netdev - Re: [PATCH net-next] net: stmmac: clarify difference between "interface" and "phy

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Date: Tue, 29 Aug 2023 15:20:43 +0200
From: Alexander Stein <alexander.stein@...tq-group.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu <joabreu@...opsys.com>, Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Feiyang Chen <chenfeiyang@...ngson.cn>, Heiner Kallweit <hkallweit1@...il.com>, Jakub Kicinski <kuba@...nel.org>, linux-arm-kernel@...ts.infradead.org, linux-stm32@...md-mailman.stormreply.com, Maxime Coquelin <mcoquelin.stm32@...il.com>, netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, NXP Linux Team <linux-imx@....com>, Vladimir Zapolskiy <vz@...ia.com>, Emil Renner Berthing <kernel@...il.dk>, Samin Guo <samin.guo@...rfivetech.com>, Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, Samuel Holland <samuel@...lland.org>, Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno <angelogioacchino.
 delregno@...labora.com>, linux-sunxi@...ts.linux.dev, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next] net: stmmac: clarify difference between "interface" and "phy_interface"

Am Dienstag, 29. August 2023, 15:10:40 CEST schrieb Russell King (Oracle):
> On Tue, Aug 29, 2023 at 02:38:33PM +0200, Alexander Stein wrote:
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > > b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c index
> > > ff330423ee66..35f4b1484029 100644
> > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > > @@ -419,9 +419,9 @@ stmmac_probe_config_dt(struct platform_device *pdev,
> > > u8
> > > *mac) return ERR_PTR(phy_mode);
> > > 
> > >  	plat->phy_interface = phy_mode;
> > > 
> > > -	plat->interface = stmmac_of_get_mac_mode(np);
> > > -	if (plat->interface < 0)
> > > -		plat->interface = plat->phy_interface;
> > > +	plat->mac_interface = stmmac_of_get_mac_mode(np);
> > > +	if (plat->mac_interface < 0)
> > 
> > This check is never true as mac_interface is now an unsigned enum
> > (phy_interface_t). Thus mac_interface is not set to phy_interface
> > resulting in an invalid mac_interface. My platform
> > (arch/arm64/boot/dts/freescale/imx8mp- tqma8mpql-mba8mpxl.dts) fails to
> > probe now.
> 
> Thanks for catching that. Does this patch fix it for you?
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c index
> 231152ee5a32..0451d2c2aa43 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -420,9 +420,9 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8
> *mac) return ERR_PTR(phy_mode);
> 
>  	plat->phy_interface = phy_mode;
> -	plat->interface = stmmac_of_get_mac_mode(np);
> -	if (plat->interface < 0)
> -		plat->interface = plat->phy_interface;
> +
> +	rc = stmmac_of_get_mac_mode(np);
> +	plat->interface = rc < 0 ? plat->phy_interface : rc;

I need to use plat->mac_interface on top of your patch. But despite that this 
fixes the probe error.

Thanks and best regards,
Alexander

> 
>  	/* Some wrapper drivers still rely on phy_node. Let's save it while
>  	 * they are not converted to phylink. */

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