linux-kernel - Re: [PATCH net 2/3] net: stmmac: socfpga: Don't check for phy to enable the SGMII adapter

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Message-ID: <aAduzwMTLvaeyQkb@shell.armlinux.org.uk>
Date: Tue, 22 Apr 2025 11:26:23 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: davem@...emloft.net, Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	thomas.petazzoni@...tlin.com, Simon Horman <horms@...nel.org>,
	Alexis Lothoré <alexis.lothore@...tlin.com>
Subject: Re: [PATCH net 2/3] net: stmmac: socfpga: Don't check for phy to
 enable the SGMII adapter

On Tue, Apr 22, 2025 at 11:46:56AM +0200, Maxime Chevallier wrote:
> The SGMII adapter needs to be enabled for both Cisco SGMII and 1000BaseX
> operations. It doesn't make sense to check for an attached phydev here,
> as we simply might not have any, in particular if we're using the
> 1000BaseX interface mode.
> 
> So, check only for the presence of a SGMII adapter to re-enable it after
> a link config.

I wonder whether:

	struct stmmac_priv *priv = netdev_priv(dev_get_drvdata(dwmac->dev));

	if ((priv->plat->phy_interface == PHY_INTERFACE_MODE_SGMII ||
	     priv->plat->phy_interface == PHY_INTERFACE_MODE_1000BASEX) &&
	    sgmii_adapter_base)
 		writew(SGMII_ADAPTER_ENABLE,
 		       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);

would describe the required functionality here better, making it clear
under which interface modes we expect to set the enable bits.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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