netdev - Re: [PATCH net-next v4] ravb: Add RZ/G2L MII interface support

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Date:   Wed, 14 Sep 2022 21:24:04 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>
Subject: Re: [PATCH net-next v4] ravb: Add RZ/G2L MII interface support

On 9/14/22 8:53 PM, Biju Das wrote:

> EMAC IP found on RZ/G2L Gb ethernet supports MII interface.
> This patch adds support for selecting MII interface mode.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> ---
> v3->v4:
>  * Dropped CXR35_HALFCYC_CLKSW1000 macro

   It's not macro...

>  * Added CXR35_HALFCYC_CLKSW, CXR35_SEL_XMII and CXR35_SEL_XMII_RGMII
>    macros.

   Neither are these...

> v2->v3:
>  * Documented CXR35_HALFCYC_CLKSW1000 and CXR35_SEL_XMII_MII macros.
> v1->v2:
>  * Fixed spaces->Tab around CXR35 description.
> ---
>  drivers/net/ethernet/renesas/ravb.h      | 8 ++++++++
>  drivers/net/ethernet/renesas/ravb_main.c | 8 +++++++-
>  2 files changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
> index b980bce763d3..b445da0fa578 100644
> --- a/drivers/net/ethernet/renesas/ravb.h
> +++ b/drivers/net/ethernet/renesas/ravb.h
[...]
> @@ -965,6 +966,13 @@ enum CXR31_BIT {
>  	CXR31_SEL_LINK1	= 0x00000008,
>  };
>  
> +enum CXR35_BIT {
> +	CXR35_HALFCYC_CLKSW	= 0xffff0000,

   Should come last...

[...]
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index b357ac4c56c5..421c8ff1ce1f 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -540,7 +540,13 @@ static void ravb_emac_init_gbeth(struct net_device *ndev)
>  	/* E-MAC interrupt enable register */
>  	ravb_write(ndev, ECSIPR_ICDIP, ECSIPR);
>  
> -	ravb_modify(ndev, CXR31, CXR31_SEL_LINK0 | CXR31_SEL_LINK1, CXR31_SEL_LINK0);
> +	if (priv->phy_interface == PHY_INTERFACE_MODE_MII) {
> +		ravb_modify(ndev, CXR31, CXR31_SEL_LINK0 | CXR31_SEL_LINK1, 0);
> +		ravb_write(ndev, (1000 << 16) | CXR35_SEL_XMII_MII, CXR35);
> +	} else {
> +		ravb_modify(ndev, CXR31, CXR31_SEL_LINK0 | CXR31_SEL_LINK1,
> +			    CXR31_SEL_LINK0);

   Hm... According to the RZ/G2LC manual, we still have to set CSR35.HALFCYC_CLKSW to
1000 even for RGMII... We probably need something more sophisticated here, like a flag
in the *struct* ravb_hw_info...

[...]

MBR, Sergey