netdev - Re: [RFC/PATCH 09/18] ravb: Add half_duplex to struct ravb_hw

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Date:   Fri, 24 Sep 2021 23:07:33 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Andrew Lunn <andrew@...n.ch>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "Geert Uytterhoeven" <geert+renesas@...der.be>,
        Adam Ford <aford173@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>
Subject: Re: [RFC/PATCH 09/18] ravb: Add half_duplex to struct ravb_hw_info

On 9/23/21 5:08 PM, Biju Das wrote:

> RZ/G2L supports half duplex mode.
> Add a half_duplex hw feature bit to struct ravb_hw_info for
> supporting half duplex mode for RZ/G2L.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
[...]

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

   Just a little bit of change needed...

[...]
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 5d18681582b9..04bff44b7660 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -1076,6 +1076,18 @@ static int ravb_poll(struct napi_struct *napi, int budget)
>  	return budget - quota;
>  }
>  
> +static void ravb_set_duplex_rgeth(struct net_device *ndev)
> +{
> +	struct ravb_private *priv = netdev_priv(ndev);
> +	u32 ecmr = ravb_read(ndev, ECMR);
> +
> +	if (priv->duplex > 0)	/* Full */
> +		ecmr |=  ECMR_DM;
> +	else			/* Half */
> +		ecmr &= ~ECMR_DM;
> +	ravb_write(ndev, ecmr, ECMR);

   I think we should do that like sh_eth.c:

	ravb_modify(ndev, ECMR, ECMR_DM, priv->duplex > 0 ? ECMR_DM : 0);

[...]

MBR, Sergey