linux-kernel - Re: [PATCH 5/9] tlan: Restart autonegotiation on link loss

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Message-ID: <CAGVrzcbD=OhzuWRuxJVG1SJeYDsOYaV2AozsWafBtX6gcF08vw@mail.gmail.com>
Date:	Tue, 27 May 2014 15:29:31 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Ondrej Zary <linux@...nbow-software.org>
Cc:	Samuel Chessman <chessman@....org>,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/9] tlan: Restart autonegotiation on link loss

Hi,

2014-05-27 14:38 GMT-07:00 Ondrej Zary <linux@...nbow-software.org>:
> When link is lost on a card which uses internal PHY for 10 Mbit speeds,
> restart autonegotiation to allow switching between 10 and 100 Mbps speeds.

I think you should take a look at implementing libphy read/write stubs
for this driver, that would allow you not to open-code such things.

>
> Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
> ---
>  drivers/net/ethernet/ti/tlan.c |   14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/drivers/net/ethernet/ti/tlan.c b/drivers/net/ethernet/ti/tlan.c
> index 31d4a96..1047b3f 100644
> --- a/drivers/net/ethernet/ti/tlan.c
> +++ b/drivers/net/ethernet/ti/tlan.c
> @@ -2721,6 +2721,7 @@ static void tlan_phy_finish_auto_neg(struct net_device *dev)
>         else if (!(mode & 0x0080) && (mode & 0x0040))
>                 priv->tlan_full_duplex = true;
>
> +       /* switch to internal PHY for 10 Mbps */
>         if ((!(mode & 0x0180)) &&
>             (priv->adapter->flags & TLAN_ADAPTER_USE_INTERN_10) &&
>             (priv->phy_num != 0)) {
> @@ -2788,6 +2789,19 @@ static void tlan_phy_monitor(unsigned long data)
>                                dev->name);
>                         tlan_dio_write8(dev->base_addr, TLAN_LED_REG, 0);
>                         netif_carrier_off(dev);
> +                       if (priv->adapter->flags & TLAN_ADAPTER_USE_INTERN_10) {
> +                               /* power down internal PHY */
> +                               u16 data = MII_GC_PDOWN | MII_GC_LOOPBK
> +                                       | MII_GC_ISOLATE;
> +                               tlan_mii_sync(dev->base_addr);
> +                               tlan_mii_write_reg(dev, priv->phy[0],
> +                                       MII_GEN_CTL, data);
> +                               /* set to external PHY */
> +                               priv->phy_num = 1;
> +                               /* restart autonegotiation */
> +                               tlan_set_timer(dev, (4*HZ/10), TLAN_TIMER_PHY_PDOWN);
> +                               return;
> +                       }
>                 }
>         }
>
> --
> Ondrej Zary
>
> --
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-- 
Florian
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