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

From: Alexander Stein <alexander.stein@ew.tq-group.com>
To: "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>,
	Jose Abreu <joabreu@synopsys.com>, Andrew Lunn <andrew@lunn.ch>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Feiyang Chen <chenfeiyang@loongson.cn>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Jakub Kicinski <kuba@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-stm32@st-md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	netdev@vger.kernel.org, Paolo Abeni <pabeni@redhat.com>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Vladimir Zapolskiy <vz@mleia.com>,
	Emil Renner Berthing <kernel@esmil.dk>,
	Samin Guo <samin.guo@starfivetech.com>,
	Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Samuel Holland <samuel@sholland.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno <angelogioacchino.
	delregno@collabora.com>,
	linux-sunxi@lists.linux.dev, linux-mediatek@lists.infradead.org
Subject: Re: [PATCH net-next] net: stmmac: clarify difference between "interface" and "phy_interface"
Date: Tue, 29 Aug 2023 15:20:43 +0200	[thread overview]
Message-ID: <5966848.lOV4Wx5bFT@steina-w> (raw)
In-Reply-To: <ZO3uUIFgtkIHHqjL@shell.armlinux.org.uk>

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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