Subject: Re: [PATCH net-next 2/3] net: ethernet: socionext: add AVE ethernet driver

From: Andrew Lunn <[email-masked]>
Date: Mon, 11 Sep 2017 14:00:09 +0200

> > > +static irqreturn_t ave_interrupt(int irq, void *netdev)
> > > +{
> > > +	struct net_device *ndev = (struct net_device *)netdev;
> > > +	struct ave_private *priv = netdev_priv(ndev);
> > > +	u32 gimr_val, gisr_val;
> > > +
> > > +	gimr_val = ave_irq_disable_all(ndev);
> > > +
> > > +	/* get interrupt status */
> > > +	gisr_val = ave_r32(ndev, AVE_GISR);
> > > +
> > > +	/* PHY */
> > > +	if (gisr_val & AVE_GI_PHY) {
> > > +		ave_w32(ndev, AVE_GISR, AVE_GI_PHY);
> > > +		if (priv->internal_phy_interrupt)
> > > +			phy_mac_interrupt(ndev->phydev, ndev->phydev->link);
> > 
> > Humm. I don't think this is correct. You are supposed to give it the
> > new link state, not the old.
> > 
> > What does a PHY interrupt mean here? 
> 
> In the general case, I think PHY events like changing link state are transmitted
> to CPU as interrupt via interrupt controller, then PHY driver itself can handle
> the interrupt.
> 
> And in this case, PHY events are transmitted to MAC as one of its interrupt factor,
> then I thought that MAC driver had to tell the events to PHY.

Could this be in-band SGMI signalling from the PHY to the MAC? Does
the documentation give examples of when this interrupt will happen?

    Andrew