linux-kernel - Re: [PATCH net-next 08/30] net: dsa: mt7530: change p{5,6}_interface to p{5,6}

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Date:   Sun, 4 Jun 2023 16:14:31 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Vladimir Oltean <olteanv@...il.com>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        erkin.bozoglu@...ont.com, mithat.guner@...ont.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 08/30] net: dsa: mt7530: change p{5,6}_interface
 to p{5,6}_configured

On 4.06.2023 16:07, Russell King (Oracle) wrote:
> On Sun, Jun 04, 2023 at 03:55:17PM +0300, Vladimir Oltean wrote:
>> On Sun, Jun 04, 2023 at 01:18:04PM +0100, Russell King (Oracle) wrote:
>>> I don't remember whether Vladimir's firmware validator will fail for
>>> mt753x if CPU ports are not fully described, but that would be well
>>> worth checking. If it does, then we can be confident that phylink
>>> will always be used, and those bypassing calls should not be necessary.
>>
>> It does, I've just retested this:
>>
>> [    8.469152] mscc_felix 0000:00:00.5: OF node /soc/pcie@...000000/ethernet-switch@0,5/ports/port@4 of CPU port 4 lacks the required "phy-handle", "fixed-link" or "managed" properties
>> [    8.494571] mscc_felix 0000:00:00.5: error -EINVAL: Failed to register DSA switch
>> [    8.502151] mscc_felix: probe of 0000:00:00.5 failed with error -22
> 
> ... which isn't listed in dsa_switches_apply_workarounds[], and
> neither is mt753x. Thanks.
> 
> So, that should be sufficient to know that the CPU port will always
> properly described, and thus bypassing phylink in mt753x for the CPU
> port should not be necessary.

Perfect! If I understand correctly, there's this code - specific to 
MT7531 and MT7988 ports being used as CPU ports - which runs in addition 
to what's in mt753x_phylink_mac_config():

	mt7530_write(priv, MT7530_PMCR_P(port),
		     PMCR_CPU_PORT_SETTING(priv->id));

This should be put on mt753x_phylink_mac_config(), under priv->id == 
ID_MT7531, priv->id == ID_MT7988, and dsa_is_cpu_port(ds, port) checks?

Arınç