
    Andrew