linux-kernel - RE: [PATCH net-next v5 8/8] net: fec: Fixup EEE

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Date: Fri, 23 Feb 2024 06:03:50 +0000
From: Wei Fang <wei.fang@....com>
To: Oleksij Rempel <o.rempel@...gutronix.de>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Andrew Lunn
	<andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Russell King
	<linux@...linux.org.uk>
CC: "kernel@...gutronix.de" <kernel@...gutronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, Shenwei Wang
	<shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>, dl-linux-imx
	<linux-imx@....com>
Subject: RE: [PATCH net-next v5 8/8] net: fec: Fixup EEE

> -----Original Message-----
> From: Oleksij Rempel <o.rempel@...gutronix.de>
> Sent: 2024年2月21日 14:21
> To: Wei Fang <wei.fang@....com>; David S. Miller <davem@...emloft.net>;
> Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>;
> Paolo Abeni <pabeni@...hat.com>; Andrew Lunn <andrew@...n.ch>;
> Heiner Kallweit <hkallweit1@...il.com>; Russell King
> <linux@...linux.org.uk>
> Cc: Oleksij Rempel <o.rempel@...gutronix.de>; kernel@...gutronix.de;
> linux-kernel@...r.kernel.org; netdev@...r.kernel.org; Shenwei Wang
> <shenwei.wang@....com>; Clark Wang <xiaoning.wang@....com>;
> dl-linux-imx <linux-imx@....com>
> Subject: [PATCH net-next v5 8/8] net: fec: Fixup EEE
> 
> From: Andrew Lunn <andrew@...n.ch>
> 
> The enabling/disabling of EEE in the MAC should happen as a result of auto
> negotiation. So move the enable/disable into
> fec_enet_adjust_link() which gets called by phylib when there is a change in
> link status.
> 
> fec_enet_set_eee() now just stores away the LPI timer value.
> Everything else is passed to phylib, so it can correctly setup the PHY.
> 
> fec_enet_get_eee() relies on phylib doing most of the work, the MAC driver
> just adds the LPI timer value.
> 
> Call phy_support_eee() if the quirk is present to indicate the MAC actually
> supports EEE.
> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> Tested-by: Oleksij Rempel <o.rempel@...gutronix.de> (On iMX8MP debix)
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
> v2: Only call fec_enet_eee_mode_set for those that support EEE
> v7: update against kernel v6.8-rc4
> ---
>  drivers/net/ethernet/freescale/fec_main.c | 23 +++++------------------
>  1 file changed, 5 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> b/drivers/net/ethernet/freescale/fec_main.c
> index a2c786550342..d7693fdf640d 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -2033,13 +2033,8 @@ static int fec_enet_eee_mode_set(struct
> net_device *ndev, bool enable)
>  	struct fec_enet_private *fep = netdev_priv(ndev);
>  	struct ethtool_keee *p = &fep->eee;
>  	unsigned int sleep_cycle, wake_cycle;
> -	int ret = 0;
> 
>  	if (enable) {
> -		ret = phy_init_eee(ndev->phydev, false);
> -		if (ret)
> -			return ret;
> -
>  		sleep_cycle = fec_enet_us_to_tx_cycle(ndev, p->tx_lpi_timer);
>  		wake_cycle = sleep_cycle;
>  	} else {
> @@ -2047,8 +2042,6 @@ static int fec_enet_eee_mode_set(struct
> net_device *ndev, bool enable)
>  		wake_cycle = 0;
>  	}
> 
> -	p->tx_lpi_enabled = enable;
> -
>  	writel(sleep_cycle, fep->hwp + FEC_LPI_SLEEP);
>  	writel(wake_cycle, fep->hwp + FEC_LPI_WAKE);
> 
> @@ -2094,6 +2087,8 @@ static void fec_enet_adjust_link(struct net_device
> *ndev)
>  			netif_tx_unlock_bh(ndev);
>  			napi_enable(&fep->napi);
>  		}
> +		if (fep->quirks & FEC_QUIRK_HAS_EEE)
> +			fec_enet_eee_mode_set(ndev, phy_dev->enable_tx_lpi);
>  	} else {
>  		if (fep->link) {
>  			netif_stop_queue(ndev);
> @@ -2453,6 +2448,9 @@ static int fec_enet_mii_probe(struct net_device
> *ndev)
>  	else
>  		phy_set_max_speed(phy_dev, 100);
> 
> +	if (fep->quirks & FEC_QUIRK_HAS_EEE)
> +		phy_support_eee(phy_dev);
> +
>  	fep->link = 0;
>  	fep->full_duplex = 0;
> 
> @@ -3172,7 +3170,6 @@ fec_enet_get_eee(struct net_device *ndev, struct
> ethtool_keee *edata)
>  		return -ENETDOWN;
> 
>  	edata->tx_lpi_timer = p->tx_lpi_timer;
> -	edata->tx_lpi_enabled = p->tx_lpi_enabled;
> 
>  	return phy_ethtool_get_eee(ndev->phydev, edata);  } @@ -3182,7
> +3179,6 @@ fec_enet_set_eee(struct net_device *ndev, struct ethtool_keee
> *edata)  {
>  	struct fec_enet_private *fep = netdev_priv(ndev);
>  	struct ethtool_keee *p = &fep->eee;
> -	int ret = 0;
> 
>  	if (!(fep->quirks & FEC_QUIRK_HAS_EEE))
>  		return -EOPNOTSUPP;
> @@ -3192,15 +3188,6 @@ fec_enet_set_eee(struct net_device *ndev, struct
> ethtool_keee *edata)
> 
>  	p->tx_lpi_timer = edata->tx_lpi_timer;
> 
> -	if (!edata->eee_enabled || !edata->tx_lpi_enabled ||
> -	    !edata->tx_lpi_timer)
> -		ret = fec_enet_eee_mode_set(ndev, false);
> -	else
> -		ret = fec_enet_eee_mode_set(ndev, true);
> -
> -	if (ret)
> -		return ret;
> -
>  	return phy_ethtool_set_eee(ndev->phydev, edata);  }
> 
> --
> 2.39.2

Reviewed-by: Wei Fang <wei.fang@....com>