linux-kernel - Re: [PATCH net-next v2 5/5] net: phy: add driver for built-in 2.5G ethernet PHY on MT7988

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Date: Mon, 20 May 2024 18:48:36 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>
Cc: SkyLake Huang (黃啟澤) <SkyLake.Huang@...iatek.com>,
	"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>,
	"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 v2 5/5] net: phy: add driver for built-in 2.5G
 ethernet PHY on MT7988

On Mon, May 20, 2024 at 03:02:21PM +0200, Andrew Lunn wrote:
> > Actually this phy is strictly binded to (XFI)MAC on this platform.
> > So I directly disable HDX feature of PHY.
> 
> Sorry, i don't follow your answer:
> 
> Can the PHY do half duplex?
> Can the MAC do half duplex?
> 
> The part which cannot do half-duplex should be the part which disables
> half-duplex.

Note that if the PHY is doing rate adaption (preferably in a form that
it can control the MAC transmission rate), then even if the MAC can't
do half-duplex, the PHY can still do half-duplex.

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