netdev - Re: [PATCH net-next] net: pcs: Enable pre-emption packet for 10/100Mbps

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Date:   Thu, 22 Apr 2021 11:16:11 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     mohammad.athari.ismail@...el.com
Cc:     Jose Abreu <joabreu@...opsys.com>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Voon Weifeng <weifeng.voon@...el.com>, vee.khee.wong@...el.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: pcs: Enable pre-emption packet for
 10/100Mbps

On Thu, Apr 22, 2021 at 03:48:51PM +0800, mohammad.athari.ismail@...el.com wrote:
> From: Mohammad Athari Bin Ismail <mohammad.athari.ismail@...el.com>
> 
> Set VR_MII_DIG_CTRL1 bit-6(PRE_EMP) to enable pre-emption packet for
> 10/100Mbps by default. This setting doesn`t impact pre-emption
> capability for other speeds.
> 
> Signed-off-by: Mohammad Athari Bin Ismail <mohammad.athari.ismail@...el.com>
> ---
>  drivers/net/pcs/pcs-xpcs.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
> index 944ba105cac1..2dbc1d46821e 100644
> --- a/drivers/net/pcs/pcs-xpcs.c
> +++ b/drivers/net/pcs/pcs-xpcs.c
> @@ -66,6 +66,7 @@
>  
>  /* VR_MII_DIG_CTRL1 */
>  #define DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW		BIT(9)
> +#define DW_VR_MII_DIG_CTRL1_PRE_EMP		BIT(6)
>  
>  /* VR_MII_AN_CTRL */
>  #define DW_VR_MII_AN_CTRL_TX_CONFIG_SHIFT	3
> @@ -666,6 +667,10 @@ static int xpcs_config_aneg_c37_sgmii(struct mdio_xpcs_args *xpcs)
>  	 *	 PHY about the link state change after C28 AN is completed
>  	 *	 between PHY and Link Partner. There is also no need to
>  	 *	 trigger AN restart for MAC-side SGMII.
> +	 *
> +	 * For pre-emption, the setting is :-
> +	 * 1) VR_MII_DIG_CTRL1 Bit(6) [PRE_EMP] = 1b (Enable pre-emption packet
> +	 *    for 10/100Mbps)
>  	 */
>  	ret = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_AN_CTRL);
>  	if (ret < 0)
> @@ -686,7 +691,7 @@ static int xpcs_config_aneg_c37_sgmii(struct mdio_xpcs_args *xpcs)
>  	if (ret < 0)
>  		return ret;
>  
> -	ret |= DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW;
> +	ret |= (DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW | DW_VR_MII_DIG_CTRL1_PRE_EMP);

() are useless here.

Thanks

>  
>  	return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL1, ret);
>  }
> -- 
> 2.17.1
>