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Commit 7dd275ce authored by Florian Fainelli's avatar Florian Fainelli Committed by Greg Kroah-Hartman
Browse files

net: bcmgenet: Fix EEE implementation 



commit a9f31047baca57d47440c879cf259b86f900260c upstream.

We had a number of short comings:

- EEE must be re-evaluated whenever the state machine detects a link
  change as wight be switching from a link partner with EEE
  enabled/disabled

- tx_lpi_enabled controls whether EEE should be enabled/disabled for the
  transmit path, which applies to the TBUF block

- We do not need to forcibly enable EEE upon system resume, as the PHY
  state machine will trigger a link event that will do that, too

Fixes: 6ef398ea ("net: bcmgenet: add EEE support")
Signed-off-by: default avatarFlorian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/20230606214348.2408018-1-florian.fainelli@broadcom.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 10c586da

drivers/net/ethernet/broadcom/genet/bcmgenet.c

+8 −14
Original line number Diff line number Diff line
@@ -1018,7 +1018,8 @@ static void bcmgenet_get_ethtool_stats(struct net_device *dev, 
	}

}



static void bcmgenet_eee_enable_set(struct net_device *dev, bool enable)

void bcmgenet_eee_enable_set(struct net_device *dev, bool enable,

			     bool tx_lpi_enabled)

{

	struct bcmgenet_priv *priv = netdev_priv(dev);

	u32 off = priv->hw_params->tbuf_offset + TBUF_ENERGY_CTRL;
@@ -1038,7 +1039,7 @@ static void bcmgenet_eee_enable_set(struct net_device *dev, bool enable) 


	/* Enable EEE and switch to a 27Mhz clock automatically */

	reg = bcmgenet_readl(priv->base + off);

	if (enable)

	if (tx_lpi_enabled)

		reg |= TBUF_EEE_EN | TBUF_PM_EN;

	else

		reg &= ~(TBUF_EEE_EN | TBUF_PM_EN);
@@ -1059,6 +1060,7 @@ static void bcmgenet_eee_enable_set(struct net_device *dev, bool enable) 


	priv->eee.eee_enabled = enable;

	priv->eee.eee_active = enable;

	priv->eee.tx_lpi_enabled = tx_lpi_enabled;

}



static int bcmgenet_get_eee(struct net_device *dev, struct ethtool_eee *e)
@@ -1074,6 +1076,7 @@ static int bcmgenet_get_eee(struct net_device *dev, struct ethtool_eee *e) 


	e->eee_enabled = p->eee_enabled;

	e->eee_active = p->eee_active;

	e->tx_lpi_enabled = p->tx_lpi_enabled;

	e->tx_lpi_timer = bcmgenet_umac_readl(priv, UMAC_EEE_LPI_TIMER);



	return phy_ethtool_get_eee(dev->phydev, e);
@@ -1083,7 +1086,6 @@ static int bcmgenet_set_eee(struct net_device *dev, struct ethtool_eee *e) 
{

	struct bcmgenet_priv *priv = netdev_priv(dev);

	struct ethtool_eee *p = &priv->eee;

	int ret = 0;



	if (GENET_IS_V1(priv))

		return -EOPNOTSUPP;
@@ -1094,16 +1096,11 @@ static int bcmgenet_set_eee(struct net_device *dev, struct ethtool_eee *e) 
	p->eee_enabled = e->eee_enabled;



	if (!p->eee_enabled) {

		bcmgenet_eee_enable_set(dev, false);

		bcmgenet_eee_enable_set(dev, false, false);

	} else {

		ret = phy_init_eee(dev->phydev, 0);

		if (ret) {

			netif_err(priv, hw, dev, "EEE initialization failed\n");

			return ret;

		}



		p->eee_active = phy_init_eee(dev->phydev, false) >= 0;

		bcmgenet_umac_writel(priv, e->tx_lpi_timer, UMAC_EEE_LPI_TIMER);

		bcmgenet_eee_enable_set(dev, true);

		bcmgenet_eee_enable_set(dev, p->eee_active, e->tx_lpi_enabled);

	}



	return phy_ethtool_set_eee(dev->phydev, e);
@@ -3688,9 +3685,6 @@ static int bcmgenet_resume(struct device *d) 
	if (!device_may_wakeup(d))

		phy_resume(dev->phydev);



	if (priv->eee.eee_enabled)

		bcmgenet_eee_enable_set(dev, true);



	bcmgenet_netif_start(dev);



	netif_device_attach(dev);

drivers/net/ethernet/broadcom/genet/bcmgenet.h

+3 −0
Original line number Diff line number Diff line
@@ -736,4 +736,7 @@ int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv, 
void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,

			       enum bcmgenet_power_mode mode);



void bcmgenet_eee_enable_set(struct net_device *dev, bool enable,

			     bool tx_lpi_enabled);



#endif /* __BCMGENET_H__ */

drivers/net/ethernet/broadcom/genet/bcmmii.c

+6 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 


#include "bcmgenet.h"





/* setup netdev link state when PHY link status change and

 * update UMAC and RGMII block when link up

 */
@@ -96,6 +97,11 @@ void bcmgenet_mii_setup(struct net_device *dev) 
			       CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE);

		reg |= cmd_bits;

		bcmgenet_umac_writel(priv, reg, UMAC_CMD);



		priv->eee.eee_active = phy_init_eee(phydev, 0) >= 0;

		bcmgenet_eee_enable_set(dev,

					priv->eee.eee_enabled && priv->eee.eee_active,

					priv->eee.tx_lpi_enabled);

	} else {

		/* done if nothing has changed */

		if (!status_changed)