linux-kernel - Re: [PATCH net-next v2 3/3] net: phy: mediatek: add driver for built-in 2.5G ethernet PHY on MT7988

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Message-ID: <Z77kcqzmCqdT6lE0@shell.armlinux.org.uk>
Date: Wed, 26 Feb 2025 09:52:50 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: SkyLake Huang (黃啟澤) <SkyLake.Huang@...iatek.com>
Cc: "andrew@...n.ch" <andrew@...n.ch>,
	"dqfext@...il.com" <dqfext@...il.com>,
	Steven Liu (劉人豪) <steven.liu@...iatek.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hkallweit1@...il.com" <hkallweit1@...il.com>,
	"horms@...nel.org" <horms@...nel.org>,
	"daniel@...rotopia.org" <daniel@...rotopia.org>,
	"kuba@...nel.org" <kuba@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH net-next v2 3/3] net: phy: mediatek: add driver for
 built-in 2.5G ethernet PHY on MT7988

On Wed, Feb 26, 2025 at 06:48:34AM +0000, SkyLake Huang (黃啟澤) wrote:
> On Wed, 2025-02-19 at 09:33 +0000, Russell King (Oracle) wrote:
> > 
> > External email : Please do not click links or open attachments until
> > you have verified the sender or the content.
> > 
> > 
> > On Wed, Feb 19, 2025 at 04:39:10PM +0800, Sky Huang wrote:
> > > +static int mt798x_2p5ge_phy_config_init(struct phy_device *phydev)
> > > +{
> > > +     struct pinctrl *pinctrl;
> > > +     int ret;
> > > +
> > > +     /* Check if PHY interface type is compatible */
> > > +     if (phydev->interface != PHY_INTERFACE_MODE_INTERNAL)
> > > +             return -ENODEV;
> > > +
> > > +     ret = mt798x_2p5ge_phy_load_fw(phydev);
> > > +     if (ret < 0)
> > > +             return ret;
> > 
> > Firmware should not be loaded in the .config_init method. The above
> > call will block while holding the RTNL which will prevent all other
> > network configuration until the firmware has been loaded or the load
> > fails.
> > 
> > Thanks.
> > 
> > --
> > RMK's Patch system:
> > https://urldefense.com/v3/__https://www.armlinux.org.uk/developer/patches/__;!!CTRNKA9wMg0ARbw!iV-1ViPFsUV-lLj7aIycan8nery6sQO3t6mkpdlb_GW8hswhxc4ejJozxqkU3s2WzxSizs4kfdC77yr7HGGRIuU$
> > FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
> Hi Russell,
> mt798x_p5ge_phy_load_fw() will only load firmware once after driver is
> probed through priv->fw_loaded. And actually, firmware loading
> procedure only takes about 11ms. This was discussed earlier in:
> https://patchwork.kernel.org/project/linux-mediatek/patch/20240520113456.21675-6-SkyLake.Huang@mediatek.com/#25856462
> https://patchwork.kernel.org/project/linux-mediatek/patch/20240520113456.21675-6-SkyLake.Huang@mediatek.com/#25857174

1. Wouldn't it be a good idea to include the loading time in the patch
   description or a comment in the patch?

2. What about the time it takes for request_firmware() uses the sysfs
   fallback, which essentially passes the firmware request to userspace
   to deal with? That can block for an indeterminate amount of time.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!