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

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Message-ID: <CO6PR18MB38739CA874F3748919C8361CB08C9@CO6PR18MB3873.namprd18.prod.outlook.com>
Date:   Thu, 11 Feb 2021 11:49:25 +0000
From:   Stefan Chulski <stefanc@...vell.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
CC:     "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>,
        "mw@...ihalf.com" <mw@...ihalf.com>,
        "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

> ----------------------------------------------------------------------
> 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;

Thanks,
Stefan.