linux-kernel - Re: [PATCH net v4 1/1] net: pcs: xpcs: fix incorrect CL37 AN sequence

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Date:   Tue, 5 Oct 2021 12:07:29 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Wong Vee Khee <vee.khee.wong@...ux.intel.com>
CC:     "David S . Miller" <davem@...emloft.net>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        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 v4 1/1] net: pcs: xpcs: fix incorrect CL37 AN sequence

On Tue, Oct 05, 2021 at 11:45:21AM +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.
> 
> Fixes: b97b5331b8ab ("net: pcs: add C37 SGMII AN support for intel mGbE controller")
> Cc: Vladimir Oltean <vladimir.oltean@....com>
> Signed-off-by: Wong Vee Khee <vee.khee.wong@...ux.intel.com>
> ---

Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
Tested-by: Vladimir Oltean <vladimir.oltean@....com>

> v3 -> v4:
>  - Removed redunctant 'changed' variable.

s/redunctant/redundant/

> v2 -> v3:
>  - Added error handling after xpcs_write().
>  - Added 'changed' flag.
>  - Added fixes tag.
> v1 -> v2:
>  - Removed use of xpcs_modify() helper function.
>  - Add conditional check on inband auto-negotiation.
> ---