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

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Message-ID: <ZO3uUIFgtkIHHqjL@shell.armlinux.org.uk>
Date: Tue, 29 Aug 2023 14:10:40 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Alexander Stein <alexander.stein@...tq-group.com>
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"

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

-- 
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