linux-kernel - Re: [PATCH net-next v2 6/7] net: dsa: mt7530: do not set priv->p5_interface on mt7530_setup

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Date: Thu, 4 Jan 2024 17:42:41 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Arınç ÜNAL <arinc.unal@...nc9.com>
Cc: Daniel Golle <daniel@...rotopia.org>,
	Landen Chao <Landen.Chao@...iatek.com>,
	DENG Qingfang <dqfext@...il.com>,
	Sean Wang <sean.wang@...iatek.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>,
	Frank Wunderlich <frank-w@...lic-files.de>,
	Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
	mithat.guner@...ont.com, 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-next v2 6/7] net: dsa: mt7530: do not set
 priv->p5_interface on mt7530_setup_port5()

On Wed, Dec 27, 2023 at 07:43:46AM +0300, Arınç ÜNAL wrote:
> priv->p5_interface and priv->p6_interface are for use on the MT7531 switch.
> They prevent the CPU ports of MT7531 to be configured again. They are
> useless for MT7530. Therefore, remove setting priv->p5_interface for
> MT7530.
> 
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---

What makes priv->p5_interface and priv->p6_interface useless for MT7530
as you say? This code in mt753x_phylink_mac_config() seems executed
regardless of switch family:

	case 5:
		if (priv->p5_interface == state->interface)
			break;

		if (mt753x_mac_config(ds, port, mode, state) < 0)
			goto unsupported;

		if (priv->p5_intf_sel != P5_DISABLED)
			priv->p5_interface = state->interface;
		break;
	case 6:
		if (priv->p6_interface == state->interface)
			break;

		mt753x_pad_setup(ds, state);

		if (mt753x_mac_config(ds, port, mode, state) < 0)
			goto unsupported;

		priv->p6_interface = state->interface;
		break;