Re: [PATCH net-next v1 1/1] net: phy: ax88772a: fix lost pause advertisement configuration

From: Andrew Lunn
Date: Sun Jun 26 2022 - 04:58:52 EST


On Sat, Jun 25, 2022 at 09:17:31AM +0200, Lukas Wunner wrote:
> On Fri, Jun 24, 2022 at 09:55:58AM +0200, Oleksij Rempel wrote:
> > In case of asix_ax88772a_link_change_notify() workaround, we run soft
> > reset which will automatically clear MII_ADVERTISE configuration. The
> > PHYlib framework do not know about changed configuration state of the
> > PHY, so we need to save and restore all needed configuration registers.
> [...]
> > static void asix_ax88772a_link_change_notify(struct phy_device *phydev)
> > {
> > /* Reset PHY, otherwise MII_LPA will provide outdated information.
> > * This issue is reproducible only with some link partner PHYs
> > */
> > - if (phydev->state == PHY_NOLINK && phydev->drv->soft_reset)
> > + if (phydev->state == PHY_NOLINK && phydev->drv->soft_reset) {
> > + struct asix_context context;
> > +
> > + asix_context_save(phydev, &context);
> > +
> > phydev->drv->soft_reset(phydev);
> > +
> > + asix_context_restore(phydev, &context);
> > + }
> > }
>
> Hm, how about just calling phy_init_hw()? That will perform a
> ->soft_reset() and also restore the configuration, including
> interrupts (which the above does not, but I guess that's
> irrelevant as long as the driver uses polling).
>
> Does phy_init_hw() do too much or too little compared to the above
> and is hence not a viable solution?


at803x.c has:

/* After changing the smart speed settings, we need to perform a
* software reset, use phy_init_hw() to make sure we set the
* reapply any values which might got lost during software reset.
*/
if (ret == 1)
ret = phy_init_hw(phydev);

Andrew