netdev - RE: [PATCH 10/10] ravb: Initialize GbEthernet E-MAC

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Date:   Mon, 4 Oct 2021 19:33:40 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Sergey Shtylyov <s.shtylyov@....ru>,
        "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" <netdev@...r.kernel.org>,
        "linux-renesas-soc@...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 10/10] ravb: Initialize GbEthernet E-MAC



> -----Original Message-----
> From: Sergey Shtylyov <s.shtylyov@....ru>
> Sent: 04 October 2021 20:28
> 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 10/10] ravb: Initialize GbEthernet E-MAC
> 
> On 10/4/21 10:23 PM, Biju Das wrote:
> 
> [...]
> >>> Initialize GbEthernet E-MAC found on RZ/G2L SoC.
> >>> This patch also renames ravb_set_rate to ravb_set_rate_rcar and
> >>> ravb_rcar_emac_init to ravb_emac_init_rcar to be consistent with the
> >>> naming convention used in sh_eth driver.
> >>>
> >>> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> >>> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >>> ---
> >>> RFC->v1:
> >>>  * Moved CSR0 intialization to later patch.
> >>>  * started using ravb_modify for initializing link registers.
> >>> ---
> >>>  drivers/net/ethernet/renesas/ravb.h      | 20 +++++++--
> >>>  drivers/net/ethernet/renesas/ravb_main.c | 55
> >>> ++++++++++++++++++++----
> >>>  2 files changed, 62 insertions(+), 13 deletions(-)
> >>>
> [...]
> >>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c
> >>> b/drivers/net/ethernet/renesas/ravb_main.c
> >>> index 3e694738e683..9a4888543384 100644
> >>> --- a/drivers/net/ethernet/renesas/ravb_main.c
> >>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> >> [...]
> >>> @@ -449,10 +461,35 @@ static int ravb_ring_init(struct net_device
> >>> *ndev, int q)
> >>>
> >>>  static void ravb_emac_init_gbeth(struct net_device *ndev)  {
> >>> -	/* Place holder */
> >>> +	struct ravb_private *priv = netdev_priv(ndev);
> >>> +
> >>> +	/* Receive frame limit set register */
> >>> +	ravb_write(ndev, GBETH_RX_BUFF_MAX + ETH_FCS_LEN, RFLR);
> >>> +
> >>> +	/* PAUSE prohibition */
> >>
> >>     Should be:
> >>
> >> 	/* EMAC Mode: PAUSE prohibition; Duplex; TX; RX */

Why do we need ";" in between? Just checking or ":" is sufficient throughout?

> >>
> >>> +	ravb_write(ndev, ECMR_ZPF | ((priv->duplex > 0) ? ECMR_DM : 0) |
> >>> +			 ECMR_TE | ECMR_RE | ECMR_RCPT |
> >>> +			 ECMR_TXF | ECMR_RXF | ECMR_PRM, ECMR);
> >>> +
> >>> +	ravb_set_rate_gbeth(ndev);
> >>> +
> >>> +	/* Set MAC address */
> >>> +	ravb_write(ndev,
> >>> +		   (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) |
> >>> +		   (ndev->dev_addr[2] << 8)  | (ndev->dev_addr[3]), MAHR);
> >>> +	ravb_write(ndev, (ndev->dev_addr[4] << 8)  | (ndev->dev_addr[5]),
> >>> +MALR);
> >>> +
> >>> +	/* E-MAC status register clear */
> >>> +	ravb_write(ndev, ECSR_ICD | ECSR_LCHNG | ECSR_PFRI, ECSR);
> >>> +
> >>> +	/* E-MAC interrupt enable register */
> >>> +	ravb_write(ndev, ECSIPR_ICDIP, ECSIPR);
> >>
> >>    Too much repetitive code, I think...
> >
> > Can you please clarify what are the codes repetitive here?
> 
>    MAHR/MALR reading, mainly...
>    The following code turned out to be different from gen2/3 indeed...

It is OK. Only for just saving 2 writes we don't need to introduce a new function.

Regards,
Biju



> 
> [...]
> 
> MBR, Sergey