linux-kernel - Re: [PATCH 02/14] drivers: net: dsa: qca8k: tweak internal delay to oem spec

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Message-ID: <YIK8qYGXG/R1du/C@lunn.ch>
Date:   Fri, 23 Apr 2021 14:25:13 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/14] drivers: net: dsa: qca8k: tweak internal delay to
 oem spec

On Fri, Apr 23, 2021 at 03:47:28AM +0200, Ansuel Smith wrote:
> The original code had the internal dalay set to 1 for tx and 2 for rx.

Do you have any idea what these values mean, in terms of pS?

What value is being passed to the PHY? Since the MAC is providing the
delays, you need to ensure the PHY is not adding a delay. Is there
code doing this?

     Andrew