Subject: Re: [PATCH net 1/3] net: phy: realtek: add eee advertisement disable options

From: Jerome Brunet <jbrunet-rdvid1DuHRBWk0Htik3J/[email-masked]>
Date: Thu, 17 Nov 2016 11:20:55 +0100

On Wed, 2016-11-16 at 22:36 +0530, Anand Moon wrote:
>  Hi Jerome.
> 
> On 15 November 2016 at 19:59, Jerome Brunet <jbrunet-rdvid1DuHRBWk0Htik3J/[email-masked]>
> wrote:
> > 
> > On some platforms, energy efficient ethernet with rtl8211 devices
> > is
> > causing issue, like throughput drop or broken link.
> > 
> > This was reported on the OdroidC2 (DWMAC + RTL8211F). While the
> > issue root
> > cause is not fully understood yet, disabling EEE advertisement
> > prevent auto
> > negotiation from enabling EEE.
> > 
> > This patch provides options to disable 1000T and 100TX EEE
> > advertisement
> > individually for the realtek phys supporting this feature.
> > 
> > Reported-by: Martin Blumenstingl <martin.blumenstingl-gM/[email-masked]
> > m>
> > Cc: Giuseppe Cavallaro <[email-masked]>
> > Cc: Alexandre TORGUE <[email-masked]>
> > Signed-off-by: Jerome Brunet <jbrunet-rdvid1DuHRBWk0Htik3J/[email-masked]>
> > Signed-off-by: Neil Armstrong <narmstrong-rdvid1DuHRBWk0Htik3J/[email-masked]>
> > Tested-by: Andre Roth <[email-masked]>
> > ---
> >  drivers/net/phy/realtek.c | 65
> > ++++++++++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 64 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> > index aadd6e9f54ad..77235fd5faaf 100644
> > --- a/drivers/net/phy/realtek.c
> > +++ b/drivers/net/phy/realtek.c
> > @@ -15,6 +15,12 @@
> >   */
> >  #include <linux/phy.h>
> >  #include <linux/module.h>
> > +#include <linux/of.h>
> > +
> > +struct rtl8211x_phy_priv {
> > +       bool eee_1000t_disable;
> > +       bool eee_100tx_disable;
> > +};
> > 
> >  #define RTL821x_PHYSR          0x11
> >  #define RTL821x_PHYSR_DUPLEX   0x2000
> > @@ -93,12 +99,44 @@ static int rtl8211f_config_intr(struct
> > phy_device *phydev)
> >         return err;
> >  }
> > 
> > +static void rtl8211x_clear_eee_adv(struct phy_device *phydev)
> > +{
> > +       struct rtl8211x_phy_priv *priv = phydev->priv;
> > +       u16 val;
> > +
> > +       if (priv->eee_1000t_disable || priv->eee_100tx_disable) {
> > +               val = phy_read_mmd_indirect(phydev,
> > MDIO_AN_EEE_ADV,
> > +                                           MDIO_MMD_AN);
> > +
> > +               if (priv->eee_1000t_disable)
> > +                       val &= ~MDIO_AN_EEE_ADV_1000T;
> > +               if (priv->eee_100tx_disable)
> > +                       val &= ~MDIO_AN_EEE_ADV_100TX;
> > +
> > +               phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
> > +                                      MDIO_MMD_AN, val);
> > +       }
> > +}
> > +
> > +static int rtl8211x_config_init(struct phy_device *phydev)
> > +{
> > +       int ret;
> > +
> > +       ret = genphy_config_init(phydev);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       rtl8211x_clear_eee_adv(phydev);
> > +
> > +       return 0;
> > +}
> > +
> >  static int rtl8211f_config_init(struct phy_device *phydev)
> >  {
> >         int ret;
> >         u16 reg;
> > 
> > -       ret = genphy_config_init(phydev);
> > +       ret = rtl8211x_config_init(phydev);
> >         if (ret < 0)
> >                 return ret;
> > 
> > @@ -115,6 +153,26 @@ static int rtl8211f_config_init(struct
> > phy_device *phydev)
> >         return 0;
> >  }
> > 
> > +static int rtl8211x_phy_probe(struct phy_device *phydev)
> > +{
> > +       struct device *dev = &phydev->mdio.dev;
> > +       struct device_node *of_node = dev->of_node;
> > +       struct rtl8211x_phy_priv *priv;
> > +
> > +       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > +       if (!priv)
> > +               return -ENOMEM;
> > +
> > +       priv->eee_1000t_disable =
> > +               of_property_read_bool(of_node, "realtek,disable-
> > eee-1000t");
> > +       priv->eee_100tx_disable =
> > +               of_property_read_bool(of_node, "realtek,disable-
> > eee-100tx");
> > +
> > +       phydev->priv = priv;
> > +
> > +       return 0;
> > +}
> > +
> >  static struct phy_driver realtek_drvs[] = {
> >         {
> >                 .phy_id         = 0x00008201,
> > @@ -140,7 +198,9 @@ static struct phy_driver realtek_drvs[] = {
> >                 .phy_id_mask    = 0x001fffff,
> >                 .features       = PHY_GBIT_FEATURES,
> >                 .flags          = PHY_HAS_INTERRUPT,
> > +               .probe          = &rtl8211x_phy_probe,
> >                 .config_aneg    = genphy_config_aneg,
> > +               .config_init    = &rtl8211x_config_init,
> >                 .read_status    = genphy_read_status,
> >                 .ack_interrupt  = rtl821x_ack_interrupt,
> >                 .config_intr    = rtl8211e_config_intr,
> > @@ -152,7 +212,9 @@ static struct phy_driver realtek_drvs[] = {
> >                 .phy_id_mask    = 0x001fffff,
> >                 .features       = PHY_GBIT_FEATURES,
> >                 .flags          = PHY_HAS_INTERRUPT,
> > +               .probe          = &rtl8211x_phy_probe,
> >                 .config_aneg    = &genphy_config_aneg,
> > +               .config_init    = &rtl8211x_config_init,
> >                 .read_status    = &genphy_read_status,
> >                 .ack_interrupt  = &rtl821x_ack_interrupt,
> >                 .config_intr    = &rtl8211e_config_intr,
> > @@ -164,6 +226,7 @@ static struct phy_driver realtek_drvs[] = {
> >                 .phy_id_mask    = 0x001fffff,
> >                 .features       = PHY_GBIT_FEATURES,
> >                 .flags          = PHY_HAS_INTERRUPT,
> > +               .probe          = &rtl8211x_phy_probe,
> >                 .config_aneg    = &genphy_config_aneg,
> >                 .config_init    = &rtl8211f_config_init,
> >                 .read_status    = &genphy_read_status,
> > --
> > 2.7.4
> > 
> 
> How about adding callback functionality for .soft_reset to handle
> BMCR
> where we update the Auto-Negotiation for the phy,
> as per the datasheet of the rtl8211f.

I'm not sure I understand how this would help with our issue (and EEE).
Am I missing something or is it something unrelated that you would like
to see happening on this driver ? 

> 
> -Best Regard
> Anand Moon
> 
> > 
> > 
> > _______________________________________________
> > linux-amlogic mailing list
> > [email-masked]
> > http://lists.infradead.org/mailman/listinfo/linux-amlogic
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