linux-kernel - Re: [PATCH net v1 1/1] net: stmmac: fix EEE init issue when paired with EEE capable PHYs

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Date:   Tue, 5 Oct 2021 19:15:56 +0800
From:   Wong Vee Khee <vee.khee.wong@...ux.intel.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
        Wong Vee Khee <veekhee@...il.com>
Subject: Re: [PATCH net v1 1/1] net: stmmac: fix EEE init issue when paired
 with EEE capable PHYs

On Fri, Oct 01, 2021 at 01:31:36AM +0200, Andrew Lunn wrote:
> On Thu, Sep 30, 2021 at 02:44:36PM +0800, Wong Vee Khee wrote:
> > When STMMAC is paired with Energy-Efficient Ethernet(EEE) capable PHY,
> > and the PHY is advertising EEE by default, we need to enable EEE on the
> > xPCS side too, instead of having user to manually trigger the enabling
> > config via ethtool.
> > 
> > Fixed this by adding xpcs_config_eee() call in stmmac_eee_init().
> > 
> > Fixes: 7617af3d1a5e ("net: pcs: Introducing support for DWC xpcs Energy Efficient Ethernet")
> > Cc: Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>
> > Signed-off-by: Wong Vee Khee <vee.khee.wong@...ux.intel.com>
> > ---
> >  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > index 553c4403258a..981ccf47dcea 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > @@ -486,6 +486,10 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
> >  		timer_setup(&priv->eee_ctrl_timer, stmmac_eee_ctrl_timer, 0);
> >  		stmmac_set_eee_timer(priv, priv->hw, STMMAC_DEFAULT_LIT_LS,
> >  				     eee_tw_timer);
> > +		if (priv->hw->xpcs)
> > +			xpcs_config_eee(priv->hw->xpcs,
> > +					priv->plat->mult_fact_100ns,
> > +					true);
> >  	}
> 
> 
>        /* Check if it needs to be deactivated */
>         if (!priv->eee_active) {
>                 if (priv->eee_enabled) {
>                         netdev_dbg(priv->dev, "disable EEE\n");
>                         stmmac_lpi_entry_timer_config(priv, 0);
>                         del_timer_sync(&priv->eee_ctrl_timer);
>                         stmmac_set_eee_timer(priv, priv->hw, 0, eee_tw_timer);
>                 }
>                 mutex_unlock(&priv->lock);
>                 return false;
>         }
> 
> Don't you want to turn it of in here?
> 
>       Andrew

You're right.

Will introduce a new patch for that.

Regards,
Vee Khee