linux-kernel - Re: [PATCH net v1] mlxbf-gige: Support workaround for MDIO GPIO degradation bug

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Message-ID: <c6f5da79-df83-4fad-9bfc-6fd45940d10f@lunn.ch>
Date: Wed, 2 Jul 2025 23:26:42 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Asmaa Mnebhi <asmaa@...dia.com>
Cc: "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Thompson <davthompson@...dia.com>
Subject: Re: [PATCH net v1] mlxbf-gige: Support workaround for MDIO GPIO
 degradation bug

> > You need to put the MDIO bus device into its own pm_domain. Try
> > calling dev_pm_domain_set() to separate the MDIO bus from the MAC
> > driver in terms of power domains. ethtool will then power on/off the
> > MAC but leave the MDIO bus alone.
> > 

> Using dev_pm_domain_set() has the same effect as SET_RUNTIME_PM_OPS. The dev struct is shared so ethtool is still calling the suspend/resume.
> 
> int mlxbf_gige_mdio_probe(struct platform_device *pdev, struct mlxbf_gige *priv)
>  {
>         struct device *dev = &pdev->dev;
> @@ -390,14 +418,27 @@ int mlxbf_gige_mdio_probe(struct platform_device *pdev, struct mlxbf_gige *priv)
>         snprintf(priv->mdiobus->id, MII_BUS_ID_SIZE, "%s",
>                  dev_name(dev));
> 
> +       pm_runtime_set_autosuspend_delay(priv->mdiobus->parent, 100);
> +       pm_runtime_use_autosuspend(priv->mdiobus->parent);

Why parent?

	Andrew