netdev - Re: [PATCH net 5/5] net: pcs: rzn1-miic: Init RX clock early if MAC requires it

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Message-ID: <7712bd49-3827-636c-ceff-998b37cc2738@bootlin.com>
Date: Wed, 3 Jan 2024 16:45:48 +0100 (CET)
From: Romain Gantois <romain.gantois@...tlin.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
cc: Romain Gantois <romain.gantois@...tlin.com>, 
    Alexandre Torgue <alexandre.torgue@...s.st.com>, 
    Jose Abreu <joabreu@...opsys.com>, Andrew Lunn <andrew@...n.ch>, 
    Jakub Kicinski <kuba@...nel.org>, Heiner Kallweit <hkallweit1@...il.com>, 
    "David S. Miller" <davem@...emloft.net>, 
    Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
    Maxime Coquelin <mcoquelin.stm32@...il.com>, 
    Clément Léger <clement.leger@...tlin.com>, 
    Marek Vasut <marex@...x.de>, Clark Wang <xiaoning.wang@....com>, 
    Miquel Raynal <miquel.raynal@...tlin.com>, 
    Sylvain Girard <sylvain.girard@...com>, 
    Pascal EBERHARD <pascal.eberhard@...com>, netdev@...r.kernel.org, 
    linux-stm32@...md-mailman.stormreply.com, 
    linux-arm-kernel@...ts.infradead.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH net 5/5] net: pcs: rzn1-miic: Init RX clock early if MAC
 requires it

Hello Russel,

On Wed, 3 Jan 2024, Russell King (Oracle) wrote:
...
> Since the MAC driver has to itself provide the PCS to phylink via the
> mac_select_pcs() method, the MAC driver already has knowledge of which
> PCS it is going to be using. Therefore, I think it may make sense
> to do something like this:
> 
> int phylink_pcs_preconfig(struct phylink *pl, struct phylink_pcs *pcs)
> {
> 	if (pl->config->mac_requires_rxc)
> 		pcs->rxc_always_on = true;
> 
> 	if (pcs->ops->preconfig)
> 		pcs->ops->pcs_preconfig(pcs);
> }
> 
> and have stmmac call phylink_pcs_preconfig() for each PCS that it will
> be using during initialisation / resume paths?

Yes, that is definitely a much cleaner solution. I'll reimplement the PCS 
changes in this way.

Best Regards,

-- 
Romain Gantois, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com