linux-kernel - Re: [PATCH net 2/7] net: dsa: mt7530: fix phylink for port 5 and fix port 5 modes

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Date:   Tue, 28 Mar 2023 00:44:18 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>, 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>,
        Russell King <linux@...linux.org.uk>,
        René van Dorst <opensource@...rst.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        erkin.bozoglu@...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 2/7] net: dsa: mt7530: fix phylink for port 5 and fix
 port 5 modes

On 27.03.2023 21:49, Vladimir Oltean wrote:
> On Sun, Mar 26, 2023 at 05:08:13PM +0300, arinc9.unal@...il.com wrote:
>> From: Arınç ÜNAL <arinc.unal@...nc9.com>
>>
>> There're two call paths for setting up port 5:
>>
>> mt7530_setup()
>> -> mt7530_setup_port5()
>>
>> mt753x_phylink_mac_config()
>> -> mt753x_mac_config()
>>     -> mt7530_mac_config()
>>        -> mt7530_setup_port5()
>>
>> The first call path is supposed to run when phy muxing is being used. In
>> this case, port 5 is somewhat of a hidden port. It won't be defined on the
>> devicetree so phylink can't be used to manage the port.
>>
>> The second call path used to call mt7530_setup_port5() directly under case
>> 5 on mt7530_phylink_mac_config() before it was moved to mt7530_mac_config()
>> with 88bdef8be9f6 ("net: dsa: mt7530: Extend device data ready for adding a
>> new hardware"). mt7530_setup_port5() will never run through this call path
>> because the current code on mt7530_setup() bypasses phylink for all cases
>> of port 5.
>>
>> Leave it to phylink if port 5 is used as a CPU port or a user port. For the
>> cases of phy muxing or the port being disabled, call mt7530_setup_port5()
>> directly from mt7530_setup_port5() without involving phylink.
> 
> You probably don't mean "call X() from X()" (that would make it recursive),
> but maybe from mt7530_setup(). But it was already called from mt7530_setup(),
> so I don't understand what is being transmitted here...

Oops, I meant to say call mt7530_setup_port5() directly from 
mt7530_setup() without involving phylink. Will fix.

> 
>>
>> Move setting the interface and P5_DISABLED mode to a more specific
>> location. They're supposed to be overwritten if phy muxing is detected.
>>
>> Add comments which explain the process.
>>
>> Fixes: 38f790a80560 ("net: dsa: mt7530: Add support for port 5")
>> Tested-by: Arınç ÜNAL <arinc.unal@...nc9.com>
>> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
>> ---
> 
> Sorry, I didn't understand... so what was the problem, and how does the
> movement of the mt7530_setup_port5() call that isn't under phylink solve
> that problem?

Port 5 being used as a CPU or user port was being set up from 
mt7530_setup() instead of using phylink. This patch fixes that.

Arınç