netdev - Re: [PATCHv2 net-next 11/16] net: mvpp2: handle misc PPv2.1/PPv2.2 differences

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Date:   Tue, 14 Feb 2017 15:53:13 +0100
From:   Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Kumar Gala <galak@...eaurora.org>,
        Andrew Lunn <andrew@...n.ch>,
        Yehuda Yitschak <yehuday@...vell.com>,
        Jason Cooper <jason@...edaemon.net>,
        Hanna Hawa <hannah@...vell.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Stefan Chulski <stefanc@...vell.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        linux-arm-kernel@...ts.infradead.org,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCHv2 net-next 11/16] net: mvpp2: handle misc PPv2.1/PPv2.2
 differences

Hello,

On Sat, 7 Jan 2017 09:38:34 +0000, Russell King - ARM Linux wrote:

> This has the side effect that nothing clears the port reset bit in the
> GMAC, which means there's no hope of the interface working - with the
> reset bit set, the port is well and truely held in "link down" state.

Things were working fine here on Armada 7K/8K even without calling
mvpp21_port_power_up(port). But I've looked into more details, and in
fact the whole function makes sense on PPv2.2, except the
mvpp2_port_fc_adv_enable(port) part of it. So I've replaced this with:

	mvpp2_port_mii_set(port);
	mvpp2_port_periodic_xon_disable(port);

	if (priv->hw_version == MVPP21)
		mvpp2_port_fc_adv_enable(port);

	mvpp2_port_reset(port);

This will be in my v3.

> In any case, the GMAC part is much the same as mvneta, and I think
> that code should be shared rather than writing new versions of it.

Possibly, but it's really a separate thing: this is completely
independent from introducing PPv2.2 support, it's something that
already exists. The patch series is already 16 patches long in its v2,
and is going to even a bit longer in its v3, so I would really like to
stick to just PPv2.2 support.

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com