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From: Sergei Shtylyov <sergei.shtylyov@gmail.com>
To: Biju Das <biju.das.jz@bp.renesas.com>,
	Sergey Shtylyov <s.shtylyov@omp.ru>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>,
	Sergey Shtylyov <s.shtylyov@omprussia.ru>,
	Adam Ford <aford173@gmail.com>, Andrew Lunn <andrew@lunn.ch>,
	Yuusuke Ashizuka <ashiduka@fujitsu.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-renesas-soc@vger.kernel.org" 
	<linux-renesas-soc@vger.kernel.org>,
	Chris Paterson <Chris.Paterson2@renesas.com>,
	Biju Das <biju.das@bp.renesas.com>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>
Subject: Re: [PATCH net-next v2 7/8] ravb: Add internal delay hw feature to struct ravb_hw_info
Date: Wed, 4 Aug 2021 13:34:06 +0300	[thread overview]
Message-ID: <bdfeb1c1-98bf-25ed-a4db-6ca3c5abc099@gmail.com> (raw)
In-Reply-To: <OS0PR01MB5922F0ACBC41881139B3C03E86F19@OS0PR01MB5922.jpnprd01.prod.outlook.com>

On 04.08.2021 13:08, Biju Das wrote:
> Hi Sergei,
> 
> Thanks for feedback
> 
>> 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:
>>> Hi Sergei,
>>>
>>> Thanks for the feedback
>>>
>>>> Subject: Re: [PATCH net-next v2 7/8] ravb: Add internal delay hw
>>>> feature to struct ravb_hw_info
>>>>
>>>> On 8/2/21 1:26 PM, 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@bp.renesas.com>
>>>>> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.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.
> 
> By looking at HW manual for R-Car AVB-DMAC (APSR register, offset:-0x08C) has TDM and RDM registers for Setting internal delay mode which can give TX clock delay up to 2.0ns and RX Clock delay 2.8ns.
> 
> Please correct me, if this is not the case.

    You're correct indeed -- though being counter-intuitive, APSR belongs to 
the AVB-DMAC block. Sorry about that. :-/

>  Regards,
> Biju

NBR, Sergei

  reply	other threads:[~2021-08-04 10:34 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 10:26 [PATCH net-next v2 0/8] Add Gigabit Ethernet driver support Biju Das
2021-08-02 10:26 ` [PATCH net-next v2 1/8] ravb: Add struct ravb_hw_info to driver data Biju Das
2021-08-02 15:02   ` Andrew Lunn
2021-08-02 20:42   ` Sergei Shtylyov
2021-08-03  5:57     ` Biju Das
2021-08-03  6:36       ` Biju Das
2021-08-04 19:27       ` Sergei Shtylyov
2021-08-04 20:27         ` Sergei Shtylyov
2021-08-09 12:06   ` Geert Uytterhoeven
2021-08-12  7:26     ` Biju Das
2021-08-12  7:58       ` Geert Uytterhoeven
2021-08-12  8:13         ` Biju Das
2021-08-17 11:24           ` Biju Das
2021-08-17 20:11             ` Sergey Shtylyov
2021-08-18  6:29               ` Biju Das
2021-08-18 10:11                 ` Sergey Shtylyov
2021-08-18 10:23                   ` Biju Das
2021-08-02 10:26 ` [PATCH net-next v2 2/8] ravb: Add skb_sz to struct ravb_hw_info Biju Das
2021-08-02 15:08   ` Andrew Lunn
2021-08-02 20:54   ` Sergei Shtylyov
2021-08-03  7:13     ` Biju Das
2021-08-02 10:26 ` [PATCH net-next v2 3/8] ravb: Add num_gstat_queue " Biju Das
2021-08-02 15:09   ` Andrew Lunn
2021-08-03 18:21   ` Sergei Shtylyov
2021-08-03 19:13     ` Biju Das
2021-08-03 19:22       ` Sergei Shtylyov
2021-08-03 19:47         ` Biju Das
2021-08-17 15:08           ` Biju Das
2021-08-02 10:26 ` [PATCH net-next v2 4/8] ravb: Add stats_len " Biju Das
2021-08-03 18:35   ` Sergei Shtylyov
2021-08-03 18:47     ` Biju Das
2021-08-03 19:20       ` Sergei Shtylyov
2021-08-02 10:26 ` [PATCH net-next v2 5/8] ravb: Add gstrings_stats and gstrings_size " Biju Das
2021-08-02 15:11   ` Andrew Lunn
2021-08-04 20:36   ` Sergei Shtylyov
2021-08-02 10:26 ` [PATCH net-next v2 6/8] ravb: Add net_features and net_hw_features " Biju Das
2021-08-02 15:12   ` Andrew Lunn
2021-08-05 19:07   ` Sergei Shtylyov
2021-08-05 19:18     ` Biju Das
2021-08-06 20:20       ` Sergei Shtylyov
2021-08-12  7:35         ` Biju Das
2021-08-06 20:31   ` Sergei Shtylyov
2021-08-02 10:26 ` [PATCH net-next v2 7/8] ravb: Add internal delay hw feature " Biju Das
2021-08-02 15:13   ` Andrew Lunn
2021-08-03 21:06   ` Sergei Shtylyov
2021-08-04  6:19     ` Biju Das
2021-08-03 21:12   ` Sergei Shtylyov
2021-08-04  5:13     ` Biju Das
2021-08-04  9:51       ` Sergey Shtylyov
2021-08-04 10:08         ` Biju Das
2021-08-04 10:34           ` Sergei Shtylyov [this message]
2021-08-04 10:20       ` Sergei Shtylyov
2021-08-04 10:32         ` Biju Das
2021-08-02 10:26 ` [PATCH net-next v2 8/8] ravb: Add tx_drop_cntrs " Biju Das
2021-08-02 15:14   ` Andrew Lunn
2021-08-04 20:50   ` Sergei Shtylyov
2021-08-17 15:47     ` Biju Das
2021-08-17 16:30       ` Sergey Shtylyov
2021-08-17 16:33         ` Biju Das

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