[PATCH stable 5.15 v3] net: bcmgenet: Fix EEE implementation

Florian Fainelli
2024-02-12T01:50:04Z

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: 6ef398ea60d9 ("net: bcmgenet: add EEE support")
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/20230606214348.2408018-1-florian.fainelli@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
Changes in v3:

- correctly apply to the 5.15 queue

.../net/ethernet/broadcom/genet/bcmgenet.c | 22 +++++++------------
.../net/ethernet/broadcom/genet/bcmgenet.h | 3 +++
drivers/net/ethernet/broadcom/genet/bcmmii.c | 6 +++++
3 files changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index eeadeeec17ba..380bf7a328ba 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -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);
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
index 5b7c2f9241d0..29bf256d13f6 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
@@ -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__ */
diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 2fbec2acb606..026f00ccaa0c 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -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)
--
2.34.1