linux-kernel - Re: [PATCH net-next 2/2] net: pcs: xpcs: fix incorrect CL37 AN sequence

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Date:   Wed, 29 Sep 2021 19:46:31 +0800
From:   Wong Vee Khee <vee.khee.wong@...ux.intel.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Andrew Lunn <andrew@...n.ch>, Jose Abreu <Jose.Abreu@...opsys.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Wong Vee Khee <veekhee@...il.com>
Subject: Re: [PATCH net-next 2/2] net: pcs: xpcs: fix incorrect CL37 AN
 sequence

On Tue, Sep 28, 2021 at 10:41:04AM +0000, Vladimir Oltean wrote:
> On Tue, Sep 28, 2021 at 12:19:38PM +0800, Wong Vee Khee wrote:
> > According to Synopsys DesignWare Cores Ethernet PCS databook, it is
> > required to disable Clause 37 auto-negotiation by programming bit-12
> > (AN_ENABLE) to 0 if it is already enabled, before programming various
> > fields of VR_MII_AN_CTRL registers.
> > 
> > After all these programming are done, it is then required to enable
> > Clause 37 auto-negotiation by programming bit-12 (AN_ENABLE) to 1.
> > 
> > Cc: Vladimir Oltean <vladimir.oltean@....com>
> > Signed-off-by: Wong Vee Khee <vee.khee.wong@...ux.intel.com>
> > ---
> 
> Other comments:
> 
> - please provide a Fixes: tag, like:
> 
> Fixes: b97b5331b8ab ("net: pcs: add C37 SGMII AN support for intel mGbE controller")
> 
> (just like that, not split on multiple lines)
> 
> - please target the patches to the "net" tree. I see the xpcs_modify
>   patch has other stuff in its context (nxp_sja1105) that will conflict
>   with the tree in which the bad commit was originally introduced, so I
>   think the easiest way would be if you could just open-code the initial
>   clearing of bit MDIO_AN_CTRL1_ENABLE. You could then wait until "net"
>   merges with "net-next" again and do the other cleanups afterwards - it
>   looks like other places could use a _modify method as well, just
>   looking at DW_VR_MII_AN_CTRL, DW_VR_MII_DIG_CTRL1. Also, the complete
>   replacement of DW_VR_MII_MMD_CTRL with MDIO_CTRL1 can also be done in
>   net-next. Just try to keep the fix minimally self-contained.

Sure! will mark this target for 'net' for v2.