linux-kernel - Re: [PATCH net-next v2 3/5] net: mediatek: sgmii: mtk_pcs_setup_mode

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Message-ID: <YyhSnqacAE4ajRdy@shell.armlinux.org.uk>
Date:   Mon, 19 Sep 2022 12:29:34 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Alexander Couzens <lynxis@...0.eu>
Cc:     Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.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>,
        Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 3/5] net: mediatek: sgmii:
 mtk_pcs_setup_mode_an: don't rely on register defaults

On Mon, Sep 19, 2022 at 10:37:10AM +0200, Alexander Couzens wrote:
> Ensure autonegotiation is enabled.
> 
> Signed-off-by: Alexander Couzens <lynxis@...0.eu>
> ---
>  drivers/net/ethernet/mediatek/mtk_sgmii.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_sgmii.c b/drivers/net/ethernet/mediatek/mtk_sgmii.c
> index 18de85709e87..6f4c1ca5a36f 100644
> --- a/drivers/net/ethernet/mediatek/mtk_sgmii.c
> +++ b/drivers/net/ethernet/mediatek/mtk_sgmii.c
> @@ -32,12 +32,13 @@ static int mtk_pcs_setup_mode_an(struct mtk_pcs *mpcs)
>  	regmap_write(mpcs->regmap, SGMSYS_PCS_LINK_TIMER,
>  		     SGMII_LINK_TIMER_DEFAULT);
>  
> +	/* disable remote fault & enable auto neg */
>  	regmap_read(mpcs->regmap, SGMSYS_SGMII_MODE, &val);
> -	val |= SGMII_REMOTE_FAULT_DIS;
> +	val |= SGMII_REMOTE_FAULT_DIS | SGMII_SPEED_DUPLEX_AN;
>  	regmap_write(mpcs->regmap, SGMSYS_SGMII_MODE, val);
>  
>  	regmap_read(mpcs->regmap, SGMSYS_PCS_CONTROL_1, &val);
> -	val |= SGMII_AN_RESTART;
> +	val |= SGMII_AN_RESTART | SGMII_AN_ENABLE;

I'm not sure if I've asked this before, but why does SGMII_AN_RESTART
need to be set here? It could do with a comment in the code.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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