netdev - Re: [PATCH net-next v2 1/8] net: phylink: propagate resolved link config via mac_link

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Date:   Wed, 26 Feb 2020 20:21:47 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        linux-stm32@...md-mailman.stormreply.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Ioana Radulescu <ruxandra.radulescu@....com>,
        Jonathan Corbet <corbet@....net>,
        Michal Simek <michal.simek@...inx.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        John Crispin <john@...ozen.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        netdev <netdev@...r.kernel.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Felix Fietkau <nbd@....name>
Subject: Re: [PATCH net-next v2 1/8] net: phylink: propagate resolved link
 config via mac_link_up()

On Wed, 26 Feb 2020 at 15:36, Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
>
>
> dpaa2 is complicated by the firmware, and that we can't switch the
> interface mode between (SGMII,1000base-X) and 10G.
>
> If the firmware is in "DPMAC_LINK_TYPE_PHY" mode, it expects to be told
> the current link parameters via the dpmac_set_link_state() call - it
> isn't clear whether that needs to be called for other modes with the
> up/down state (firmware API documentation is poor.)
>

With PCS control in Linux, I am pretty sure that you don't want
anything other than DPMAC_LINK_TYPE_PHY anyway.
Basically in DPMAC_LINK_TYPE_FIXED, the MC firmware is in control of
the PCS and polls its link state to emit link notifications to objects
connected to the DPMAC. So Linux control of PCS would class with
firmware control of the PCS, leading to undesirable side-effects to
say the least.

> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
> According to speedtest.net: 11.9Mbps down 500kbps up

Regards,
-Vladimir