linux-kernel - Re: [PATCH net-next 15/30] net: dsa: mt7530: set TRGMII RD TAP if trgmii is being used

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Message-ID: <20230526130925.g6w3tbxunoamfmha@skbuf>
Date:   Fri, 26 May 2023 16:09:25 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     arinc9.unal@...il.com
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Russell King <linux@...linux.org.uk>,
        Arınç ÜNAL <arinc.unal@...nc9.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        erkin.bozoglu@...ont.com, mithat.guner@...ont.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 15/30] net: dsa: mt7530: set TRGMII RD TAP if
 trgmii is being used

On Mon, May 22, 2023 at 03:15:17PM +0300, arinc9.unal@...il.com wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> This code sets the Read Data (RD) TAP value to 16 for all TRGMII control
> registers.
> 
> The for loop iterates over all the TRGMII control registers, and
> mt7530_rmw() function is used to perform a read-modify-write operation on
> each register's RD_TAP field to set its value to 16.
> 
> This operation is used to tune the timing of the read data signal in
> TRGMII to match the TX signal of the link partner.
> 
> Run this if trgmii is being used. Since this code doesn't lower the
> driving, there's no apparent benefit to run this if trgmii is not being
> used.
> 
> Add a comment to explain the code.
> 
> Thanks to 趙皎宏 (Landen Chao) for pointing out what the code does.
> 
> Tested-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>