netdev - Re: [PATCH RFC 01/18] net: phy: Add phydev->eee_active to simplify adjust link callbacks

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Date:   Fri, 17 Feb 2023 10:09:19 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Doug Berger <opendmb@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Wei Fang <wei.fang@....com>,
        Shenwei Wang <shenwei.wang@....com>,
        Clark Wang <xiaoning.wang@....com>,
        NXP Linux Team <linux-imx@....com>,
        UNGLinuxDriver@...rochip.com, Byungho An <bh74.an@...sung.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Oleksij Rempel <linux@...pel-privat.de>
Subject: Re: [PATCH RFC 01/18] net: phy: Add phydev->eee_active to simplify
 adjust link callbacks

On Fri, Feb 17, 2023 at 04:42:13AM +0100, Andrew Lunn wrote:
> MAC drivers which support EEE need to know the results of the EEE
> auto-neg in order to program the hardware to perform EEE or not.  The
> oddly named phy_init_eee() can be used to determine this, it returns 0
> if EEE should be used, or a negative error code,
> e.g. -EOPPROTONOTSUPPORT if the PHY does not support EEE or negotiate
> resulted in it not being used.
> 
> However, many MAC drivers get this wrong. Add phydev->eee_active which
> indicates the result of the autoneg for EEE, including if EEE is
> administratively disabled with ethtool. The MAC driver can then access
> this in the same way as link speed and duplex in the adjust link
> callback.
> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> ---
>  drivers/net/phy/phy.c | 3 +++
>  include/linux/phy.h   | 2 ++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
> index b33e55a7364e..1e6df250d0d0 100644
> --- a/drivers/net/phy/phy.c
> +++ b/drivers/net/phy/phy.c
> @@ -916,9 +916,12 @@ static int phy_check_link_status(struct phy_device *phydev)
>  	if (phydev->link && phydev->state != PHY_RUNNING) {
>  		phy_check_downshift(phydev);
>  		phydev->state = PHY_RUNNING;
> +		phydev->eee_active = genphy_c45_eee_is_active(phydev,
> +							      NULL, NULL, NULL);

genphy_c45_eee_is_active() may return an error.

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