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

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Message-ID: <CA+h21hpzCY=+0U4JgFbqGLS=Sh6SjkSt=4J9e0AGVHKJPOHq1A@mail.gmail.com>
Date:   Wed, 26 Feb 2020 20:22:39 +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 20:21, Vladimir Oltean <olteanv@...il.com> wrote:
>
> 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

s/class/clash/

> 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