netdev - 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: <0f52f7d005e2bf6449568812002ee95dc9b6c346.camel@mediatek.com>
Date: Tue, 13 May 2025 11:01:57 +0000
From: SkyLake Huang (黃啟澤)
	<SkyLake.Huang@...iatek.com>
To: "linux@...linux.org.uk" <linux@...linux.org.uk>
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 Tue, 2025-05-13 at 18:12 +0800, SkyLake.Huang 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!
> 
> Actually, I wrote fw loading flow in .probe. However, during boot
> time,
> .probe is called at very early stage (about the first 2s after
> booting
> into Linux Kernel). At that time, filesystem isn't ready yet and phy
> driver can't locate /lib/firmware/mediatek/mt7988/i2p5ge-phy-pmb.bin.
> Adding "-EPROBE_DEFER" doesn't help at this moment. I'm not sure how
> aquantia and qt2025 drivers handle this.
> 
> But anyway, mt7988's built-in phy driver loads firmware in only a few
> ms. This is via internal bus instead of MDIO bus, so loading speed is
> much faster. Will this have any impact, if that's the case?
> 
> BRs,
> Sky

This message is replied in wrong place. Please ignore, thanks.

BRs,
Sky