linux-kernel - Re: [PATCH v3] net: netsec: Ignore 'phy-mode' on SynQuacer in DT mode

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Message-ID: <CAMj1kXF_AZ9bFWHPjDURkZUdAdrX0Qh2Q03FNYq99pfrJGtFjQ@mail.gmail.com>
Date:   Mon, 31 Jul 2023 12:54:03 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Jassi Brar <jaswinder.singh@...aro.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] net: netsec: Ignore 'phy-mode' on SynQuacer in DT mode

On Mon, 31 Jul 2023 at 12:48, Mark Brown <broonie@...nel.org> wrote:
>
> As documented in acd7aaf51b20 ("netsec: ignore 'phy-mode' device
> property on ACPI systems") the SocioNext SynQuacer platform ships with
> firmware defining the PHY mode as RGMII even though the physical
> configuration of the PHY is for TX and RX delays.  Since bbc4d71d63549bc
> ("net: phy: realtek: fix rtl8211e rx/tx delay config") this has caused
> misconfiguration of the PHY, rendering the network unusable.
>
> This was worked around for ACPI by ignoring the phy-mode property but
> the system is also used with DT.  For DT instead if we're running on a
> SynQuacer force a working PHY mode, as well as the standard EDK2
> firmware with DT there are also some of these systems that use u-boot
> and might not initialise the PHY if not netbooting.  Newer firmware
> imagaes for at least EDK2 are available from Linaro so print a warning
> when doing this.
>
> Fixes: 533dd11a12f6 ("net: socionext: Add Synquacer NetSec driver")
> Signed-off-by: Mark Brown <broonie@...nel.org>

Acked-by: Ard Biesheuvel <ardb@...nel.org>

> ---
> Changes in v3:
> - Typo fixes.
> - Link to v2: https://lore.kernel.org/r/20230728-synquacer-net-v2-1-aea4d4f32b26@kernel.org
>
> Changes in v2:
> - Unlike ACPI force what appears to be the correct mode, there are
>   u-boot firmwares which might not configure the PHY.
> - Link to v1: https://lore.kernel.org/r/20230727-synquacer-net-v1-1-4d7f5c4cc8d9@kernel.org
> ---
>  drivers/net/ethernet/socionext/netsec.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/net/ethernet/socionext/netsec.c b/drivers/net/ethernet/socionext/netsec.c
> index 2d7347b71c41..0dcd6a568b06 100644
> --- a/drivers/net/ethernet/socionext/netsec.c
> +++ b/drivers/net/ethernet/socionext/netsec.c
> @@ -1851,6 +1851,17 @@ static int netsec_of_probe(struct platform_device *pdev,
>                 return err;
>         }
>
> +       /*
> +        * SynQuacer is physically configured with TX and RX delays
> +        * but the standard firmware claimed otherwise for a long
> +        * time, ignore it.
> +        */
> +       if (of_machine_is_compatible("socionext,developer-box") &&
> +           priv->phy_interface != PHY_INTERFACE_MODE_RGMII_ID) {
> +               dev_warn(&pdev->dev, "Outdated firmware reports incorrect PHY mode, overriding\n");
> +               priv->phy_interface = PHY_INTERFACE_MODE_RGMII_ID;
> +       }
> +
>         priv->phy_np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
>         if (!priv->phy_np) {
>                 dev_err(&pdev->dev, "missing required property 'phy-handle'\n");
>
> ---
> base-commit: 5d0c230f1de8c7515b6567d9afba1f196fb4e2f4
> change-id: 20230727-synquacer-net-e241f34baceb
>
> Best regards,
> --
> Mark Brown <broonie@...nel.org>
>