netdev - Re: [PATCH net-next 3/4] net: phy: smsc: fix and improve WoL support

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Message-ID: <cca8e9e6-a063-4e00-87af-f59ea926cce3@lunn.ch>
Date: Mon, 21 Jul 2025 15:26:28 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Gatien Chevallier <gatien.chevallier@...s.st.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Christophe Roullier <christophe.roullier@...s.st.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Simon Horman <horms@...nel.org>,
	Tristram Ha <Tristram.Ha@...rochip.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 3/4] net: phy: smsc: fix and improve WoL support

> +static int smsc_phy_suspend(struct phy_device *phydev)
> +{
> +	if (!phydev->wol_enabled)
> +		return genphy_suspend(phydev);
> +
> +	return 0;
> +}

Suspend/resume is somewhat complex, and i don't know all the
details. But this looks odd. Why does the phylib core call suspend
when phydev->wol_enabled is true? That at least needs an explanation
in the commit message.

> +static int smsc_phy_resume(struct phy_device *phydev)
> +{
> +	int rc;
> +
> +	if (!phydev->wol_enabled)
> +		return genphy_resume(phydev);
> +
> +	rc = phy_read_mmd(phydev, MDIO_MMD_PCS, MII_LAN874X_PHY_MMD_WOL_WUCSR);
> +	if (rc < 0)
> +		return rc;
> +
> +	if (!(rc & MII_LAN874X_PHY_WOL_STATUS_MASK))
> +		return 0;
> +
> +	dev_info(&phydev->mdio.dev, "Woke up from LAN event.\n");

Please don't spam the log. It is clear the system woke up, there are
messages in the log...

	Andrew