linux-kernel - RE: [PATCH net-next v5 3/3] net: stmmac: Add DWMAC glue layer for Renesas GBETH

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Message-ID:
 <TY3PR01MB11346FA4767B74B2CBB2CAFB786B82@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Mon, 21 Apr 2025 14:22:01 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Andrew Lunn <andrew@...n.ch>
CC: "Lad, Prabhakar" <prabhakar.csengg@...il.com>, "Russell King (Oracle)"
	<linux@...linux.org.uk>, Andrew Lunn <andrew+netdev@...n.ch>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre
 Torgue <alexandre.torgue@...s.st.com>, Richard Cochran
	<richardcochran@...il.com>, Philipp Zabel <p.zabel@...gutronix.de>, Geert
 Uytterhoeven <geert+renesas@...der.be>, Magnus Damm <magnus.damm@...il.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>, Jose Abreu
	<joabreu@...opsys.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-stm32@...md-mailman.stormreply.com"
	<linux-stm32@...md-mailman.stormreply.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-renesas-soc@...r.kernel.org"
	<linux-renesas-soc@...r.kernel.org>, Fabrizio Castro
	<fabrizio.castro.jz@...esas.com>, Prabhakar Mahadev Lad
	<prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH net-next v5 3/3] net: stmmac: Add DWMAC glue layer for
 Renesas GBETH

Hi Andrew,

> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: 21 April 2025 15:02
> Subject: Re: [PATCH net-next v5 3/3] net: stmmac: Add DWMAC glue layer for Renesas GBETH
> 
> > > On the RZ/G3E, the upstream support for testing S2R is not yet in a
> > > usable state. So for now, I'll switch to using init/exit callbacks and drop the PM callback.
> >
> > FYI, On RZ/G3E, for STR to work with mainline, we need to reinitialize the PHY.
> > I have done below changes on top of [1] to make STR working.
> 
> Can you explain why you need to reinitialise the PHY? The MAC driver should not need to do this, so
> something is wrong somewhere. If we understand the 'Why?' we can probably tell you a better way to do
> this.

Without this change bind/unbind works. But for the STR case, without reinitializing the PHY, even though
the IP link is UP, I am not able to talk the NFS server or ping the host properly.

I checked clock/reset before and after reset everything set as expected.

Only change during STR is, on wakeup we need to restore direction (MII/RGMII) of IO block 
for ET0/1_TXC_TXCLK (IO attribute) in the pin control driver. After that looks like PHY init
is required to talk to server. 

Cheers,
Biju