netdev - Re: [PATCH 05/10] ravb: Initialize GbEthernet DMAC

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Date:   Mon, 4 Oct 2021 15:40:03 +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:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        "Adam Ford" <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Yuusuke Ashizuka <ashiduka@...itsu.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>,
        "Prabhakar Mahadev Lad" <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 05/10] ravb: Initialize GbEthernet DMAC

Hello!

On 10/1/21 6:06 PM, Biju Das wrote:

> Initialize GbEthernet DMAC found on RZ/G2L SoC.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> RFC->v1:
>  * Removed RIC3 initialization from DMAC init, as it is 
>    same as reset value.

   I'm not sure we do a reset everytime...

>  * moved stubs function to earlier patches.
>  * renamed "rgeth" with "gbeth"
> ---
>  drivers/net/ethernet/renesas/ravb.h      |  3 ++-
>  drivers/net/ethernet/renesas/ravb_main.c | 30 +++++++++++++++++++++++-
>  2 files changed, 31 insertions(+), 2 deletions(-)
> 
[...]
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index dc817b4d95a1..5790a9332e7b 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -489,7 +489,35 @@ static void ravb_emac_init(struct net_device *ndev)
>  
>  static int ravb_dmac_init_gbeth(struct net_device *ndev)
>  {
> -	/* Place holder */
> +	int error;
> +
> +	error = ravb_ring_init(ndev, RAVB_BE);
> +	if (error)
> +		return error;
> +
> +	/* Descriptor format */
> +	ravb_ring_format(ndev, RAVB_BE);
> +
> +	/* Set AVB RX */

   AVB? We don't have it, do we?

> +	ravb_write(ndev, 0x60000000, RCR);

   Not even RCR.EFFS? And what do bits 29..30 mean?

[...]
> +	/* Set FIFO size */
> +	ravb_write(ndev, 0x00222200, TGC);

   Do TBD<n> (other than TBD0) fields even exist?

[...]

MBR, Sergey