[PATCH net-next v3 00/18] net: stmmac: clean up and fix EEE implementation

[PATCH net-next v3 00/18] net: stmmac: clean up and fix EEE implementation

[Russell King (Oracle)]

Hi,

This is a rework of stmmac's EEE support in light of the addition of EEE
management to phylib. It's slightly more than 15 patches, but I think it
makes sense to be so.

Patch 1 adds configuration of the receive clock phy_eee_rx_clock_stop()
(which was part of another series, but is necessary for this patch set.)

Patch 2 converts stmmac to use phylib's tracking of tx_lpi_timer.

Patch 3 corrects the data type used for things involving the LPI
timer. The user API uses u32, so stmmac should do too, rather than
blindly converting it to "int". eee_timer is left for patch 4.

Patch 4 (new) uses an unsigned int for eee_timer.

Patch 5 makes stmmac EEE state depend on phylib's enable_tx_lpi flag,
thus using phylib's resolution of EEE state.

Patch 6 removes redundant code from the ethtool EEE operations.

Patch 7 removes some redundant code in stmmac_disable_eee_mode()
and renames it to stmmac_disable_sw_eee_mode() to better reflect its
purpose.

Patch 8 removes the driver private tx_lpi_enabled, which is managed by
phylib since patch 4.

Patch 9 removes the dependence of EEE error statistics on the EEE
enable state, instead depending on whether EEE is supported by the
hardware.

Patch 10 removes phy_init_eee(), instead using phy_eee_rx_clock_stop()
to configure whether the PHY may stop the receive clock.

Patch 11 removes priv->eee_tw_timer, which is only ever set to one
value at probe time, effectively it is a constant. Hence this is
unnecessary complexity.

Patch 12 moves priv->eee_enabled into stmmac_eee_init(), and placing
it under the protection of priv->lock, except when EEE is not
supported (where it becomes constant-false.)

Patch 13 moves priv->eee_active also into stmmac_eee_init(), so
the indication whether EEE should be enabled or not is passed in
to this function.

Since both priv->eee_enabled and priv->eee_active are assigned
true/false values, they should be typed "bool". Make it sew in
patch 14. No Singer machine required.

Patch 15 moves the initialisation of priv->eee_ctrl_timer to the
probe function - it makes no sense to re-initialise the timer each
time we want to start using it.

Patch 16 removes the unnecessary EEE handling in the driver tear-down
method. The core net code will have brought the interface down
already, meaning EEE has already been disabled.

Patch 17 reorganises the code to split the hardware LPI timer
control paths from the software LPI timer paths.

Patch 18 works on this further by eliminating
stmmac_lpi_entry_timer_config() and making direct calls to the new
functions. This reveals a potential bug where priv->eee_sw_timer_en
is set true when EEE is disabled. This is not addressed in this
series, but will be in a future separate patch - so that if fixing
that causes a regression, it can be handled separately.

 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c  |   4 +-
 drivers/net/ethernet/stmicro/stmmac/hwif.h         |   2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac.h       |  10 +-
 .../net/ethernet/stmicro/stmmac/stmmac_ethtool.c   |  25 +----
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 103 +++++++++++----------
 drivers/net/phy/phy.c                              |  27 +++++-
 include/linux/phy.h                                |   1 +
 7 files changed, 85 insertions(+), 87 deletions(-)

Changes in v3:
- fix kerneldoc issue in old patch 12.
- add Andrew's r-bs.
- split eee_timer from other u32 conversions, remove check for
  negative eee_timer.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

[PATCH net-next v3 01/18] net: phy: add configuration of rx clock stop mode

[Russell King (Oracle)]

Add a function to allow configuration of the PCS's clock stop enable
bit, used to configure whether the xMII receive clock can be stopped
during LPI mode.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/phy/phy.c | 27 ++++++++++++++++++++++-----
 include/linux/phy.h   |  1 +
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index e4b04cdaa995..a4b9fcc2503a 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -1640,6 +1640,27 @@ void phy_mac_interrupt(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(phy_mac_interrupt);
 
+/**
+ * phy_eee_rx_clock_stop() - configure PHY receive clock in LPI
+ * @phydev: target phy_device struct
+ * @clk_stop_enable: flag to indicate whether the clock can be stopped
+ *
+ * Configure whether the PHY can disable its receive clock during LPI mode,
+ * See IEEE 802.3 sections 22.2.2.2, 35.2.2.10, and 45.2.3.1.4.
+ *
+ * Returns: 0 or negative error.
+ */
+int phy_eee_rx_clock_stop(struct phy_device *phydev, bool clk_stop_enable)
+{
+	/* Configure the PHY to stop receiving xMII
+	 * clock while it is signaling LPI.
+	 */
+	return phy_modify_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
+			      MDIO_PCS_CTRL1_CLKSTOP_EN,
+			      clk_stop_enable ? MDIO_PCS_CTRL1_CLKSTOP_EN : 0);
+}
+EXPORT_SYMBOL_GPL(phy_eee_rx_clock_stop);
+
 /**
  * phy_init_eee - init and check the EEE feature
  * @phydev: target phy_device struct
@@ -1664,11 +1685,7 @@ int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
 		return -EPROTONOSUPPORT;
 
 	if (clk_stop_enable)
-		/* Configure the PHY to stop receiving xMII
-		 * clock while it is signaling LPI.
-		 */
-		ret = phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
-				       MDIO_PCS_CTRL1_CLKSTOP_EN);
+		ret = phy_eee_rx_clock_stop(phydev, true);
 
 	return ret < 0 ? ret : 0;
 }
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 5bc71d59910c..4875465653ca 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -2096,6 +2096,7 @@ int phy_unregister_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask);
 int phy_unregister_fixup_for_id(const char *bus_id);
 int phy_unregister_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask);
 
+int phy_eee_rx_clock_stop(struct phy_device *phydev, bool clk_stop_enable);
 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable);
 int phy_get_eee_err(struct phy_device *phydev);
 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_keee *data);
-- 
2.30.2

[PATCH net-next v3 02/18] net: stmmac: move tx_lpi_timer tracking to phylib

[Russell King (Oracle)]

When stmmac_ethtool_op_get_eee() is called, stmmac sets the tx_lpi_timer
and tx_lpi_enabled members, and then calls into phylink and thus phylib.
phylib overwrites these members.

phylib will also cause a link down/link up transition when settings
that impact the MAC have been changed.

Convert stmmac to use the tx_lpi_timer setting in struct phy_device,
updating priv->tx_lpi_timer each time when the link comes up, rather
than trying to maintain this user setting itself. We initialise the
phylib tx_lpi_timer setting by doing a get_ee-modify-set_eee sequence
with the last known priv->tx_lpi_timer value. In order for this to work
correctly, we also need this member to be initialised earlier.

As stmmac_eee_init() is no longer called outside of stmmac_main.c, make
it static.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  1 -
 .../ethernet/stmicro/stmmac/stmmac_ethtool.c  | 14 +------------
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 21 ++++++++++++++-----
 3 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index b8d631e559c0..df386fc948ec 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -406,7 +406,6 @@ int stmmac_dvr_probe(struct device *device,
 		     struct plat_stmmacenet_data *plat_dat,
 		     struct stmmac_resources *res);
 void stmmac_disable_eee_mode(struct stmmac_priv *priv);
-bool stmmac_eee_init(struct stmmac_priv *priv);
 int stmmac_reinit_queues(struct net_device *dev, u32 rx_cnt, u32 tx_cnt);
 int stmmac_reinit_ringparam(struct net_device *dev, u32 rx_size, u32 tx_size);
 int stmmac_bus_clks_config(struct stmmac_priv *priv, bool enabled);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 16b4d8c21c90..0429a99a8114 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -898,7 +898,6 @@ static int stmmac_ethtool_op_get_eee(struct net_device *dev,
 	if (!priv->dma_cap.eee)
 		return -EOPNOTSUPP;
 
-	edata->tx_lpi_timer = priv->tx_lpi_timer;
 	edata->tx_lpi_enabled = priv->tx_lpi_enabled;
 
 	return phylink_ethtool_get_eee(priv->phylink, edata);
@@ -908,7 +907,6 @@ static int stmmac_ethtool_op_set_eee(struct net_device *dev,
 				     struct ethtool_keee *edata)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
-	int ret;
 
 	if (!priv->dma_cap.eee)
 		return -EOPNOTSUPP;
@@ -920,17 +918,7 @@ static int stmmac_ethtool_op_set_eee(struct net_device *dev,
 	if (!edata->eee_enabled)
 		stmmac_disable_eee_mode(priv);
 
-	ret = phylink_ethtool_set_eee(priv->phylink, edata);
-	if (ret)
-		return ret;
-
-	if (edata->eee_enabled &&
-	    priv->tx_lpi_timer != edata->tx_lpi_timer) {
-		priv->tx_lpi_timer = edata->tx_lpi_timer;
-		stmmac_eee_init(priv);
-	}
-
-	return 0;
+	return phylink_ethtool_set_eee(priv->phylink, edata);
 }
 
 static u32 stmmac_usec2riwt(u32 usec, struct stmmac_priv *priv)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 2f518ec845ec..ddb79e8880e9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -469,7 +469,7 @@ static void stmmac_eee_ctrl_timer(struct timer_list *t)
  *  can also manage EEE, this function enable the LPI state and start related
  *  timer.
  */
-bool stmmac_eee_init(struct stmmac_priv *priv)
+static bool stmmac_eee_init(struct stmmac_priv *priv)
 {
 	int eee_tw_timer = priv->eee_tw_timer;
 
@@ -1088,6 +1088,7 @@ static void stmmac_mac_link_up(struct phylink_config *config,
 		priv->eee_active =
 			phy_init_eee(phy, !(priv->plat->flags &
 				STMMAC_FLAG_RX_CLK_RUNS_IN_LPI)) >= 0;
+		priv->tx_lpi_timer = phy->eee_cfg.tx_lpi_timer;
 		priv->eee_enabled = stmmac_eee_init(priv);
 		priv->tx_lpi_enabled = priv->eee_enabled;
 		stmmac_set_eee_pls(priv, priv->hw, true);
@@ -1187,6 +1188,16 @@ static int stmmac_init_phy(struct net_device *dev)
 		ret = phylink_fwnode_phy_connect(priv->phylink, fwnode, 0);
 	}
 
+	if (ret == 0) {
+		struct ethtool_keee eee;
+
+		/* Configure phylib's copy of the LPI timer */
+		if (phylink_ethtool_get_eee(priv->phylink, &eee)) {
+			eee.tx_lpi_timer = priv->tx_lpi_timer;
+			phylink_ethtool_set_eee(priv->phylink, &eee);
+		}
+	}
+
 	if (!priv->plat->pmt) {
 		struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
 
@@ -3446,10 +3457,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
 
 	priv->eee_tw_timer = STMMAC_DEFAULT_TWT_LS;
 
-	/* Convert the timer from msec to usec */
-	if (!priv->tx_lpi_timer)
-		priv->tx_lpi_timer = eee_timer * 1000;
-
 	if (priv->use_riwt) {
 		u32 queue;
 
@@ -3916,6 +3923,10 @@ static int __stmmac_open(struct net_device *dev,
 	u32 chan;
 	int ret;
 
+	/* Initialise the tx lpi timer, converting from msec to usec */
+	if (!priv->tx_lpi_timer)
+		priv->tx_lpi_timer = eee_timer * 1000;
+
 	ret = pm_runtime_resume_and_get(priv->device);
 	if (ret < 0)
 		return ret;
-- 
2.30.2

Re: [PATCH net-next v3 02/18] net: stmmac: move tx_lpi_timer tracking to phylib

[Choong Yong Liang]

On 8/1/2025 12:28 am, Russell King (Oracle) wrote:
> When stmmac_ethtool_op_get_eee() is called, stmmac sets the tx_lpi_timer
> and tx_lpi_enabled members, and then calls into phylink and thus phylib.
> phylib overwrites these members.
> 
> phylib will also cause a link down/link up transition when settings
> that impact the MAC have been changed.
> 
> Convert stmmac to use the tx_lpi_timer setting in struct phy_device,
> updating priv->tx_lpi_timer each time when the link comes up, rather
> than trying to maintain this user setting itself. We initialise the
> phylib tx_lpi_timer setting by doing a get_ee-modify-set_eee sequence
> with the last known priv->tx_lpi_timer value. In order for this to work
> correctly, we also need this member to be initialised earlier.
> 
> As stmmac_eee_init() is no longer called outside of stmmac_main.c, make
> it static.
> 
> Reviewed-by: Andrew Lunn <andrew@lunn.ch>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Hi Russell,

I have completed the sanity test on the EEE changes to the stmmac driver.

It seems that most of the changes are acceptable with respect to EEE behavior.

However, I noticed that this part of the code requires a minor change to 
fix the logic:

	/* Configure phylib's copy of the LPI timer */
	if (phylink_ethtool_get_eee(priv->phylink, &eee) == 0) {
		eee.tx_lpi_timer = priv->tx_lpi_timer;
		phylink_ethtool_set_eee(priv->phylink, &eee);
	}

Otherwise, the "tx_lpi_timer" will not be set correctly during the initial 
state.

Tested-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>

Re: [PATCH net-next v3 02/18] net: stmmac: move tx_lpi_timer tracking to phylib

[Russell King (Oracle)]

Hi,

On Wed, Jan 08, 2025 at 03:36:57PM +0800, Choong Yong Liang wrote:
> I have completed the sanity test on the EEE changes to the stmmac driver.
> 
> It seems that most of the changes are acceptable with respect to EEE behavior.
> 
> However, I noticed that this part of the code requires a minor change to fix
> the logic:
> 
> 	/* Configure phylib's copy of the LPI timer */
> 	if (phylink_ethtool_get_eee(priv->phylink, &eee) == 0) {
> 		eee.tx_lpi_timer = priv->tx_lpi_timer;
> 		phylink_ethtool_set_eee(priv->phylink, &eee);
> 	}
> 
> Otherwise, the "tx_lpi_timer" will not be set correctly during the initial
> state.
> 
> Tested-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>

Thanks for testing. I can't update the series as there has been a power
failure at home, hence the machine that has my git trees on is
inaccessible at the moment.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

Re: [PATCH net-next v3 02/18] net: stmmac: move tx_lpi_timer tracking to phylib

[Russell King (Oracle)]

Hi,

On Wed, Jan 08, 2025 at 03:36:57PM +0800, Choong Yong Liang wrote:
> Tested-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>

Please let me know if this is for the entire series.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

Re: [PATCH net-next v3 02/18] net: stmmac: move tx_lpi_timer tracking to phylib

[Choong Yong Liang]

On 8/1/2025 6:40 pm, Russell King (Oracle) wrote:
> Hi,
> 
> On Wed, Jan 08, 2025 at 03:36:57PM +0800, Choong Yong Liang wrote:
>> Tested-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>
> 
> Please let me know if this is for the entire series.
> 
> Thanks.
> 

Yes, the test is for the entire series.

The only issue that was discovered is that during the initial state, the 
"tx_lpi_timer" is not set correctly.
The "tx_lpi_timer" with a value of 0 causes the EEE to be unable to enter 
LPI mode.

[PATCH net-next v3 03/18] net: stmmac: use correct type for tx_lpi_timer

[Russell King (Oracle)]

The ethtool interface uses u32 for tx_lpi_timer, and so does phylib.
Use u32 to store this internally within stmmac rather than "int"
which could misinterpret large values.

Correct "value" in dwmac4_set_eee_lpi_entry_timer() to use u32
rather than int, which is derived from tx_lpi_timer. Even though this
path won't be used with values larger than STMMAC_ET_MAX, this brings
consistency of type usage to the stmmac code for this variable.

We leave eee_timer unchanged for now, with the assumption that values
up to INT_MAX will safely fit in a u32.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 4 ++--
 drivers/net/ethernet/stmicro/stmmac/hwif.h        | 2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac.h      | 2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++--
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index c36f90a782c5..9ed8620580a8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -420,10 +420,10 @@ static void dwmac4_set_eee_pls(struct mac_device_info *hw, int link)
 	writel(value, ioaddr + GMAC4_LPI_CTRL_STATUS);
 }
 
-static void dwmac4_set_eee_lpi_entry_timer(struct mac_device_info *hw, int et)
+static void dwmac4_set_eee_lpi_entry_timer(struct mac_device_info *hw, u32 et)
 {
 	void __iomem *ioaddr = hw->pcsr;
-	int value = et & STMMAC_ET_MAX;
+	u32 value = et & STMMAC_ET_MAX;
 	int regval;
 
 	/* Program LPI entry timer value into register */
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 2f7295b6c1c5..0f200b72c225 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -363,7 +363,7 @@ struct stmmac_ops {
 	void (*set_eee_mode)(struct mac_device_info *hw,
 			     bool en_tx_lpi_clockgating);
 	void (*reset_eee_mode)(struct mac_device_info *hw);
-	void (*set_eee_lpi_entry_timer)(struct mac_device_info *hw, int et);
+	void (*set_eee_lpi_entry_timer)(struct mac_device_info *hw, u32 et);
 	void (*set_eee_timer)(struct mac_device_info *hw, int ls, int tw);
 	void (*set_eee_pls)(struct mac_device_info *hw, int link);
 	void (*debug)(struct stmmac_priv *priv, void __iomem *ioaddr,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index df386fc948ec..984e708d019f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -307,7 +307,7 @@ struct stmmac_priv {
 	int lpi_irq;
 	int eee_enabled;
 	int eee_active;
-	int tx_lpi_timer;
+	u32 tx_lpi_timer;
 	int tx_lpi_enabled;
 	int eee_tw_timer;
 	bool eee_sw_timer_en;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index ddb79e8880e9..dbe5635398b3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -394,11 +394,11 @@ static inline u32 stmmac_rx_dirty(struct stmmac_priv *priv, u32 queue)
 
 static void stmmac_lpi_entry_timer_config(struct stmmac_priv *priv, bool en)
 {
-	int tx_lpi_timer;
+	u32 tx_lpi_timer;
 
 	/* Clear/set the SW EEE timer flag based on LPI ET enablement */
 	priv->eee_sw_timer_en = en ? 0 : 1;
-	tx_lpi_timer  = en ? priv->tx_lpi_timer : 0;
+	tx_lpi_timer = en ? priv->tx_lpi_timer : 0;
 	stmmac_set_eee_lpi_timer(priv, priv->hw, tx_lpi_timer);
 }
 
-- 
2.30.2

[PATCH net-next v3 04/18] net: stmmac: use unsigned int for eee_timer

[Russell King (Oracle)]

Since eee_timer is used to initialise priv->tx_lpi_timer, this also
should be unsigned to avoid a negative number being interpreted as a
very large positive number. Note that this makes the check for negative
numbers passed in as a module parameter redundant, and passing a
negative number will now produce a large delay rather than the
default. Since the default is used without an argument, passing a
negative number would be quite obscure. However, if users do, then
this will need to be revisited.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index dbe5635398b3..96393e6feda0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -111,8 +111,8 @@ static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
 				      NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);
 
 #define STMMAC_DEFAULT_LPI_TIMER	1000
-static int eee_timer = STMMAC_DEFAULT_LPI_TIMER;
-module_param(eee_timer, int, 0644);
+static unsigned int eee_timer = STMMAC_DEFAULT_LPI_TIMER;
+module_param(eee_timer, uint, 0644);
 MODULE_PARM_DESC(eee_timer, "LPI tx expiration time in msec");
 #define STMMAC_LPI_T(x) (jiffies + usecs_to_jiffies(x))
 
@@ -194,8 +194,6 @@ static void stmmac_verify_args(void)
 		flow_ctrl = FLOW_OFF;
 	if (unlikely((pause < 0) || (pause > 0xffff)))
 		pause = PAUSE_TIME;
-	if (eee_timer < 0)
-		eee_timer = STMMAC_DEFAULT_LPI_TIMER;
 }
 
 static void __stmmac_disable_all_queues(struct stmmac_priv *priv)
-- 
2.30.2

Re: [PATCH net-next v3 04/18] net: stmmac: use unsigned int for eee_timer

[Simon Horman]

On Tue, Jan 07, 2025 at 04:28:47PM +0000, Russell King (Oracle) wrote:
> Since eee_timer is used to initialise priv->tx_lpi_timer, this also
> should be unsigned to avoid a negative number being interpreted as a
> very large positive number. Note that this makes the check for negative
> numbers passed in as a module parameter redundant, and passing a
> negative number will now produce a large delay rather than the
> default. Since the default is used without an argument, passing a
> negative number would be quite obscure. However, if users do, then
> this will need to be revisited.
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Reviewed-by: Simon Horman <horms@kernel.org>

[PATCH net-next v3 05/18] net: stmmac: make EEE depend on phy->enable_tx_lpi

[Russell King (Oracle)]

Make stmmac EEE depend on phylib's evaluation of user settings and PHY
negotiation, as indicated by phy->enable_tx_lpi. This will ensure when
phylib has evaluated that the user has disabled LPI, phy_init_eee()
will not be called, and priv->eee_active will be false, causing LPI/EEE
to be disabled.

This is an interim measure - phy_init_eee() will be removed in a later
patch.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 96393e6feda0..3135bfdbee3c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1083,7 +1083,7 @@ static void stmmac_mac_link_up(struct phylink_config *config,
 
 	stmmac_mac_set(priv, priv->ioaddr, true);
 	if (phy && priv->dma_cap.eee) {
-		priv->eee_active =
+		priv->eee_active = phy->enable_tx_lpi &&
 			phy_init_eee(phy, !(priv->plat->flags &
 				STMMAC_FLAG_RX_CLK_RUNS_IN_LPI)) >= 0;
 		priv->tx_lpi_timer = phy->eee_cfg.tx_lpi_timer;
-- 
2.30.2

[PATCH net-next v3 06/18] net: stmmac: remove redundant code from ethtool EEE ops

[Russell King (Oracle)]

Setting edata->tx_lpi_enabled in stmmac_ethtool_op_get_eee() gets
overwritten by phylib, so there's no point setting this.

In stmmac_ethtool_op_set_eee(), now that stmmac is using the result of
phylib's evaluation of EEE, there is no need to handle anything in the
ethtool EEE ops other than calling through to the appropriate phylink
function, which will pass on to phylib the users request.

As stmmac_disable_eee_mode() is now no longer called from outside
stmmac_main.c, make it static.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h         | 1 -
 drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 9 ---------
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c    | 2 +-
 3 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 984e708d019f..2eee3c5c4d1e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -405,7 +405,6 @@ void stmmac_dvr_remove(struct device *dev);
 int stmmac_dvr_probe(struct device *device,
 		     struct plat_stmmacenet_data *plat_dat,
 		     struct stmmac_resources *res);
-void stmmac_disable_eee_mode(struct stmmac_priv *priv);
 int stmmac_reinit_queues(struct net_device *dev, u32 rx_cnt, u32 tx_cnt);
 int stmmac_reinit_ringparam(struct net_device *dev, u32 rx_size, u32 tx_size);
 int stmmac_bus_clks_config(struct stmmac_priv *priv, bool enabled);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 0429a99a8114..693f59c3c47a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -898,8 +898,6 @@ static int stmmac_ethtool_op_get_eee(struct net_device *dev,
 	if (!priv->dma_cap.eee)
 		return -EOPNOTSUPP;
 
-	edata->tx_lpi_enabled = priv->tx_lpi_enabled;
-
 	return phylink_ethtool_get_eee(priv->phylink, edata);
 }
 
@@ -911,13 +909,6 @@ static int stmmac_ethtool_op_set_eee(struct net_device *dev,
 	if (!priv->dma_cap.eee)
 		return -EOPNOTSUPP;
 
-	if (priv->tx_lpi_enabled != edata->tx_lpi_enabled)
-		netdev_warn(priv->dev,
-			    "Setting EEE tx-lpi is not supported\n");
-
-	if (!edata->eee_enabled)
-		stmmac_disable_eee_mode(priv);
-
 	return phylink_ethtool_set_eee(priv->phylink, edata);
 }
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 3135bfdbee3c..1ccfa40ceddd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -432,7 +432,7 @@ static int stmmac_enable_eee_mode(struct stmmac_priv *priv)
  * Description: this function is to exit and disable EEE in case of
  * LPI state is true. This is called by the xmit.
  */
-void stmmac_disable_eee_mode(struct stmmac_priv *priv)
+static void stmmac_disable_eee_mode(struct stmmac_priv *priv)
 {
 	if (!priv->eee_sw_timer_en) {
 		stmmac_lpi_entry_timer_config(priv, 0);
-- 
2.30.2

[PATCH net-next v3 07/18] net: stmmac: clean up stmmac_disable_eee_mode()

[Russell King (Oracle)]

stmmac_disable_eee_mode() is now only called from stmmac_xmit() when
both priv->tx_path_in_lpi_mode and priv->eee_sw_timer_en are true.
Therefore:

	if (!priv->eee_sw_timer_en)

in stmmac_disable_eee_mode() will never be true, so this is dead code.
Remove it, and rename the function to indicate that it now only deals
with software based EEE mode.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 1ccfa40ceddd..be77dd04c8c7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -427,18 +427,13 @@ static int stmmac_enable_eee_mode(struct stmmac_priv *priv)
 }
 
 /**
- * stmmac_disable_eee_mode - disable and exit from LPI mode
+ * stmmac_disable_sw_eee_mode - disable and exit from LPI mode
  * @priv: driver private structure
  * Description: this function is to exit and disable EEE in case of
  * LPI state is true. This is called by the xmit.
  */
-static void stmmac_disable_eee_mode(struct stmmac_priv *priv)
+static void stmmac_disable_sw_eee_mode(struct stmmac_priv *priv)
 {
-	if (!priv->eee_sw_timer_en) {
-		stmmac_lpi_entry_timer_config(priv, 0);
-		return;
-	}
-
 	stmmac_reset_eee_mode(priv, priv->hw);
 	del_timer_sync(&priv->eee_ctrl_timer);
 	priv->tx_path_in_lpi_mode = false;
@@ -4495,7 +4490,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 	first_tx = tx_q->cur_tx;
 
 	if (priv->tx_path_in_lpi_mode && priv->eee_sw_timer_en)
-		stmmac_disable_eee_mode(priv);
+		stmmac_disable_sw_eee_mode(priv);
 
 	/* Manage oversized TCP frames for GMAC4 device */
 	if (skb_is_gso(skb) && priv->tso) {
-- 
2.30.2

[PATCH net-next v3 08/18] net: stmmac: remove priv->tx_lpi_enabled

[Russell King (Oracle)]

Through using phylib's EEE state, priv->tx_lpi_enabled has become a
write-only variable. Remove it.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h      | 1 -
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 --
 2 files changed, 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 2eee3c5c4d1e..507b6ac14289 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -308,7 +308,6 @@ struct stmmac_priv {
 	int eee_enabled;
 	int eee_active;
 	u32 tx_lpi_timer;
-	int tx_lpi_enabled;
 	int eee_tw_timer;
 	bool eee_sw_timer_en;
 	unsigned int mode;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index be77dd04c8c7..fc80ed101a79 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -968,7 +968,6 @@ static void stmmac_mac_link_down(struct phylink_config *config,
 
 	stmmac_mac_set(priv, priv->ioaddr, false);
 	priv->eee_active = false;
-	priv->tx_lpi_enabled = false;
 	priv->eee_enabled = stmmac_eee_init(priv);
 	stmmac_set_eee_pls(priv, priv->hw, false);
 
@@ -1083,7 +1082,6 @@ static void stmmac_mac_link_up(struct phylink_config *config,
 				STMMAC_FLAG_RX_CLK_RUNS_IN_LPI)) >= 0;
 		priv->tx_lpi_timer = phy->eee_cfg.tx_lpi_timer;
 		priv->eee_enabled = stmmac_eee_init(priv);
-		priv->tx_lpi_enabled = priv->eee_enabled;
 		stmmac_set_eee_pls(priv, priv->hw, true);
 	}
 
-- 
2.30.2

[PATCH net-next v3 09/18] net: stmmac: report EEE error statistics if EEE is supported

[Russell King (Oracle)]

Report the number of EEE error statistics in the xstats even when EEE
is not enabled in hardware, but is supported. The PHY maintains this
counter even when EEE is not enabled.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 693f59c3c47a..918a32f8fda8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -654,7 +654,7 @@ static void stmmac_get_ethtool_stats(struct net_device *dev,
 					     (*(u32 *)p);
 			}
 		}
-		if (priv->eee_enabled) {
+		if (priv->dma_cap.eee) {
 			int val = phylink_get_eee_err(priv->phylink);
 			if (val)
 				priv->xstats.phy_eee_wakeup_error_n = val;
-- 
2.30.2

[PATCH net-next v3 10/18] net: stmmac: convert to use phy_eee_rx_clock_stop()

[Russell King (Oracle)]

Convert stmmac to use phy_eee_rx_clock_stop() to set the PHY receive
clock stop in LPI setting, rather than calling the legacy
phy_init_eee() function.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index fc80ed101a79..adc51087f2ba 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1077,10 +1077,10 @@ static void stmmac_mac_link_up(struct phylink_config *config,
 
 	stmmac_mac_set(priv, priv->ioaddr, true);
 	if (phy && priv->dma_cap.eee) {
-		priv->eee_active = phy->enable_tx_lpi &&
-			phy_init_eee(phy, !(priv->plat->flags &
-				STMMAC_FLAG_RX_CLK_RUNS_IN_LPI)) >= 0;
+		phy_eee_rx_clock_stop(phy, !(priv->plat->flags &
+					     STMMAC_FLAG_RX_CLK_RUNS_IN_LPI));
 		priv->tx_lpi_timer = phy->eee_cfg.tx_lpi_timer;
+		priv->eee_active = phy->enable_tx_lpi;
 		priv->eee_enabled = stmmac_eee_init(priv);
 		stmmac_set_eee_pls(priv, priv->hw, true);
 	}
-- 
2.30.2

[PATCH net-next v3 11/18] net: stmmac: remove priv->eee_tw_timer

[Russell King (Oracle)]

priv->eee_tw_timer is only assigned during initialisation to a
constant value (STMMAC_DEFAULT_TWT_LS) and then never changed.

Remove priv->eee_tw_timer, and instead use STMMAC_DEFAULT_TWT_LS
for both uses in stmmac_eee_init().

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h      | 1 -
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 9 +++------
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 507b6ac14289..1556804cca38 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -308,7 +308,6 @@ struct stmmac_priv {
 	int eee_enabled;
 	int eee_active;
 	u32 tx_lpi_timer;
-	int eee_tw_timer;
 	bool eee_sw_timer_en;
 	unsigned int mode;
 	unsigned int chain_mode;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index adc51087f2ba..94bb6b07f96f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -464,8 +464,6 @@ static void stmmac_eee_ctrl_timer(struct timer_list *t)
  */
 static bool stmmac_eee_init(struct stmmac_priv *priv)
 {
-	int eee_tw_timer = priv->eee_tw_timer;
-
 	/* Check if MAC core supports the EEE feature. */
 	if (!priv->dma_cap.eee)
 		return false;
@@ -478,7 +476,8 @@ static bool stmmac_eee_init(struct stmmac_priv *priv)
 			netdev_dbg(priv->dev, "disable EEE\n");
 			stmmac_lpi_entry_timer_config(priv, 0);
 			del_timer_sync(&priv->eee_ctrl_timer);
-			stmmac_set_eee_timer(priv, priv->hw, 0, eee_tw_timer);
+			stmmac_set_eee_timer(priv, priv->hw, 0,
+					     STMMAC_DEFAULT_TWT_LS);
 			if (priv->hw->xpcs)
 				xpcs_config_eee(priv->hw->xpcs,
 						priv->plat->mult_fact_100ns,
@@ -491,7 +490,7 @@ static bool stmmac_eee_init(struct stmmac_priv *priv)
 	if (priv->eee_active && !priv->eee_enabled) {
 		timer_setup(&priv->eee_ctrl_timer, stmmac_eee_ctrl_timer, 0);
 		stmmac_set_eee_timer(priv, priv->hw, STMMAC_DEFAULT_LIT_LS,
-				     eee_tw_timer);
+				     STMMAC_DEFAULT_TWT_LS);
 		if (priv->hw->xpcs)
 			xpcs_config_eee(priv->hw->xpcs,
 					priv->plat->mult_fact_100ns,
@@ -3446,8 +3445,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
 	else if (ptp_register)
 		stmmac_ptp_register(priv);
 
-	priv->eee_tw_timer = STMMAC_DEFAULT_TWT_LS;
-
 	if (priv->use_riwt) {
 		u32 queue;
 
-- 
2.30.2

[PATCH net-next v3 12/18] net: stmmac: move priv->eee_enabled into stmmac_eee_init()

[Russell King (Oracle)]

All call sites for stmmac_eee_init() assign the return code to
priv->eee_enabled. Rather than having this coded at each call site,
move the assignment inside stmmac_eee_init().

Since stmmac_init_eee() takes priv->lock before checking the state of
priv->eee_enabled, move the assignment within the locked region. Also,
stmmac_suspend() checks the state of this member under the lock. While
two concurrent calls to stmmac_init_eee() aren't possible, there is
a possibility that stmmac_suspend() may run concurrently with a change
of priv->eee_enabled unless we modify it under the lock.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c  | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 94bb6b07f96f..b7e0026c271b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -462,11 +462,13 @@ static void stmmac_eee_ctrl_timer(struct timer_list *t)
  *  can also manage EEE, this function enable the LPI state and start related
  *  timer.
  */
-static bool stmmac_eee_init(struct stmmac_priv *priv)
+static void stmmac_eee_init(struct stmmac_priv *priv)
 {
 	/* Check if MAC core supports the EEE feature. */
-	if (!priv->dma_cap.eee)
-		return false;
+	if (!priv->dma_cap.eee) {
+		priv->eee_enabled = false;
+		return;
+	}
 
 	mutex_lock(&priv->lock);
 
@@ -483,8 +485,9 @@ static bool stmmac_eee_init(struct stmmac_priv *priv)
 						priv->plat->mult_fact_100ns,
 						false);
 		}
+		priv->eee_enabled = false;
 		mutex_unlock(&priv->lock);
-		return false;
+		return;
 	}
 
 	if (priv->eee_active && !priv->eee_enabled) {
@@ -507,9 +510,10 @@ static bool stmmac_eee_init(struct stmmac_priv *priv)
 			  STMMAC_LPI_T(priv->tx_lpi_timer));
 	}
 
+	priv->eee_enabled = true;
+
 	mutex_unlock(&priv->lock);
 	netdev_dbg(priv->dev, "Energy-Efficient Ethernet initialized\n");
-	return true;
 }
 
 /* stmmac_get_tx_hwtstamp - get HW TX timestamps
@@ -967,7 +971,7 @@ static void stmmac_mac_link_down(struct phylink_config *config,
 
 	stmmac_mac_set(priv, priv->ioaddr, false);
 	priv->eee_active = false;
-	priv->eee_enabled = stmmac_eee_init(priv);
+	stmmac_eee_init(priv);
 	stmmac_set_eee_pls(priv, priv->hw, false);
 
 	if (stmmac_fpe_supported(priv))
@@ -1080,7 +1084,7 @@ static void stmmac_mac_link_up(struct phylink_config *config,
 					     STMMAC_FLAG_RX_CLK_RUNS_IN_LPI));
 		priv->tx_lpi_timer = phy->eee_cfg.tx_lpi_timer;
 		priv->eee_active = phy->enable_tx_lpi;
-		priv->eee_enabled = stmmac_eee_init(priv);
+		stmmac_eee_init(priv);
 		stmmac_set_eee_pls(priv, priv->hw, true);
 	}
 
-- 
2.30.2

[PATCH net-next v3 13/18] net: stmmac: move priv->eee_active into stmmac_eee_init()

[Russell King (Oracle)]

Since all call sites of stmmac_eee_init() assign priv->eee_active
immediately before, pass this state into stmmac_eee_init() and
assign priv->eee_active within this function.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index b7e0026c271b..7c1dbc5fa84b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -457,13 +457,16 @@ static void stmmac_eee_ctrl_timer(struct timer_list *t)
 /**
  * stmmac_eee_init - init EEE
  * @priv: driver private structure
+ * @active: indicates whether EEE should be enabled.
  * Description:
  *  if the GMAC supports the EEE (from the HW cap reg) and the phy device
  *  can also manage EEE, this function enable the LPI state and start related
  *  timer.
  */
-static void stmmac_eee_init(struct stmmac_priv *priv)
+static void stmmac_eee_init(struct stmmac_priv *priv, bool active)
 {
+	priv->eee_active = active;
+
 	/* Check if MAC core supports the EEE feature. */
 	if (!priv->dma_cap.eee) {
 		priv->eee_enabled = false;
@@ -970,8 +973,7 @@ static void stmmac_mac_link_down(struct phylink_config *config,
 	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
 
 	stmmac_mac_set(priv, priv->ioaddr, false);
-	priv->eee_active = false;
-	stmmac_eee_init(priv);
+	stmmac_eee_init(priv, false);
 	stmmac_set_eee_pls(priv, priv->hw, false);
 
 	if (stmmac_fpe_supported(priv))
@@ -1083,8 +1085,7 @@ static void stmmac_mac_link_up(struct phylink_config *config,
 		phy_eee_rx_clock_stop(phy, !(priv->plat->flags &
 					     STMMAC_FLAG_RX_CLK_RUNS_IN_LPI));
 		priv->tx_lpi_timer = phy->eee_cfg.tx_lpi_timer;
-		priv->eee_active = phy->enable_tx_lpi;
-		stmmac_eee_init(priv);
+		stmmac_eee_init(priv, phy->enable_tx_lpi);
 		stmmac_set_eee_pls(priv, priv->hw, true);
 	}
 
-- 
2.30.2

[PATCH net-next v3 14/18] net: stmmac: use boolean for eee_enabled and eee_active

[Russell King (Oracle)]

priv->eee_enabled and priv->eee_active are both assigned using boolean
values. Type them as bool rather than int.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 1556804cca38..25ad3f92e14d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -305,9 +305,9 @@ struct stmmac_priv {
 	int clk_csr;
 	struct timer_list eee_ctrl_timer;
 	int lpi_irq;
-	int eee_enabled;
-	int eee_active;
 	u32 tx_lpi_timer;
+	bool eee_enabled;
+	bool eee_active;
 	bool eee_sw_timer_en;
 	unsigned int mode;
 	unsigned int chain_mode;
-- 
2.30.2

[PATCH net-next v3 15/18] net: stmmac: move setup of eee_ctrl_timer to stmmac_dvr_probe()

[Russell King (Oracle)]

Move the initialisation of the EEE software timer to the probe function
as it is unnecessary to do this each time we enable software LPI.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 7c1dbc5fa84b..b003f462006d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -494,7 +494,6 @@ static void stmmac_eee_init(struct stmmac_priv *priv, bool active)
 	}
 
 	if (priv->eee_active && !priv->eee_enabled) {
-		timer_setup(&priv->eee_ctrl_timer, stmmac_eee_ctrl_timer, 0);
 		stmmac_set_eee_timer(priv, priv->hw, STMMAC_DEFAULT_LIT_LS,
 				     STMMAC_DEFAULT_TWT_LS);
 		if (priv->hw->xpcs)
@@ -7405,6 +7404,8 @@ int stmmac_dvr_probe(struct device *device,
 
 	INIT_WORK(&priv->service_task, stmmac_service_task);
 
+	timer_setup(&priv->eee_ctrl_timer, stmmac_eee_ctrl_timer, 0);
+
 	/* Override with kernel parameters if supplied XXX CRS XXX
 	 * this needs to have multiple instances
 	 */
-- 
2.30.2

[PATCH net-next v3 16/18] net: stmmac: remove unnecessary EEE handling in stmmac_release()

[Russell King (Oracle)]

phylink_stop() will cause phylink to call the mac_link_down() operation
before phylink_stop() returns. As mac_link_down() will call
stmmac_eee_init(false), this will set both priv->eee_active and
priv->eee_enabled to be false, deleting the eee_ctrl_timer if
priv->eee_enabled was previously set.

As stmmac_release() calls phylink_stop() before checking whether
priv->eee_enabled is true, this is a condition that can never be
satisfied, and thus the code within this if() block will never be
executed. Remove it.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index b003f462006d..0a1e2587f8c7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4033,11 +4033,6 @@ static int stmmac_release(struct net_device *dev)
 	/* Free the IRQ lines */
 	stmmac_free_irq(dev, REQ_IRQ_ERR_ALL, 0);
 
-	if (priv->eee_enabled) {
-		priv->tx_path_in_lpi_mode = false;
-		del_timer_sync(&priv->eee_ctrl_timer);
-	}
-
 	/* Stop TX/RX DMA and clear the descriptors */
 	stmmac_stop_all_dma(priv);
 
-- 
2.30.2

[PATCH net-next v3 17/18] net: stmmac: split hardware LPI timer control

[Russell King (Oracle)]

Provide stmmac_disable_hw_lpi_timer() and stmmac_enable_hw_lpi_timer()
to control the hardware transmit LPI timer.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c  | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 0a1e2587f8c7..5b2ce5305b4b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -390,14 +390,24 @@ static inline u32 stmmac_rx_dirty(struct stmmac_priv *priv, u32 queue)
 	return dirty;
 }
 
-static void stmmac_lpi_entry_timer_config(struct stmmac_priv *priv, bool en)
+static void stmmac_disable_hw_lpi_timer(struct stmmac_priv *priv)
+{
+	stmmac_set_eee_lpi_timer(priv, priv->hw, 0);
+}
+
+static void stmmac_enable_hw_lpi_timer(struct stmmac_priv *priv)
 {
-	u32 tx_lpi_timer;
+	stmmac_set_eee_lpi_timer(priv, priv->hw, priv->tx_lpi_timer);
+}
 
+static void stmmac_lpi_entry_timer_config(struct stmmac_priv *priv, bool en)
+{
 	/* Clear/set the SW EEE timer flag based on LPI ET enablement */
 	priv->eee_sw_timer_en = en ? 0 : 1;
-	tx_lpi_timer = en ? priv->tx_lpi_timer : 0;
-	stmmac_set_eee_lpi_timer(priv, priv->hw, tx_lpi_timer);
+	if (en)
+		stmmac_enable_hw_lpi_timer(priv);
+	else
+		stmmac_disable_hw_lpi_timer(priv);
 }
 
 /**
-- 
2.30.2

[PATCH net-next v3 18/18] net: stmmac: remove stmmac_lpi_entry_timer_config()

[Russell King (Oracle)]

Remove stmmac_lpi_entry_timer_config(), setting priv->eee_sw_timer_en
at the original call sites, and calling the appropriate
stmmac_xxx_hw_lpi_timer() function. No functional change.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 21 +++++++------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 5b2ce5305b4b..250e1e7df050 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -400,16 +400,6 @@ static void stmmac_enable_hw_lpi_timer(struct stmmac_priv *priv)
 	stmmac_set_eee_lpi_timer(priv, priv->hw, priv->tx_lpi_timer);
 }
 
-static void stmmac_lpi_entry_timer_config(struct stmmac_priv *priv, bool en)
-{
-	/* Clear/set the SW EEE timer flag based on LPI ET enablement */
-	priv->eee_sw_timer_en = en ? 0 : 1;
-	if (en)
-		stmmac_enable_hw_lpi_timer(priv);
-	else
-		stmmac_disable_hw_lpi_timer(priv);
-}
-
 /**
  * stmmac_enable_eee_mode - check and enter in LPI mode
  * @priv: driver private structure
@@ -489,7 +479,8 @@ static void stmmac_eee_init(struct stmmac_priv *priv, bool active)
 	if (!priv->eee_active) {
 		if (priv->eee_enabled) {
 			netdev_dbg(priv->dev, "disable EEE\n");
-			stmmac_lpi_entry_timer_config(priv, 0);
+			priv->eee_sw_timer_en = true;
+			stmmac_disable_hw_lpi_timer(priv);
 			del_timer_sync(&priv->eee_ctrl_timer);
 			stmmac_set_eee_timer(priv, priv->hw, 0,
 					     STMMAC_DEFAULT_TWT_LS);
@@ -513,11 +504,15 @@ static void stmmac_eee_init(struct stmmac_priv *priv, bool active)
 	}
 
 	if (priv->plat->has_gmac4 && priv->tx_lpi_timer <= STMMAC_ET_MAX) {
+		/* Use hardware LPI mode */
 		del_timer_sync(&priv->eee_ctrl_timer);
 		priv->tx_path_in_lpi_mode = false;
-		stmmac_lpi_entry_timer_config(priv, 1);
+		priv->eee_sw_timer_en = false;
+		stmmac_enable_hw_lpi_timer(priv);
 	} else {
-		stmmac_lpi_entry_timer_config(priv, 0);
+		/* Use software LPI mode */
+		priv->eee_sw_timer_en = true;
+		stmmac_disable_hw_lpi_timer(priv);
 		mod_timer(&priv->eee_ctrl_timer,
 			  STMMAC_LPI_T(priv->tx_lpi_timer));
 	}
-- 
2.30.2