linux-kernel - Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is up without PHY

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Message-ID: <20200127114600.GU25745@shell.armlinux.org.uk>
Date:   Mon, 27 Jan 2020 11:46:00 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is
 up without PHY

On Mon, Jan 27, 2020 at 11:38:05AM +0000, Jose Abreu wrote:
> From: Russell King - ARM Linux admin <linux@...linux.org.uk>
> Date: Jan/27/2020, 11:21:02 (UTC+00:00)
> 
> > On Mon, Jan 27, 2020 at 12:09:11PM +0100, Jose Abreu wrote:
> > > When we don't have any real PHY driver connected and we get link up from
> > > PCS we shall configure MAC and PCS for the desired speed and also
> > > resolve the flow control settings from MAC side.
> > 
> > This is certainly the wrong place for it.  Please hold off on this patch
> > for the time being.  Thanks.
> 
> This is actually the change that makes everything work ...
> 
> I need to configure PCS before Aneg is complete and then I need to 
> configure MAC once Aneg is done and link is up with the outcome speed and 
> flow control.

Yes, I realise that, but it comes with the expense of potentially
breaking mvneta and mvpp2, where the settings are automatically
passed between the PCS and MAC in hardware. I also believe DSA
works around this, and I need to look at that.

However, right now I'm in the middle of rebasing my git tree on
top of v5.5 and can't say much more until I've finished that.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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