netdev - Re: [PATCH net-next v2] net: dsa: mt7530: do not set MT7530_P5

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Message-ID: <b0368cc8-927c-45ec-8adb-253c141943e2@lunn.ch>
Date: Mon, 29 Apr 2024 14:52:23 +0200
From: Andrew Lunn <andrew@...n.ch>
To: arinc.unal@...nc9.com
Cc: Daniel Golle <daniel@...rotopia.org>, DENG Qingfang <dqfext@...il.com>,
	Sean Wang <sean.wang@...iatek.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...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>,
	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 v2] net: dsa: mt7530: do not set MT7530_P5_DIS
 when PHY muxing is being used

On Sun, Apr 28, 2024 at 12:19:58PM +0300, Arınç ÜNAL via B4 Relay wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> DSA initalises the ds->num_ports amount of ports in
> dsa_switch_touch_ports(). When the PHY muxing feature is in use, port 5
> won't be defined in the device tree. Because of this, the type member of
> the dsa_port structure for this port will be assigned DSA_PORT_TYPE_UNUSED.
> The dsa_port_setup() function calls ds->ops->port_disable() when the port
> type is DSA_PORT_TYPE_UNUSED.
> 
> The MT7530_P5_DIS bit is unset in mt7530_setup() when PHY muxing is being
> used. mt7530_port_disable() which is assigned to ds->ops->port_disable() is
> called afterwards. Currently, mt7530_port_disable() sets MT7530_P5_DIS
> which breaks network connectivity when PHY muxing is being used.
> 
> Therefore, do not set MT7530_P5_DIS when PHY muxing is being used.
> 
> Fixes: 377174c5760c ("net: dsa: mt7530: move MT753X_MTRAP operations for MT7530")
> Reported-by: Daniel Golle <daniel@...rotopia.org>
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew