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

[Andrew Lunn]

> > 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