netdev - RE: [PATCH net-next v2 7/8] ravb: Add internal delay hw feature to struct ravb_hw

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Date:   Wed, 4 Aug 2021 10:32:24 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     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 net-next v2 7/8] ravb: Add internal delay hw feature to
 struct ravb_hw_info

Hi Sergei,

> Subject: Re: [PATCH net-next v2 7/8] ravb: Add internal delay hw feature
> to struct ravb_hw_info
> 
> On 04.08.2021 8:13, Biju Das wrote:
> 
> [...]
> >>> R-Car Gen3 supports TX and RX clock internal delay modes, whereas
> >>> R-Car
> >>> Gen2 and RZ/G2L do not support it.
> >>> Add an internal_delay hw feature bit to struct ravb_hw_info to
> >>> enable this only for R-Car Gen3.
> >>>
> >>> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> >>> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >>> ---
> >>> v2:
> >>>   * Incorporated Andrew and Sergei's review comments for making it
> >> smaller patch
> >>>     and provided detailed description.
> >>> ---
> >>>   drivers/net/ethernet/renesas/ravb.h      | 3 +++
> >>>   drivers/net/ethernet/renesas/ravb_main.c | 6 ++++--
> >>>   2 files changed, 7 insertions(+), 2 deletions(-)
> >>>
> >>> diff --git a/drivers/net/ethernet/renesas/ravb.h
> >>> b/drivers/net/ethernet/renesas/ravb.h
> >>> index 3df813b2e253..0d640dbe1eed 100644
> >>> --- a/drivers/net/ethernet/renesas/ravb.h
> >>> +++ b/drivers/net/ethernet/renesas/ravb.h
> >>> @@ -998,6 +998,9 @@ struct ravb_hw_info {
> >>>   	int num_tx_desc;
> >>>   	int stats_len;
> >>>   	size_t skb_sz;
> >>> +
> >>> +	/* hardware features */
> >>> +	unsigned internal_delay:1;	/* RAVB has internal delays */
> >>
> >>     Oops, missed it initially:
> >>     RAVB? That's not a device name, according to the manuals. It
> >> seems to be the driver's name.
> >
> > OK. will change it to AVB-DMAC has internal delays.
> 
>     Please don't -- E-MAC has them, not AVB-DMAC.

Since the register for setting internal delay mode is coming from product specific register(0x8c),
I am agreeing with your statement, "E-MAC has internal delays".

Cheers,
Biju