linux-kernel - Re: [PATCH 0/3] Meson8b/8m2: Ethernet RGMII TX delay fixes

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Message-Id: <20191227.163348.1668601477335834984.davem@davemloft.net>
Date:   Fri, 27 Dec 2019 16:33:48 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     martin.blumenstingl@...glemail.com
Cc:     linux-amlogic@...ts.infradead.org, netdev@...r.kernel.org,
        khilman@...libre.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, balbes-150@...dex.ru,
        ingrassia@...genesys.com, jbrunet@...libre.com,
        linus.luessing@...3.blue
Subject: Re: [PATCH 0/3] Meson8b/8m2: Ethernet RGMII TX delay fixes

From: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Date: Wed, 25 Dec 2019 01:56:52 +0100

> The Ethernet TX performance has been historically bad on Meson8b and
> Meson8m2 SoCs because high packet loss was seen. Today I (presumably)
> found out why this is: the input clock (which feeds the RGMII TX clock)
> has to be at least 4 times 125MHz. With the fixed "divide by 2" in the
> clock tree this means that m250_div needs to be at least 2.
 ...

It looks there needs to be more discussion on this series, please respin
once the discussions are resolved.

Thank you.