linux-kernel - Re: [PATCH net v3] net: mvpp2: disable force link UP during port init procedure

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Date:   Fri, 18 Dec 2020 04:36:18 +0100
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Stefan Chulski <stefanc@...vell.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>, nadavh@...vell.com,
        Yan Markman <ymarkman@...vell.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH net v3] net: mvpp2: disable force link UP during port init procedure

Hi Stefan,

czw., 17 gru 2020 o 15:54 <stefanc@...vell.com> napisał(a):
>
> From: Stefan Chulski <stefanc@...vell.com>
>
> Force link UP can be enabled by bootloader during tftpboot
> and breaks NFS support.
> Force link UP disabled during port init procedure.
>
> Fixes: f84bf386f395 ("net: mvpp2: initialize the GoP")
> Signed-off-by: Stefan Chulski <stefanc@...vell.com>
> ---
>
> Changes in v3:
> - Added Fixes tag.
> Changes in v2:
> - No changes.
>
>  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> index d2b0506..0ad3177 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> @@ -5479,7 +5479,7 @@ static int mvpp2_port_init(struct mvpp2_port *port)
>         struct mvpp2 *priv = port->priv;
>         struct mvpp2_txq_pcpu *txq_pcpu;
>         unsigned int thread;
> -       int queue, err;
> +       int queue, err, val;
>
>         /* Checks for hardware constraints */
>         if (port->first_rxq + port->nrxqs >
> @@ -5493,6 +5493,18 @@ static int mvpp2_port_init(struct mvpp2_port *port)
>         mvpp2_egress_disable(port);
>         mvpp2_port_disable(port);
>
> +       if (mvpp2_is_xlg(port->phy_interface)) {
> +               val = readl(port->base + MVPP22_XLG_CTRL0_REG);
> +               val &= ~MVPP22_XLG_CTRL0_FORCE_LINK_PASS;
> +               val |= MVPP22_XLG_CTRL0_FORCE_LINK_DOWN;
> +               writel(val, port->base + MVPP22_XLG_CTRL0_REG);
> +       } else {
> +               val = readl(port->base + MVPP2_GMAC_AUTONEG_CONFIG);
> +               val &= ~MVPP2_GMAC_FORCE_LINK_PASS;
> +               val |= MVPP2_GMAC_FORCE_LINK_DOWN;
> +               writel(val, port->base + MVPP2_GMAC_AUTONEG_CONFIG);
> +       }
> +
>         port->tx_time_coal = MVPP2_TXDONE_COAL_USEC;
>
>         port->txqs = devm_kcalloc(dev, port->ntxqs, sizeof(*port->txqs),
> --

I confirm the patch fixes issue - tested on CN913x-DB and RGMII port.
Other boards there I see no regression.

Acked-by: Marcin Wojtas <mw@...ihalf.com>

Thanks,
Marcin