linux-kernel - Re: [RESEND PATCH net-next v3 3/4] net: phy: aquantia: wait for the GLOBAL

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Message-ID: <708b9c82-afdd-46b7-ad63-b0e65be23b6b@lunn.ch>
Date: Fri, 19 Jul 2024 05:41:05 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Jon Hunter <jonathanh@...dia.com>
Cc: Bartosz Golaszewski <brgl@...ev.pl>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Brad Griffis <bgriffis@...dia.com>
Subject: Re: [RESEND PATCH net-next v3 3/4] net: phy: aquantia: wait for the
 GLOBAL_CFG to start returning real values

> Interestingly, the product brief for these PHYs [0] do show that both the
> AQR113C and AQR115C both support 10M. So I wonder if it is our ethernet
> controller that is not supporting 10M? I will check on this too.

The PHY should enumerate what it supports, look at
genphy_read_abilities(), which reads the Basic Mode Status Register,
and there are bits in there which indicate if the PHY supports 10Half
and 10Full.

The MAC should also be indicating what it support, and ethtool will be
showing you the combination of the two.

	Andrew