linux-kernel - Re: [EXT] Re: [PATCH v13 net-next 05/15] net: mvpp2: add PPv23 version definition

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Date:   Thu, 11 Feb 2021 20:26:10 +0100
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Stefan Chulski <stefanc@...vell.com>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Nadav Haklai <nadavh@...vell.com>,
        Yan Markman <ymarkman@...vell.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "atenart@...nel.org" <atenart@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [EXT] Re: [PATCH v13 net-next 05/15] net: mvpp2: add PPv23
 version definition

czw., 11 lut 2021 o 12:49 Stefan Chulski <stefanc@...vell.com> napisał(a):
>
> > ----------------------------------------------------------------------
> > On Thu, Feb 11, 2021 at 12:48:52PM +0200, stefanc@...vell.com wrote:
> > > From: Stefan Chulski <stefanc@...vell.com>
> > >
> > > This patch add PPv23 version definition.
> > > PPv23 is new packet processor in CP115.
> > > Everything that supported by PPv22, also supported by PPv23.
> > > No functional changes in this stage.
> > >
> > > Signed-off-by: Stefan Chulski <stefanc@...vell.com>
> > > Acked-by: Marcin Wojtas <mw@...ihalf.com>
> >
> > Reviewed-by: Russell King <rmk+kernel@...linux.org.uk>
> >
> > > @@ -7049,6 +7049,11 @@ static int mvpp2_probe(struct platform_device
> > *pdev)
> > >                     priv->port_map |= BIT(i);
> > >     }
> > >
> > > +   if (priv->hw_version != MVPP21) {
> > > +           if (mvpp2_read(priv, MVPP2_VER_ID_REG) ==
> > MVPP2_VER_PP23)
> > > +                   priv->hw_version = MVPP23;
> > > +   }
> > > +
> >
> > The only minor comment I have on this is... the formatting of the above.
> > Wouldn't:
> >
> >       if (priv->hw_version >= MVPP22 &&
> >           mvpp2_read(priv, MVPP2_VER_ID_REG) == MVPP2_VER_PP23)
> >               priv->hw_version = MVPP23;
> >
> > read better?
> >
> > Do we need to even check priv->hw_version here? Isn't this register
> > implemented in PPv2.1 where it contains the value zero?
>
> Yes, we can just:
>         if (mvpp2_read(priv, MVPP2_VER_ID_REG) == MVPP2_VER_PP23)
>                 priv->hw_version = MVPP23;
>
>

I checked the A375 specs and cannot see this particular register. Can
you please double check whether this register is in the old version of
the IP and the Functional Spec is incomplete?

Thanks,
Marcin