netdev - Re: [PATCH v3 6/6] can: rcar_canfd: Add has_gerfl_eef to struct rcar_canfd_hw

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Date:   Fri, 28 Oct 2022 12:12:22 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     biju.das.jz@...renesas.com
Cc:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Stefan Mätje <stefan.maetje@....eu>,
        Ulrich Hecht <uli+renesas@...nd.eu>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v3 6/6] can: rcar_canfd: Add has_gerfl_eef to struct rcar_canfd_hw_info

Hi Biju,

On Thu, Oct 27, 2022 at 10:22 AM Biju Das <biju.das.jz@...renesas.com> wrote:
> R-Car has ECC error flags in global error interrupts whereas it is
> not available on RZ/G2L.
>
> Add has_gerfl_eef to struct rcar_canfd_hw_info so that rcar_canfd_
> global_error() will process ECC errors only for R-Car.
>
> whilst, this patch fixes the below checkpatch warnings
>   CHECK: Unnecessary parentheses around 'ch == 0'
>   CHECK: Unnecessary parentheses around 'ch == 1'
>
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

> --- a/drivers/net/can/rcar/rcar_canfd.c
> +++ b/drivers/net/can/rcar/rcar_canfd.c
> @@ -955,13 +958,15 @@ static void rcar_canfd_global_error(struct net_device *ndev)
>         u32 ridx = ch + RCANFD_RFFIFO_IDX;
>
>         gerfl = rcar_canfd_read(priv->base, RCANFD_GERFL);
> -       if ((gerfl & RCANFD_GERFL_EEF0) && (ch == 0)) {
> -               netdev_dbg(ndev, "Ch0: ECC Error flag\n");
> -               stats->tx_dropped++;
> -       }
> -       if ((gerfl & RCANFD_GERFL_EEF1) && (ch == 1)) {
> -               netdev_dbg(ndev, "Ch1: ECC Error flag\n");
> -               stats->tx_dropped++;
> +       if (gpriv->info->has_gerfl_eef) {
> +               if ((gerfl & RCANFD_GERFL_EEF0) && ch == 0) {
> +                       netdev_dbg(ndev, "Ch0: ECC Error flag\n");
> +                       stats->tx_dropped++;
> +               }
> +               if ((gerfl & RCANFD_GERFL_EEF1) && ch == 1) {
> +                       netdev_dbg(ndev, "Ch1: ECC Error flag\n");
> +                       stats->tx_dropped++;
> +               }

BTW, this fails to check the ECC error flags for channels 2-7 on R-Car
V3U, which is a pre-existing problem.  As that is a bug, I have sent
a fix[1], which unfortunately conflicts with your patch. Sorry for that.

>         }
>         if (gerfl & RCANFD_GERFL_MES) {
>                 sts = rcar_canfd_read(priv->base,

[1] "[PATCH] can: rcar_canfd: Add missing ECC error checks for channels 2-7"
    https://lore.kernel.org/r/4edb2ea46cc64d0532a08a924179827481e14b4f.1666951503.git.geert+renesas@glider.be

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds