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 10:22:43 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "netdev@...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" 
        <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 Geert,

> 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"

OK. I will rebase with this patch.

Cheers,
Biju