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From: Biju Das <biju.das.jz@bp.renesas.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Sergei Shtylyov <sergei.shtylyov@gmail.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Sergey Shtylyov <s.shtylyov@omprussia.ru>,
	Adam Ford <aford173@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	Andrew Gabbasov <andrew_gabbasov@mentor.com>,
	Yuusuke Ashizuka <ashiduka@fujitsu.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/RFC 2/2] ravb: Add GbEthernet driver support
Date: Wed, 14 Jul 2021 17:56:46 +0000	[thread overview]
Message-ID: <OS0PR01MB592285AAA88B1BDA84F3C20B86139@OS0PR01MB5922.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <YO8eILdf4orh0ISY@lunn.ch>

Hi Andrew Lunn,

Thanks for the feedback.

> Subject: Re: [PATCH/RFC 2/2] ravb: Add GbEthernet driver support
> 
> On Wed, Jul 14, 2021 at 05:01:34PM +0000, Biju Das wrote:
> > Hi Andrew Lunn,
> >
> > Thanks for the feedback.
> >
> > > Subject: Re: [PATCH/RFC 2/2] ravb: Add GbEthernet driver support
> > >
> > > > +	if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID) {
> > > > +		ravb_write(ndev, ravb_read(ndev, CXR31)
> > > > +			 | CXR31_SEL_LINK0, CXR31);
> > > > +	} else {
> > > > +		ravb_write(ndev, ravb_read(ndev, CXR31)
> > > > +			 & ~CXR31_SEL_LINK0, CXR31);
> > > > +	}
> > >
> > > You need to be very careful here. What value is passed to the PHY?
> >
> > PHY_INTERFACE_MODE_RGMII is the value passed to PHY.
> 
> In all four cases? So if DT contains rgmii-txid, or rgmii-rxid, the
> requested delay will not happen in either the MAC or the PHY?

OK, it is my mistake. I specified "rgmii" in DT. 

Without phy delays (rx and tx) ethernet won't work. Will fix it as "rgmii-id" in dt.

The above register(In-band Status set register) is basically used for selecting the link.

> 
> In general in Linux, MAC drivers don't add any delays, and request the PHY
> to do it. There are some MAC drivers which do it differently, they add the
> delays, but that is uncommon. So unless you have a good reason not to, i
> would suggest you leave the PHY to do the delays.

OK. 


Regards,
Biju

  reply	other threads:[~2021-07-14 17:56 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-14 14:54 [PATCH/RFC 0/2] Add Gigabit Ethernet " Biju Das
2021-07-14 14:54 ` [PATCH/RFC 1/2] ravb: Preparation for supporting Gigabit Ethernet driver Biju Das
2021-07-14 15:39   ` Andrew Lunn
2021-07-14 16:24     ` Biju Das
2021-07-14 18:20   ` Sergei Shtylyov
2021-07-15  6:49     ` Biju Das
2021-07-14 14:54 ` [PATCH/RFC 2/2] ravb: Add GbEthernet driver support Biju Das
2021-07-14 16:02   ` Andrew Lunn
2021-07-14 17:01     ` Biju Das
2021-07-14 17:25       ` Andrew Lunn
2021-07-14 17:56         ` Biju Das [this message]
2021-07-15 10:13   ` Geert Uytterhoeven
2021-07-15 10:31     ` Biju Das
2021-07-19 20:41   ` Sergei Shtylyov
2021-07-20  6:32     ` Biju Das
2021-07-14 19:26 ` [PATCH/RFC 0/2] Add Gigabit Ethernet " Sergei Shtylyov

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