linux-kernel - Re: [PATCH net-next v3 5/5] net: phy: add driver for built-in 2.5G ethernet PHY on MT7988

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Date: Tue, 21 May 2024 08:17:32 +0000
From: SkyLake Huang (黃啟澤)
	<SkyLake.Huang@...iatek.com>
To: "andrew@...n.ch" <andrew@...n.ch>
CC: "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>, "linux@...linux.org.uk"
	<linux@...linux.org.uk>, "kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"dqfext@...il.com" <dqfext@...il.com>,
	Steven Liu (劉人豪) <steven.liu@...iatek.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>, "davem@...emloft.net"
	<davem@...emloft.net>, "hkallweit1@...il.com" <hkallweit1@...il.com>,
	"daniel@...rotopia.org" <daniel@...rotopia.org>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH net-next v3 5/5] net: phy: add driver for built-in 2.5G
 ethernet PHY on MT7988

On Mon, 2024-05-20 at 15:35 +0200, Andrew Lunn wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  > +static int mt798x_2p5ge_phy_config_init(struct phy_device
> *phydev)
> > +{
> > +struct mtk_i2p5ge_phy_priv *priv = phydev->priv;
> > +struct device *dev = &phydev->mdio.dev;
> > +const struct firmware *fw;
> > +struct pinctrl *pinctrl;
> > +int ret, i;
> > +u16 reg;
> > +
> > +if (!priv->fw_loaded) {
> > +if (!priv->md32_en_cfg_base || !priv->pmb_addr) {
> > +dev_err(dev, "MD32_EN_CFG base & PMB addresses aren't valid\n");
> > +return -EINVAL;
> > +}
> 
> ...
> 
> > +static int mt798x_2p5ge_phy_probe(struct phy_device *phydev)
> > +{
> > +struct mtk_i2p5ge_phy_priv *priv;
> > +
> > +priv = devm_kzalloc(&phydev->mdio.dev,
> > +    sizeof(struct mtk_i2p5ge_phy_priv), GFP_KERNEL);
> > +if (!priv)
> > +return -ENOMEM;
> > +
> > +switch (phydev->drv->phy_id) {
> > +case MTK_2P5GPHY_ID_MT7988:
> > +priv->pmb_addr = ioremap(MT7988_2P5GE_PMB_BASE,
> MT7988_2P5GE_PMB_LEN);
> > +if (!priv->pmb_addr)
> > +return -ENOMEM;
> > +priv->md32_en_cfg_base = ioremap(MT7988_2P5GE_MD32_EN_CFG_BASE,
> > + MT7988_2P5GE_MD32_EN_CFG_LEN);
> > +if (!priv->md32_en_cfg_base)
> > +return -ENOMEM;
> > +
> > +/* The original hardware only sets MDIO_DEVS_PMAPMD */
> > +phydev->c45_ids.mmds_present |= (MDIO_DEVS_PCS | MDIO_DEVS_AN |
> > + MDIO_DEVS_VEND1 | MDIO_DEVS_VEND2);
> > +break;
> > +default:
> > +return -EINVAL;
> > +}
> 
> How can priv->md32_en_cfg_base or priv->pmb_addr not be set in
> mt798x_2p5ge_phy_config_init()
> 
> Andrew
Use command "$ifconfig eth1 down" and then "$ifconfig eth1 up",
mt798x_2p5ge_phy_config_init() will be called again and again. priv-
>md32_en_cfg_base & priv->pmb_addr are released after first firmware
loading. So just check these two values again for safety once priv-
>fw_loaded is overrided unexpectedly.