[PATCH net-next v2 0/5] net: dsa: microchip: ksz8795: add Wake on LAN support

[PATCH net-next v2 0/5] net: dsa: microchip: ksz8795: add Wake on LAN support

[vtpieter]

From: Pieter Van Trappen <pieter.van.trappen@cern.ch>

Add WoL support for KSZ8795 family of switches. This code was tested
with a KSZ8794 chip.

Strongly based on existing KSZ9477 code which has now been moved to
ksz_common instead of duplicating, as proposed during the review of
the v1 version of this patch.

In addition to the device-tree addition and the actual code, there's
an additional patch to check the erratum workaround application using
the now available indirect register read.

Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>
---
v2:
 - generalize instead of duplicate, much improved
 - variable declaration reverse Christmas tree
 - ksz8_handle_global_errata: return -EIO in case of indirect write failure
 - ksz8_ind_read8/write8: document functions
 - ksz8_handle_wake_reason: no need for additional write to clear
 - fix wakeup_source origin comments
v1: https://lore.kernel.org/netdev/20240717193725.469192-1-vtpieter@gmail.com/

Pieter Van Trappen (5):
  dt-bindings: net: dsa: microchip: add microchip,pme-active-high flag
  net: dsa: microchip: move KSZ9477 WoL functions to ksz_common
  net: dsa: microchip: generalize KSZ9477 WoL functions at ksz_common
  net: dsa: microchip: add WoL support for KSZ87xx family
  net: dsa: microchip: check erratum workaround through indirect
    register read

 .../bindings/net/dsa/microchip,ksz.yaml       |   5 +
 drivers/net/dsa/microchip/ksz8.h              |   3 +
 drivers/net/dsa/microchip/ksz8795.c           |  99 +++++++-
 drivers/net/dsa/microchip/ksz8795_reg.h       |   4 +-
 drivers/net/dsa/microchip/ksz9477.c           | 195 +---------------
 drivers/net/dsa/microchip/ksz9477.h           |   5 -
 drivers/net/dsa/microchip/ksz9477_reg.h       |  12 -
 drivers/net/dsa/microchip/ksz_common.c        | 219 +++++++++++++++++-
 drivers/net/dsa/microchip/ksz_common.h        |  31 ++-
 9 files changed, 350 insertions(+), 223 deletions(-)


base-commit: 0a658d088cc63745528cf0ec8a2c2df0f37742d9
-- 
2.43.0

[PATCH net-next v2 1/5] dt-bindings: net: dsa: microchip: add microchip,pme-active-high flag

[vtpieter]

From: Pieter Van Trappen <pieter.van.trappen@cern.ch>

Add microchip,pme-active-high property to set the PME (Power
Management Event) pin polarity for Wake on Lan interrupts.

Note that the polarity is active-low by default.

Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml b/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
index 52acc15ebcbf..c589ebc2c7be 100644
--- a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
@@ -51,6 +51,11 @@ properties:
       Set if the output SYNCLKO clock should be disabled. Do not mix with
       microchip,synclko-125.
 
+  microchip,pme-active-high:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Indicates if the PME pin polarity is active-high.
+
   microchip,io-drive-strength-microamp:
     description:
       IO Pad Drive Strength
-- 
2.43.0

[PATCH net-next v2 2/5] net: dsa: microchip: move KSZ9477 WoL functions to ksz_common

[vtpieter]

From: Pieter Van Trappen <pieter.van.trappen@cern.ch>

Move KSZ9477 WoL functions to ksz_common, in preparation for adding
KSZ87xx family support.

Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>
---
 drivers/net/dsa/microchip/ksz9477.c    | 181 -------------------------
 drivers/net/dsa/microchip/ksz_common.c | 181 +++++++++++++++++++++++++
 2 files changed, 181 insertions(+), 181 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 425e20daf1e9..071d953a17e9 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -56,187 +56,6 @@ int ksz9477_change_mtu(struct ksz_device *dev, int port, int mtu)
 				  REG_SW_MTU_MASK, frame_size);
 }
 
-/**
- * ksz9477_handle_wake_reason - Handle wake reason on a specified port.
- * @dev: The device structure.
- * @port: The port number.
- *
- * This function reads the PME (Power Management Event) status register of a
- * specified port to determine the wake reason. If there is no wake event, it
- * returns early. Otherwise, it logs the wake reason which could be due to a
- * "Magic Packet", "Link Up", or "Energy Detect" event. The PME status register
- * is then cleared to acknowledge the handling of the wake event.
- *
- * Return: 0 on success, or an error code on failure.
- */
-static int ksz9477_handle_wake_reason(struct ksz_device *dev, int port)
-{
-	u8 pme_status;
-	int ret;
-
-	ret = ksz_pread8(dev, port, REG_PORT_PME_STATUS, &pme_status);
-	if (ret)
-		return ret;
-
-	if (!pme_status)
-		return 0;
-
-	dev_dbg(dev->dev, "Wake event on port %d due to:%s%s%s\n", port,
-		pme_status & PME_WOL_MAGICPKT ? " \"Magic Packet\"" : "",
-		pme_status & PME_WOL_LINKUP ? " \"Link Up\"" : "",
-		pme_status & PME_WOL_ENERGY ? " \"Energy detect\"" : "");
-
-	return ksz_pwrite8(dev, port, REG_PORT_PME_STATUS, pme_status);
-}
-
-/**
- * ksz9477_get_wol - Get Wake-on-LAN settings for a specified port.
- * @dev: The device structure.
- * @port: The port number.
- * @wol: Pointer to ethtool Wake-on-LAN settings structure.
- *
- * This function checks the PME Pin Control Register to see if  PME Pin Output
- * Enable is set, indicating PME is enabled. If enabled, it sets the supported
- * and active WoL flags.
- */
-void ksz9477_get_wol(struct ksz_device *dev, int port,
-		     struct ethtool_wolinfo *wol)
-{
-	u8 pme_ctrl;
-	int ret;
-
-	if (!dev->wakeup_source)
-		return;
-
-	wol->supported = WAKE_PHY;
-
-	/* Check if the current MAC address on this port can be set
-	 * as global for WAKE_MAGIC support. The result may vary
-	 * dynamically based on other ports configurations.
-	 */
-	if (ksz_is_port_mac_global_usable(dev->ds, port))
-		wol->supported |= WAKE_MAGIC;
-
-	ret = ksz_pread8(dev, port, REG_PORT_PME_CTRL, &pme_ctrl);
-	if (ret)
-		return;
-
-	if (pme_ctrl & PME_WOL_MAGICPKT)
-		wol->wolopts |= WAKE_MAGIC;
-	if (pme_ctrl & (PME_WOL_LINKUP | PME_WOL_ENERGY))
-		wol->wolopts |= WAKE_PHY;
-}
-
-/**
- * ksz9477_set_wol - Set Wake-on-LAN settings for a specified port.
- * @dev: The device structure.
- * @port: The port number.
- * @wol: Pointer to ethtool Wake-on-LAN settings structure.
- *
- * This function configures Wake-on-LAN (WoL) settings for a specified port.
- * It validates the provided WoL options, checks if PME is enabled via the
- * switch's PME Pin Control Register, clears any previous wake reasons,
- * and sets the Magic Packet flag in the port's PME control register if
- * specified.
- *
- * Return: 0 on success, or other error codes on failure.
- */
-int ksz9477_set_wol(struct ksz_device *dev, int port,
-		    struct ethtool_wolinfo *wol)
-{
-	u8 pme_ctrl = 0, pme_ctrl_old = 0;
-	bool magic_switched_off;
-	bool magic_switched_on;
-	int ret;
-
-	if (wol->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
-		return -EINVAL;
-
-	if (!dev->wakeup_source)
-		return -EOPNOTSUPP;
-
-	ret = ksz9477_handle_wake_reason(dev, port);
-	if (ret)
-		return ret;
-
-	if (wol->wolopts & WAKE_MAGIC)
-		pme_ctrl |= PME_WOL_MAGICPKT;
-	if (wol->wolopts & WAKE_PHY)
-		pme_ctrl |= PME_WOL_LINKUP | PME_WOL_ENERGY;
-
-	ret = ksz_pread8(dev, port, REG_PORT_PME_CTRL, &pme_ctrl_old);
-	if (ret)
-		return ret;
-
-	if (pme_ctrl_old == pme_ctrl)
-		return 0;
-
-	magic_switched_off = (pme_ctrl_old & PME_WOL_MAGICPKT) &&
-			    !(pme_ctrl & PME_WOL_MAGICPKT);
-	magic_switched_on = !(pme_ctrl_old & PME_WOL_MAGICPKT) &&
-			    (pme_ctrl & PME_WOL_MAGICPKT);
-
-	/* To keep reference count of MAC address, we should do this
-	 * operation only on change of WOL settings.
-	 */
-	if (magic_switched_on) {
-		ret = ksz_switch_macaddr_get(dev->ds, port, NULL);
-		if (ret)
-			return ret;
-	} else if (magic_switched_off) {
-		ksz_switch_macaddr_put(dev->ds);
-	}
-
-	ret = ksz_pwrite8(dev, port, REG_PORT_PME_CTRL, pme_ctrl);
-	if (ret) {
-		if (magic_switched_on)
-			ksz_switch_macaddr_put(dev->ds);
-		return ret;
-	}
-
-	return 0;
-}
-
-/**
- * ksz9477_wol_pre_shutdown - Prepares the switch device for shutdown while
- *                            considering Wake-on-LAN (WoL) settings.
- * @dev: The switch device structure.
- * @wol_enabled: Pointer to a boolean which will be set to true if WoL is
- *               enabled on any port.
- *
- * This function prepares the switch device for a safe shutdown while taking
- * into account the Wake-on-LAN (WoL) settings on the user ports. It updates
- * the wol_enabled flag accordingly to reflect whether WoL is active on any
- * port.
- */
-void ksz9477_wol_pre_shutdown(struct ksz_device *dev, bool *wol_enabled)
-{
-	struct dsa_port *dp;
-	int ret;
-
-	*wol_enabled = false;
-
-	if (!dev->wakeup_source)
-		return;
-
-	dsa_switch_for_each_user_port(dp, dev->ds) {
-		u8 pme_ctrl = 0;
-
-		ret = ksz_pread8(dev, dp->index, REG_PORT_PME_CTRL, &pme_ctrl);
-		if (!ret && pme_ctrl)
-			*wol_enabled = true;
-
-		/* make sure there are no pending wake events which would
-		 * prevent the device from going to sleep/shutdown.
-		 */
-		ksz9477_handle_wake_reason(dev, dp->index);
-	}
-
-	/* Now we are save to enable PME pin. */
-	if (*wol_enabled)
-		ksz_write8(dev, REG_SW_PME_CTRL, PME_ENABLE);
-}
-
 static int ksz9477_wait_vlan_ctrl_ready(struct ksz_device *dev)
 {
 	unsigned int val;
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index b074b4bb0629..41f89e2c6b2d 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -3740,6 +3740,44 @@ static void ksz_get_wol(struct dsa_switch *ds, int port,
 		dev->dev_ops->get_wol(dev, port, wol);
 }
 
+/**
+ * ksz9477_get_wol - Get Wake-on-LAN settings for a specified port.
+ * @dev: The device structure.
+ * @port: The port number.
+ * @wol: Pointer to ethtool Wake-on-LAN settings structure.
+ *
+ * This function checks the PME Pin Control Register to see if  PME Pin Output
+ * Enable is set, indicating PME is enabled. If enabled, it sets the supported
+ * and active WoL flags.
+ */
+void ksz9477_get_wol(struct ksz_device *dev, int port,
+		     struct ethtool_wolinfo *wol)
+{
+	u8 pme_ctrl;
+	int ret;
+
+	if (!dev->wakeup_source)
+		return;
+
+	wol->supported = WAKE_PHY;
+
+	/* Check if the current MAC address on this port can be set
+	 * as global for WAKE_MAGIC support. The result may vary
+	 * dynamically based on other ports configurations.
+	 */
+	if (ksz_is_port_mac_global_usable(dev->ds, port))
+		wol->supported |= WAKE_MAGIC;
+
+	ret = ksz_pread8(dev, port, REG_PORT_PME_CTRL, &pme_ctrl);
+	if (ret)
+		return;
+
+	if (pme_ctrl & PME_WOL_MAGICPKT)
+		wol->wolopts |= WAKE_MAGIC;
+	if (pme_ctrl & (PME_WOL_LINKUP | PME_WOL_ENERGY))
+		wol->wolopts |= WAKE_PHY;
+}
+
 static int ksz_set_wol(struct dsa_switch *ds, int port,
 		       struct ethtool_wolinfo *wol)
 {
@@ -3751,6 +3789,149 @@ static int ksz_set_wol(struct dsa_switch *ds, int port,
 	return -EOPNOTSUPP;
 }
 
+/**
+ * ksz9477_set_wol - Set Wake-on-LAN settings for a specified port.
+ * @dev: The device structure.
+ * @port: The port number.
+ * @wol: Pointer to ethtool Wake-on-LAN settings structure.
+ *
+ * This function configures Wake-on-LAN (WoL) settings for a specified port.
+ * It validates the provided WoL options, checks if PME is enabled via the
+ * switch's PME Pin Control Register, clears any previous wake reasons,
+ * and sets the Magic Packet flag in the port's PME control register if
+ * specified.
+ *
+ * Return: 0 on success, or other error codes on failure.
+ */
+int ksz9477_set_wol(struct ksz_device *dev, int port,
+		    struct ethtool_wolinfo *wol)
+{
+	u8 pme_ctrl = 0, pme_ctrl_old = 0;
+	bool magic_switched_off;
+	bool magic_switched_on;
+	int ret;
+
+	if (wol->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
+		return -EINVAL;
+
+	if (!dev->wakeup_source)
+		return -EOPNOTSUPP;
+
+	ret = ksz9477_handle_wake_reason(dev, port);
+	if (ret)
+		return ret;
+
+	if (wol->wolopts & WAKE_MAGIC)
+		pme_ctrl |= PME_WOL_MAGICPKT;
+	if (wol->wolopts & WAKE_PHY)
+		pme_ctrl |= PME_WOL_LINKUP | PME_WOL_ENERGY;
+
+	ret = ksz_pread8(dev, port, REG_PORT_PME_CTRL, &pme_ctrl_old);
+	if (ret)
+		return ret;
+
+	if (pme_ctrl_old == pme_ctrl)
+		return 0;
+
+	magic_switched_off = (pme_ctrl_old & PME_WOL_MAGICPKT) &&
+			    !(pme_ctrl & PME_WOL_MAGICPKT);
+	magic_switched_on = !(pme_ctrl_old & PME_WOL_MAGICPKT) &&
+			    (pme_ctrl & PME_WOL_MAGICPKT);
+
+	/* To keep reference count of MAC address, we should do this
+	 * operation only on change of WOL settings.
+	 */
+	if (magic_switched_on) {
+		ret = ksz_switch_macaddr_get(dev->ds, port, NULL);
+		if (ret)
+			return ret;
+	} else if (magic_switched_off) {
+		ksz_switch_macaddr_put(dev->ds);
+	}
+
+	ret = ksz_pwrite8(dev, port, REG_PORT_PME_CTRL, pme_ctrl);
+	if (ret) {
+		if (magic_switched_on)
+			ksz_switch_macaddr_put(dev->ds);
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * ksz9477_handle_wake_reason - Handle wake reason on a specified port.
+ * @dev: The device structure.
+ * @port: The port number.
+ *
+ * This function reads the PME (Power Management Event) status register of a
+ * specified port to determine the wake reason. If there is no wake event, it
+ * returns early. Otherwise, it logs the wake reason which could be due to a
+ * "Magic Packet", "Link Up", or "Energy Detect" event. The PME status register
+ * is then cleared to acknowledge the handling of the wake event.
+ *
+ * Return: 0 on success, or an error code on failure.
+ */
+static int ksz9477_handle_wake_reason(struct ksz_device *dev, int port)
+{
+	u8 pme_status;
+	int ret;
+
+	ret = ksz_pread8(dev, port, REG_PORT_PME_STATUS, &pme_status);
+	if (ret)
+		return ret;
+
+	if (!pme_status)
+		return 0;
+
+	dev_dbg(dev->dev, "Wake event on port %d due to:%s%s%s\n", port,
+		pme_status & PME_WOL_MAGICPKT ? " \"Magic Packet\"" : "",
+		pme_status & PME_WOL_LINKUP ? " \"Link Up\"" : "",
+		pme_status & PME_WOL_ENERGY ? " \"Energy detect\"" : "");
+
+	return ksz_pwrite8(dev, port, REG_PORT_PME_STATUS, pme_status);
+}
+
+/**
+ * ksz9477_wol_pre_shutdown - Prepares the switch device for shutdown while
+ *                            considering Wake-on-LAN (WoL) settings.
+ * @dev: The switch device structure.
+ * @wol_enabled: Pointer to a boolean which will be set to true if WoL is
+ *               enabled on any port.
+ *
+ * This function prepares the switch device for a safe shutdown while taking
+ * into account the Wake-on-LAN (WoL) settings on the user ports. It updates
+ * the wol_enabled flag accordingly to reflect whether WoL is active on any
+ * port.
+ */
+void ksz9477_wol_pre_shutdown(struct ksz_device *dev, bool *wol_enabled)
+{
+	struct dsa_port *dp;
+	int ret;
+
+	*wol_enabled = false;
+
+	if (!dev->wakeup_source)
+		return;
+
+	dsa_switch_for_each_user_port(dp, dev->ds) {
+		u8 pme_ctrl = 0;
+
+		ret = ksz_pread8(dev, dp->index, REG_PORT_PME_CTRL, &pme_ctrl);
+		if (!ret && pme_ctrl)
+			*wol_enabled = true;
+
+		/* make sure there are no pending wake events which would
+		 * prevent the device from going to sleep/shutdown.
+		 */
+		ksz9477_handle_wake_reason(dev, dp->index);
+	}
+
+	/* Now we are save to enable PME pin. */
+	if (*wol_enabled)
+		ksz_write8(dev, REG_SW_PME_CTRL, PME_ENABLE);
+}
+
 static int ksz_port_set_mac_address(struct dsa_switch *ds, int port,
 				    const unsigned char *addr)
 {
-- 
2.43.0

[PATCH net-next v2 3/5] net: dsa: microchip: generalize KSZ9477 WoL functions at ksz_common

[vtpieter]

From: Pieter Van Trappen <pieter.van.trappen@cern.ch>

Generalize KSZ9477 WoL functions at ksz_common. Move dedicated registers
and generic masks to existing structures & defines for that purpose.

Introduction of PME (port) read/write helper functions, which happen
to be the generic read/write for KSZ9477 but not for the incoming
KSZ87xx patch.

Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>
---
 drivers/net/dsa/microchip/ksz9477.c     |  14 +--
 drivers/net/dsa/microchip/ksz9477.h     |   5 --
 drivers/net/dsa/microchip/ksz9477_reg.h |  12 ---
 drivers/net/dsa/microchip/ksz_common.c  | 109 ++++++++++++------------
 drivers/net/dsa/microchip/ksz_common.h  |  27 ++++--
 5 files changed, 86 insertions(+), 81 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 071d953a17e9..a454a2e14a6b 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -1007,6 +1007,7 @@ void ksz9477_port_queue_split(struct ksz_device *dev, int port)
 
 void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port)
 {
+	const u16 *regs = dev->info->regs;
 	struct dsa_switch *ds = dev->ds;
 	u16 data16;
 	u8 member;
@@ -1051,12 +1052,12 @@ void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port)
 	ksz9477_port_acl_init(dev, port);
 
 	/* clear pending wake flags */
-	ksz9477_handle_wake_reason(dev, port);
+	ksz_handle_wake_reason(dev, port);
 
 	/* Disable all WoL options by default. Otherwise
 	 * ksz_switch_macaddr_get/put logic will not work properly.
 	 */
-	ksz_pwrite8(dev, port, REG_PORT_PME_CTRL, 0);
+	ksz_pwrite8(dev, port, regs[REG_PORT_PME_CTRL], 0);
 }
 
 void ksz9477_config_cpu_port(struct dsa_switch *ds)
@@ -1153,6 +1154,7 @@ int ksz9477_enable_stp_addr(struct ksz_device *dev)
 int ksz9477_setup(struct dsa_switch *ds)
 {
 	struct ksz_device *dev = ds->priv;
+	const u16 *regs = dev->info->regs;
 	int ret = 0;
 
 	ds->mtu_enforcement_ingress = true;
@@ -1183,11 +1185,11 @@ int ksz9477_setup(struct dsa_switch *ds)
 	/* enable global MIB counter freeze function */
 	ksz_cfg(dev, REG_SW_MAC_CTRL_6, SW_MIB_COUNTER_FREEZE, true);
 
-	/* Make sure PME (WoL) is not enabled. If requested, it will be
-	 * enabled by ksz9477_wol_pre_shutdown(). Otherwise, some PMICs do not
-	 * like PME events changes before shutdown.
+	/* Make sure PME (WoL) is not enabled. If requested, it will
+	 * be enabled by ksz_wol_pre_shutdown(). Otherwise, some PMICs
+	 * do not like PME events changes before shutdown.
 	 */
-	ksz_write8(dev, REG_SW_PME_CTRL, 0);
+	ksz_write8(dev, regs[REG_SW_PME_CTRL], 0);
 
 	return 0;
 }
diff --git a/drivers/net/dsa/microchip/ksz9477.h b/drivers/net/dsa/microchip/ksz9477.h
index 239a281da10b..d2166b0d881e 100644
--- a/drivers/net/dsa/microchip/ksz9477.h
+++ b/drivers/net/dsa/microchip/ksz9477.h
@@ -60,11 +60,6 @@ void ksz9477_switch_exit(struct ksz_device *dev);
 void ksz9477_port_queue_split(struct ksz_device *dev, int port);
 void ksz9477_hsr_join(struct dsa_switch *ds, int port, struct net_device *hsr);
 void ksz9477_hsr_leave(struct dsa_switch *ds, int port, struct net_device *hsr);
-void ksz9477_get_wol(struct ksz_device *dev, int port,
-		     struct ethtool_wolinfo *wol);
-int ksz9477_set_wol(struct ksz_device *dev, int port,
-		    struct ethtool_wolinfo *wol);
-void ksz9477_wol_pre_shutdown(struct ksz_device *dev, bool *wol_enabled);
 
 int ksz9477_port_acl_init(struct ksz_device *dev, int port);
 void ksz9477_port_acl_free(struct ksz_device *dev, int port);
diff --git a/drivers/net/dsa/microchip/ksz9477_reg.h b/drivers/net/dsa/microchip/ksz9477_reg.h
index d5354c600ea1..04235c22bf40 100644
--- a/drivers/net/dsa/microchip/ksz9477_reg.h
+++ b/drivers/net/dsa/microchip/ksz9477_reg.h
@@ -38,11 +38,6 @@
 #define SWITCH_REVISION_S		4
 #define SWITCH_RESET			0x01
 
-#define REG_SW_PME_CTRL			0x0006
-
-#define PME_ENABLE			BIT(1)
-#define PME_POLARITY			BIT(0)
-
 #define REG_GLOBAL_OPTIONS		0x000F
 
 #define SW_GIGABIT_ABLE			BIT(6)
@@ -807,13 +802,6 @@
 #define REG_PORT_AVB_SR_1_TYPE		0x0008
 #define REG_PORT_AVB_SR_2_TYPE		0x000A
 
-#define REG_PORT_PME_STATUS		0x0013
-#define REG_PORT_PME_CTRL		0x0017
-
-#define PME_WOL_MAGICPKT		BIT(2)
-#define PME_WOL_LINKUP			BIT(1)
-#define PME_WOL_ENERGY			BIT(0)
-
 #define REG_PORT_INT_STATUS		0x001B
 #define REG_PORT_INT_MASK		0x001F
 
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 41f89e2c6b2d..e5358da8cbeb 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -348,9 +348,9 @@ static const struct ksz_dev_ops ksz9477_dev_ops = {
 	.mdb_add = ksz9477_mdb_add,
 	.mdb_del = ksz9477_mdb_del,
 	.change_mtu = ksz9477_change_mtu,
-	.get_wol = ksz9477_get_wol,
-	.set_wol = ksz9477_set_wol,
-	.wol_pre_shutdown = ksz9477_wol_pre_shutdown,
+	.pme_write8 = ksz_write8,
+	.pme_pread8 = ksz_pread8,
+	.pme_pwrite8 = ksz_pwrite8,
 	.config_cpu_port = ksz9477_config_cpu_port,
 	.tc_cbs_set_cinc = ksz9477_tc_cbs_set_cinc,
 	.enable_stp_addr = ksz9477_enable_stp_addr,
@@ -539,6 +539,9 @@ static const u16 ksz9477_regs[] = {
 	[S_MULTICAST_CTRL]		= 0x0331,
 	[P_XMII_CTRL_0]			= 0x0300,
 	[P_XMII_CTRL_1]			= 0x0301,
+	[REG_SW_PME_CTRL]		= 0x0006,
+	[REG_PORT_PME_STATUS]		= 0x0013,
+	[REG_PORT_PME_CTRL]		= 0x0017,
 };
 
 static const u32 ksz9477_masks[] = {
@@ -3731,31 +3734,27 @@ static int ksz_setup_tc(struct dsa_switch *ds, int port,
 	}
 }
 
-static void ksz_get_wol(struct dsa_switch *ds, int port,
-			struct ethtool_wolinfo *wol)
-{
-	struct ksz_device *dev = ds->priv;
-
-	if (dev->dev_ops->get_wol)
-		dev->dev_ops->get_wol(dev, port, wol);
-}
-
 /**
- * ksz9477_get_wol - Get Wake-on-LAN settings for a specified port.
- * @dev: The device structure.
+ * ksz_get_wol - Get Wake-on-LAN settings for a specified port.
+ * @ds: The dsa_switch structure.
  * @port: The port number.
  * @wol: Pointer to ethtool Wake-on-LAN settings structure.
  *
- * This function checks the PME Pin Control Register to see if  PME Pin Output
- * Enable is set, indicating PME is enabled. If enabled, it sets the supported
- * and active WoL flags.
+ * This function checks the device PME wakeup_source flag and chip_id.
+ * If enabled and supported, it sets the supported and active WoL
+ * flags.
  */
-void ksz9477_get_wol(struct ksz_device *dev, int port,
-		     struct ethtool_wolinfo *wol)
+static void ksz_get_wol(struct dsa_switch *ds, int port,
+			struct ethtool_wolinfo *wol)
 {
+	struct ksz_device *dev = ds->priv;
+	const u16 *regs = dev->info->regs;
 	u8 pme_ctrl;
 	int ret;
 
+	if (!is_ksz9477(dev))
+		return;
+
 	if (!dev->wakeup_source)
 		return;
 
@@ -3768,7 +3767,8 @@ void ksz9477_get_wol(struct ksz_device *dev, int port,
 	if (ksz_is_port_mac_global_usable(dev->ds, port))
 		wol->supported |= WAKE_MAGIC;
 
-	ret = ksz_pread8(dev, port, REG_PORT_PME_CTRL, &pme_ctrl);
+	ret = dev->dev_ops->pme_pread8(dev, port, regs[REG_PORT_PME_CTRL],
+				       &pme_ctrl);
 	if (ret)
 		return;
 
@@ -3778,35 +3778,26 @@ void ksz9477_get_wol(struct ksz_device *dev, int port,
 		wol->wolopts |= WAKE_PHY;
 }
 
-static int ksz_set_wol(struct dsa_switch *ds, int port,
-		       struct ethtool_wolinfo *wol)
-{
-	struct ksz_device *dev = ds->priv;
-
-	if (dev->dev_ops->set_wol)
-		return dev->dev_ops->set_wol(dev, port, wol);
-
-	return -EOPNOTSUPP;
-}
-
 /**
- * ksz9477_set_wol - Set Wake-on-LAN settings for a specified port.
- * @dev: The device structure.
+ * ksz_set_wol - Set Wake-on-LAN settings for a specified port.
+ * @ds: The dsa_switch structure.
  * @port: The port number.
  * @wol: Pointer to ethtool Wake-on-LAN settings structure.
  *
- * This function configures Wake-on-LAN (WoL) settings for a specified port.
- * It validates the provided WoL options, checks if PME is enabled via the
- * switch's PME Pin Control Register, clears any previous wake reasons,
- * and sets the Magic Packet flag in the port's PME control register if
+ * This function configures Wake-on-LAN (WoL) settings for a specified
+ * port. It validates the provided WoL options, checks if PME is
+ * enabled and supported, clears any previous wake reasons, and sets
+ * the Magic Packet flag in the port's PME control register if
  * specified.
  *
  * Return: 0 on success, or other error codes on failure.
  */
-int ksz9477_set_wol(struct ksz_device *dev, int port,
-		    struct ethtool_wolinfo *wol)
+static int ksz_set_wol(struct dsa_switch *ds, int port,
+		       struct ethtool_wolinfo *wol)
 {
 	u8 pme_ctrl = 0, pme_ctrl_old = 0;
+	struct ksz_device *dev = ds->priv;
+	const u16 *regs = dev->info->regs;
 	bool magic_switched_off;
 	bool magic_switched_on;
 	int ret;
@@ -3814,10 +3805,13 @@ int ksz9477_set_wol(struct ksz_device *dev, int port,
 	if (wol->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
 		return -EINVAL;
 
+	if (!is_ksz9477(dev))
+		return -EOPNOTSUPP;
+
 	if (!dev->wakeup_source)
 		return -EOPNOTSUPP;
 
-	ret = ksz9477_handle_wake_reason(dev, port);
+	ret = ksz_handle_wake_reason(dev, port);
 	if (ret)
 		return ret;
 
@@ -3826,7 +3820,8 @@ int ksz9477_set_wol(struct ksz_device *dev, int port,
 	if (wol->wolopts & WAKE_PHY)
 		pme_ctrl |= PME_WOL_LINKUP | PME_WOL_ENERGY;
 
-	ret = ksz_pread8(dev, port, REG_PORT_PME_CTRL, &pme_ctrl_old);
+	ret = dev->dev_ops->pme_pread8(dev, port, regs[REG_PORT_PME_CTRL],
+				       &pme_ctrl_old);
 	if (ret)
 		return ret;
 
@@ -3849,7 +3844,8 @@ int ksz9477_set_wol(struct ksz_device *dev, int port,
 		ksz_switch_macaddr_put(dev->ds);
 	}
 
-	ret = ksz_pwrite8(dev, port, REG_PORT_PME_CTRL, pme_ctrl);
+	ret = dev->dev_ops->pme_pwrite8(dev, port, regs[REG_PORT_PME_CTRL],
+					pme_ctrl);
 	if (ret) {
 		if (magic_switched_on)
 			ksz_switch_macaddr_put(dev->ds);
@@ -3860,7 +3856,7 @@ int ksz9477_set_wol(struct ksz_device *dev, int port,
 }
 
 /**
- * ksz9477_handle_wake_reason - Handle wake reason on a specified port.
+ * ksz_handle_wake_reason - Handle wake reason on a specified port.
  * @dev: The device structure.
  * @port: The port number.
  *
@@ -3872,12 +3868,14 @@ int ksz9477_set_wol(struct ksz_device *dev, int port,
  *
  * Return: 0 on success, or an error code on failure.
  */
-static int ksz9477_handle_wake_reason(struct ksz_device *dev, int port)
+int ksz_handle_wake_reason(struct ksz_device *dev, int port)
 {
+	const u16 *regs = dev->info->regs;
 	u8 pme_status;
 	int ret;
 
-	ret = ksz_pread8(dev, port, REG_PORT_PME_STATUS, &pme_status);
+	ret = dev->dev_ops->pme_pread8(dev, port, regs[REG_PORT_PME_STATUS],
+				       &pme_status);
 	if (ret)
 		return ret;
 
@@ -3889,11 +3887,12 @@ static int ksz9477_handle_wake_reason(struct ksz_device *dev, int port)
 		pme_status & PME_WOL_LINKUP ? " \"Link Up\"" : "",
 		pme_status & PME_WOL_ENERGY ? " \"Energy detect\"" : "");
 
-	return ksz_pwrite8(dev, port, REG_PORT_PME_STATUS, pme_status);
+	return dev->dev_ops->pme_pwrite8(dev, port, regs[REG_PORT_PME_STATUS],
+					 pme_status);
 }
 
 /**
- * ksz9477_wol_pre_shutdown - Prepares the switch device for shutdown while
+ * ksz_wol_pre_shutdown - Prepares the switch device for shutdown while
  *                            considering Wake-on-LAN (WoL) settings.
  * @dev: The switch device structure.
  * @wol_enabled: Pointer to a boolean which will be set to true if WoL is
@@ -3904,32 +3903,37 @@ static int ksz9477_handle_wake_reason(struct ksz_device *dev, int port)
  * the wol_enabled flag accordingly to reflect whether WoL is active on any
  * port.
  */
-void ksz9477_wol_pre_shutdown(struct ksz_device *dev, bool *wol_enabled)
+static void ksz_wol_pre_shutdown(struct ksz_device *dev, bool *wol_enabled)
 {
+	const u16 *regs = dev->info->regs;
 	struct dsa_port *dp;
 	int ret;
 
 	*wol_enabled = false;
 
+	if (!is_ksz9477(dev))
+		return;
+
 	if (!dev->wakeup_source)
 		return;
 
 	dsa_switch_for_each_user_port(dp, dev->ds) {
 		u8 pme_ctrl = 0;
 
-		ret = ksz_pread8(dev, dp->index, REG_PORT_PME_CTRL, &pme_ctrl);
+		ret = dev->dev_ops->pme_pread8(dev, dp->index,
+					       regs[REG_PORT_PME_CTRL], &pme_ctrl);
 		if (!ret && pme_ctrl)
 			*wol_enabled = true;
 
 		/* make sure there are no pending wake events which would
 		 * prevent the device from going to sleep/shutdown.
 		 */
-		ksz9477_handle_wake_reason(dev, dp->index);
+		ksz_handle_wake_reason(dev, dp->index);
 	}
 
 	/* Now we are save to enable PME pin. */
 	if (*wol_enabled)
-		ksz_write8(dev, REG_SW_PME_CTRL, PME_ENABLE);
+		dev->dev_ops->pme_write8(dev, regs[REG_SW_PME_CTRL], PME_ENABLE);
 }
 
 static int ksz_port_set_mac_address(struct dsa_switch *ds, int port,
@@ -4237,8 +4241,7 @@ void ksz_switch_shutdown(struct ksz_device *dev)
 {
 	bool wol_enabled = false;
 
-	if (dev->dev_ops->wol_pre_shutdown)
-		dev->dev_ops->wol_pre_shutdown(dev, &wol_enabled);
+	ksz_wol_pre_shutdown(dev, &wol_enabled);
 
 	if (dev->dev_ops->reset && !wol_enabled)
 		dev->dev_ops->reset(dev);
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 5f0a628b9849..c60c218afa64 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -235,6 +235,9 @@ enum ksz_regs {
 	S_MULTICAST_CTRL,
 	P_XMII_CTRL_0,
 	P_XMII_CTRL_1,
+	REG_SW_PME_CTRL,
+	REG_PORT_PME_STATUS,
+	REG_PORT_PME_CTRL,
 };
 
 enum ksz_masks {
@@ -354,6 +357,11 @@ struct ksz_dev_ops {
 	void (*get_caps)(struct ksz_device *dev, int port,
 			 struct phylink_config *config);
 	int (*change_mtu)(struct ksz_device *dev, int port, int mtu);
+	int (*pme_write8)(struct ksz_device *dev, u32 reg, u8 value);
+	int (*pme_pread8)(struct ksz_device *dev, int port, int offset,
+			  u8 *data);
+	int (*pme_pwrite8)(struct ksz_device *dev, int port, int offset,
+			   u8 data);
 	void (*freeze_mib)(struct ksz_device *dev, int port, bool freeze);
 	void (*port_init_cnt)(struct ksz_device *dev, int port);
 	void (*phylink_mac_link_up)(struct ksz_device *dev, int port,
@@ -363,11 +371,6 @@ struct ksz_dev_ops {
 				    int duplex, bool tx_pause, bool rx_pause);
 	void (*setup_rgmii_delay)(struct ksz_device *dev, int port);
 	int (*tc_cbs_set_cinc)(struct ksz_device *dev, int port, u32 val);
-	void (*get_wol)(struct ksz_device *dev, int port,
-			struct ethtool_wolinfo *wol);
-	int (*set_wol)(struct ksz_device *dev, int port,
-		       struct ethtool_wolinfo *wol);
-	void (*wol_pre_shutdown)(struct ksz_device *dev, bool *wol_enabled);
 	void (*config_cpu_port)(struct dsa_switch *ds);
 	int (*enable_stp_addr)(struct ksz_device *dev);
 	int (*reset)(struct ksz_device *dev);
@@ -391,6 +394,7 @@ int ksz_switch_macaddr_get(struct dsa_switch *ds, int port,
 			   struct netlink_ext_ack *extack);
 void ksz_switch_macaddr_put(struct dsa_switch *ds);
 void ksz_switch_shutdown(struct ksz_device *dev);
+int ksz_handle_wake_reason(struct ksz_device *dev, int port);
 
 /* Common register access functions */
 static inline struct regmap *ksz_regmap_8(struct ksz_device *dev)
@@ -629,6 +633,11 @@ static inline bool is_ksz8(struct ksz_device *dev)
 	return ksz_is_ksz87xx(dev) || ksz_is_ksz88x3(dev);
 }
 
+static inline bool is_ksz9477(struct ksz_device *dev)
+{
+	return dev->chip_id == KSZ9477_CHIP_ID;
+}
+
 static inline int is_lan937x(struct ksz_device *dev)
 {
 	return dev->chip_id == LAN9370_CHIP_ID ||
@@ -695,6 +704,14 @@ static inline bool is_lan937x_tx_phy(struct ksz_device *dev, int port)
 #define P_MII_MAC_MODE			BIT(2)
 #define P_MII_SEL_M			0x3
 
+/* KSZ9477, KSZ8795 Wake-on-LAN (WoL) masks */
+#define PME_WOL_MAGICPKT		BIT(2)
+#define PME_WOL_LINKUP			BIT(1)
+#define PME_WOL_ENERGY			BIT(0)
+
+#define PME_ENABLE			BIT(1)
+#define PME_POLARITY			BIT(0)
+
 /* Interrupt */
 #define REG_SW_PORT_INT_STATUS__1	0x001B
 #define REG_SW_PORT_INT_MASK__1		0x001F
-- 
2.43.0

[PATCH net-next v2 4/5] net: dsa: microchip: add WoL support for KSZ87xx family

[vtpieter]

From: Pieter Van Trappen <pieter.van.trappen@cern.ch>

Add WoL support for KSZ87xx family of switches. This code was tested
with a KSZ8794 chip.

Implement ksz_common usage of the new device-tree property
'microchip,pme-active-high'.

Make use of the now generalized ksz_common WoL functions, adding an
additional interrupt register write for KSZ87xx. Add helper functions
to convert from PME (port) read/writes to indirect register
read/writes in the dedicated ksz8795 sources.  Add initial
configuration during (port) setup as per KSZ9477.

Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>
---
 drivers/net/dsa/microchip/ksz8.h       |  3 +
 drivers/net/dsa/microchip/ksz8795.c    | 86 ++++++++++++++++++++++++++
 drivers/net/dsa/microchip/ksz_common.c | 29 ++++++---
 drivers/net/dsa/microchip/ksz_common.h |  4 ++
 4 files changed, 115 insertions(+), 7 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8.h b/drivers/net/dsa/microchip/ksz8.h
index ae43077e76c3..e1c79ff97123 100644
--- a/drivers/net/dsa/microchip/ksz8.h
+++ b/drivers/net/dsa/microchip/ksz8.h
@@ -54,6 +54,9 @@ int ksz8_reset_switch(struct ksz_device *dev);
 int ksz8_switch_init(struct ksz_device *dev);
 void ksz8_switch_exit(struct ksz_device *dev);
 int ksz8_change_mtu(struct ksz_device *dev, int port, int mtu);
+int ksz8_pme_write8(struct ksz_device *dev, u32 reg, u8 value);
+int ksz8_pme_pread8(struct ksz_device *dev, int port, int offset, u8 *data);
+int ksz8_pme_pwrite8(struct ksz_device *dev, int port, int offset, u8 data);
 void ksz8_phylink_mac_link_up(struct phylink_config *config,
 			      struct phy_device *phydev, unsigned int mode,
 			      phy_interface_t interface, int speed, int duplex,
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index d27b9c36d73f..8fe423044109 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -38,6 +38,20 @@ static void ksz_port_cfg(struct ksz_device *dev, int port, int offset, u8 bits,
 			   bits, set ? bits : 0);
 }
 
+/**
+ * ksz8_ind_write8 - EEE/ACL/PME indirect register write
+ * @dev: The device structure.
+ * @table: Function & table select, register 110.
+ * @addr: Indirect access control, register 111.
+ * @data: The data to be written.
+ *
+ * This function performs an indirect register write for EEE, ACL or
+ * PME switch functionalities. Both 8-bit registers 110 and 111 are
+ * written at once with ksz_write16, using the serial multiple write
+ * functionality.
+ *
+ * Return: 0 on success, or an error code on failure.
+ */
 static int ksz8_ind_write8(struct ksz_device *dev, u8 table, u16 addr, u8 data)
 {
 	const u16 *regs;
@@ -58,6 +72,59 @@ static int ksz8_ind_write8(struct ksz_device *dev, u8 table, u16 addr, u8 data)
 	return ret;
 }
 
+/**
+ * ksz8_ind_read8 - EEE/ACL/PME indirect register read
+ * @dev: The device structure.
+ * @table: Function & table select, register 110.
+ * @addr: Indirect access control, register 111.
+ * @val: The value read.
+ *
+ * This function performs an indirect register read for EEE, ACL or
+ * PME switch functionalities. Both 8-bit registers 110 and 111 are
+ * written at once with ksz_write16, using the serial multiple write
+ * functionality.
+ *
+ * Return: 0 on success, or an error code on failure.
+ */
+static int ksz8_ind_read8(struct ksz_device *dev, u8 table, u16 addr, u8 *val)
+{
+	const u16 *regs;
+	u16 ctrl_addr;
+	int ret = 0;
+
+	regs = dev->info->regs;
+
+	mutex_lock(&dev->alu_mutex);
+
+	ctrl_addr = IND_ACC_TABLE(table | TABLE_READ) | addr;
+	ret = ksz_write16(dev, regs[REG_IND_CTRL_0], ctrl_addr);
+	if (!ret)
+		ret = ksz_read8(dev, regs[REG_IND_BYTE], val);
+
+	mutex_unlock(&dev->alu_mutex);
+
+	return ret;
+}
+
+int ksz8_pme_write8(struct ksz_device *dev, u32 reg, u8 value)
+{
+	return ksz8_ind_write8(dev, (u8)(reg >> 8), (u8)(reg), value);
+}
+
+int ksz8_pme_pread8(struct ksz_device *dev, int port, int offset, u8 *data)
+{
+	u8 table = (u8)(offset >> 8 | (port + 1));
+
+	return ksz8_ind_read8(dev, table, (u8)(offset), data);
+}
+
+int ksz8_pme_pwrite8(struct ksz_device *dev, int port, int offset, u8 data)
+{
+	u8 table = (u8)(offset >> 8 | (port + 1));
+
+	return ksz8_ind_write8(dev, table, (u8)(offset), data);
+}
+
 int ksz8_reset_switch(struct ksz_device *dev)
 {
 	if (ksz_is_ksz88x3(dev)) {
@@ -1545,6 +1612,7 @@ static void ksz8795_cpu_interface_select(struct ksz_device *dev, int port)
 
 void ksz8_port_setup(struct ksz_device *dev, int port, bool cpu_port)
 {
+	const u16 *regs = dev->info->regs;
 	struct dsa_switch *ds = dev->ds;
 	const u32 *masks;
 	int queues;
@@ -1575,6 +1643,13 @@ void ksz8_port_setup(struct ksz_device *dev, int port, bool cpu_port)
 		member = BIT(dsa_upstream_port(ds, port));
 
 	ksz8_cfg_port_member(dev, port, member);
+
+	/* Disable all WoL options by default. Otherwise
+	 * ksz_switch_macaddr_get/put logic will not work properly.
+	 * CPU port 4 has no WoL functionality.
+	 */
+	if (ksz_is_ksz87xx(dev) && !cpu_port)
+		ksz8_pme_pwrite8(dev, port, regs[REG_PORT_PME_CTRL], 0);
 }
 
 static void ksz88x3_config_rmii_clk(struct ksz_device *dev)
@@ -1790,6 +1865,7 @@ int ksz8_enable_stp_addr(struct ksz_device *dev)
 int ksz8_setup(struct dsa_switch *ds)
 {
 	struct ksz_device *dev = ds->priv;
+	const u16 *regs = dev->info->regs;
 	int i;
 
 	ds->mtu_enforcement_ingress = true;
@@ -1829,6 +1905,16 @@ int ksz8_setup(struct dsa_switch *ds)
 	for (i = 0; i < (dev->info->num_vlans / 4); i++)
 		ksz8_r_vlan_entries(dev, i);
 
+	/* Make sure PME (WoL) is not enabled. If requested, it will
+	 * be enabled by ksz_wol_pre_shutdown(). Otherwise, some PMICs
+	 * do not like PME events changes before shutdown. PME only
+	 * available on KSZ87xx family.
+	 */
+	if (ksz_is_ksz87xx(dev)) {
+		ksz8_pme_write8(dev, regs[REG_SW_PME_CTRL], 0);
+		ksz_rmw8(dev, REG_INT_ENABLE, INT_PME, 0);
+	}
+
 	return ksz8_handle_global_errata(ds);
 }
 
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index e5358da8cbeb..02595ac10934 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -307,6 +307,9 @@ static const struct ksz_dev_ops ksz8_dev_ops = {
 	.init = ksz8_switch_init,
 	.exit = ksz8_switch_exit,
 	.change_mtu = ksz8_change_mtu,
+	.pme_write8 = ksz8_pme_write8,
+	.pme_pread8 = ksz8_pme_pread8,
+	.pme_pwrite8 = ksz8_pme_pwrite8,
 };
 
 static void ksz9477_phylink_mac_link_up(struct phylink_config *config,
@@ -423,6 +426,9 @@ static const u16 ksz8795_regs[] = {
 	[S_MULTICAST_CTRL]		= 0x04,
 	[P_XMII_CTRL_0]			= 0x06,
 	[P_XMII_CTRL_1]			= 0x06,
+	[REG_SW_PME_CTRL]		= 0x8003,
+	[REG_PORT_PME_STATUS]		= 0x8003,
+	[REG_PORT_PME_CTRL]		= 0x8007,
 };
 
 static const u32 ksz8795_masks[] = {
@@ -3752,7 +3758,7 @@ static void ksz_get_wol(struct dsa_switch *ds, int port,
 	u8 pme_ctrl;
 	int ret;
 
-	if (!is_ksz9477(dev))
+	if (!is_ksz9477(dev) && !ksz_is_ksz87xx(dev))
 		return;
 
 	if (!dev->wakeup_source)
@@ -3805,7 +3811,7 @@ static int ksz_set_wol(struct dsa_switch *ds, int port,
 	if (wol->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
 		return -EINVAL;
 
-	if (!is_ksz9477(dev))
+	if (!is_ksz9477(dev) && !ksz_is_ksz87xx(dev))
 		return -EOPNOTSUPP;
 
 	if (!dev->wakeup_source)
@@ -3905,13 +3911,15 @@ int ksz_handle_wake_reason(struct ksz_device *dev, int port)
  */
 static void ksz_wol_pre_shutdown(struct ksz_device *dev, bool *wol_enabled)
 {
+	const struct ksz_dev_ops *ops = dev->dev_ops;
 	const u16 *regs = dev->info->regs;
+	u8 pme_pin_en = PME_ENABLE;
 	struct dsa_port *dp;
 	int ret;
 
 	*wol_enabled = false;
 
-	if (!is_ksz9477(dev))
+	if (!is_ksz9477(dev) && !ksz_is_ksz87xx(dev))
 		return;
 
 	if (!dev->wakeup_source)
@@ -3920,8 +3928,8 @@ static void ksz_wol_pre_shutdown(struct ksz_device *dev, bool *wol_enabled)
 	dsa_switch_for_each_user_port(dp, dev->ds) {
 		u8 pme_ctrl = 0;
 
-		ret = dev->dev_ops->pme_pread8(dev, dp->index,
-					       regs[REG_PORT_PME_CTRL], &pme_ctrl);
+		ret = ops->pme_pread8(dev, dp->index,
+				      regs[REG_PORT_PME_CTRL], &pme_ctrl);
 		if (!ret && pme_ctrl)
 			*wol_enabled = true;
 
@@ -3932,8 +3940,13 @@ static void ksz_wol_pre_shutdown(struct ksz_device *dev, bool *wol_enabled)
 	}
 
 	/* Now we are save to enable PME pin. */
-	if (*wol_enabled)
-		dev->dev_ops->pme_write8(dev, regs[REG_SW_PME_CTRL], PME_ENABLE);
+	if (*wol_enabled) {
+		if (dev->pme_active_high)
+			pme_pin_en |= PME_POLARITY;
+		ops->pme_write8(dev, regs[REG_SW_PME_CTRL], pme_pin_en);
+		if (ksz_is_ksz87xx(dev))
+			ksz_write8(dev, KSZ8795_REG_INT_EN, KSZ8795_INT_PME_MASK);
+	}
 }
 
 static int ksz_port_set_mac_address(struct dsa_switch *ds, int port,
@@ -4643,6 +4656,8 @@ int ksz_switch_register(struct ksz_device *dev)
 
 		dev->wakeup_source = of_property_read_bool(dev->dev->of_node,
 							   "wakeup-source");
+		dev->pme_active_high = of_property_read_bool(dev->dev->of_node,
+							     "microchip,pme-active-high");
 	}
 
 	ret = dsa_register_switch(dev->ds);
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index c60c218afa64..c0b93825726d 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -174,6 +174,7 @@ struct ksz_device {
 	bool synclko_125;
 	bool synclko_disable;
 	bool wakeup_source;
+	bool pme_active_high;
 
 	struct vlan_table *vlan_cache;
 
@@ -712,6 +713,9 @@ static inline bool is_lan937x_tx_phy(struct ksz_device *dev, int port)
 #define PME_ENABLE			BIT(1)
 #define PME_POLARITY			BIT(0)
 
+#define KSZ8795_REG_INT_EN		0x7D
+#define KSZ8795_INT_PME_MASK		BIT(4)
+
 /* Interrupt */
 #define REG_SW_PORT_INT_STATUS__1	0x001B
 #define REG_SW_PORT_INT_MASK__1		0x001F
-- 
2.43.0

[PATCH net-next v2 5/5] net: dsa: microchip: check erratum workaround through indirect register read

[vtpieter]

From: Pieter Van Trappen <pieter.van.trappen@cern.ch>

Check the erratum workaround application which ensures in addition
that indirect register write and read work as expected.

Commit b7fb7729c94f ("net: dsa: microchip: fix register write order in
ksz8_ind_write8()") would have been found faster like this.

Also fix the register naming as in the datasheet.

Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>
---
 drivers/net/dsa/microchip/ksz8795.c     | 13 +++++++++++--
 drivers/net/dsa/microchip/ksz8795_reg.h |  4 ++--
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 8fe423044109..187301fe94c9 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -1834,6 +1834,7 @@ void ksz8_phylink_mac_link_up(struct phylink_config *config,
 static int ksz8_handle_global_errata(struct dsa_switch *ds)
 {
 	struct ksz_device *dev = ds->priv;
+	u8 data = 0xff;
 	int ret = 0;
 
 	/* KSZ87xx Errata DS80000687C.
@@ -1842,8 +1843,16 @@ static int ksz8_handle_global_errata(struct dsa_switch *ds)
 	 *   KSZ879x/KSZ877x/KSZ876x and some EEE link partners may result in
 	 *   the link dropping.
 	 */
-	if (dev->info->ksz87xx_eee_link_erratum)
-		ret = ksz8_ind_write8(dev, TABLE_EEE, REG_IND_EEE_GLOB2_HI, 0);
+	if (dev->info->ksz87xx_eee_link_erratum) {
+		ret = ksz8_ind_write8(dev, TABLE_EEE, REG_IND_EEE_GLOB2_LO, 0);
+		if (!ret)
+			ret = ksz8_ind_read8(dev, TABLE_EEE, REG_IND_EEE_GLOB2_LO, &data);
+	}
+
+	if (!ret && data) {
+		dev_err(dev->dev, "failed to disable EEE next page exchange (erratum)\n");
+		return -EIO;
+	}
 
 	return ret;
 }
diff --git a/drivers/net/dsa/microchip/ksz8795_reg.h b/drivers/net/dsa/microchip/ksz8795_reg.h
index 69566a5d9cda..cc6cac97c369 100644
--- a/drivers/net/dsa/microchip/ksz8795_reg.h
+++ b/drivers/net/dsa/microchip/ksz8795_reg.h
@@ -764,8 +764,8 @@
 #define IND_ACC_TABLE(table)		((table) << 8)
 
 /* */
-#define REG_IND_EEE_GLOB2_LO		0x34
-#define REG_IND_EEE_GLOB2_HI		0x35
+#define REG_IND_EEE_GLOB2_HI		0x34
+#define REG_IND_EEE_GLOB2_LO		0x35
 
 /**
  * MIB_COUNTER_VALUE			00-00000000-3FFFFFFF
-- 
2.43.0

Re: [PATCH net-next v2 2/5] net: dsa: microchip: move KSZ9477 WoL functions to ksz_common

[Simon Horman]

On Wed, Jul 31, 2024 at 12:34:00PM +0200, vtpieter@gmail.com wrote:
> From: Pieter Van Trappen <pieter.van.trappen@cern.ch>
> 
> Move KSZ9477 WoL functions to ksz_common, in preparation for adding
> KSZ87xx family support.
> 
> Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>

Hi Pieter,

This is not a full review, and I suggest waiting for feedback from others.

However, I think this patch-set needs to be re-arranged a little,
perhaps by bringing forward some of the header file changes
in the following patch forward, either into this patch
or a new patch before it.

In any case, the driver does not compile with this patch applied,
f.e. W=1 build using allmodconfig on x86_64. While it does
compile just fine when the following patch is applied.

-- 
pw-bot: changes-requested

Re: [PATCH net-next v2 2/5] net: dsa: microchip: move KSZ9477 WoL functions to ksz_common

[Pieter]

Le mer. 31 juil. 2024 à 22:10, Simon Horman <horms@kernel.org> a écrit :
>
> On Wed, Jul 31, 2024 at 12:34:00PM +0200, vtpieter@gmail.com wrote:
> > From: Pieter Van Trappen <pieter.van.trappen@cern.ch>
> >
> > Move KSZ9477 WoL functions to ksz_common, in preparation for adding
> > KSZ87xx family support.
> >
> > Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>
>
> Hi Pieter,
>
> This is not a full review, and I suggest waiting for feedback from others.
>
> However, I think this patch-set needs to be re-arranged a little,
> perhaps by bringing forward some of the header file changes
> in the following patch forward, either into this patch
> or a new patch before it.

Hi Simon, thanks indeed I missed this! It seems difficult to respect both
patch requirements [1] for this case:
 * One significant exception is when moving code from one file to another --
   in this case you should not modify the moved code at all in the same patch
   which moves it.
* When dividing your change into a series of patches, take special care to
  ensure that the kernel builds and runs properly after each patch in
the series.

I can make it compile but by moving the code, the KSZ9477 WoL part obviously
won't run properly anymore. Any suggestion how to tackle this?

[1] : https://docs.kernel.org/process/submitting-patches.html

>
> In any case, the driver does not compile with this patch applied,
> f.e. W=1 build using allmodconfig on x86_64. While it does
> compile just fine when the following patch is applied.
>
> --
> pw-bot: changes-requested

Re: [PATCH net-next v2 4/5] net: dsa: microchip: add WoL support for KSZ87xx family

[Arun.Ramadoss]

Hi Pieter, 


> 
> +/**
> + * ksz8_ind_write8 - EEE/ACL/PME indirect register write
> + * @dev: The device structure.
> + * @table: Function & table select, register 110.
> + * @addr: Indirect access control, register 111.
> + * @data: The data to be written.
> + *
> + * This function performs an indirect register write for EEE, ACL or
> + * PME switch functionalities. Both 8-bit registers 110 and 111 are
> + * written at once with ksz_write16, using the serial multiple write
> + * functionality.
> + *
> + * Return: 0 on success, or an error code on failure.
> + */
>  static int ksz8_ind_write8(struct ksz_device *dev, u8 table, u16
> addr, u8 data)
>  {
>         const u16 *regs;
> @@ -58,6 +72,59 @@ static int ksz8_ind_write8(struct ksz_device *dev,
> u8 table, u16 addr, u8 data)
>         return ret;
>  }
> 
> 
>  int ksz8_reset_switch(struct ksz_device *dev)
>  {
>         if (ksz_is_ksz88x3(dev)) {
> @@ -1545,6 +1612,7 @@ static void ksz8795_cpu_interface_select(struct
> ksz_device *dev, int port)
> 
>  void ksz8_port_setup(struct ksz_device *dev, int port, bool
> cpu_port)
>  {
> +       const u16 *regs = dev->info->regs;
>         struct dsa_switch *ds = dev->ds;
>         const u32 *masks;
>         int queues;
> @@ -1575,6 +1643,13 @@ void ksz8_port_setup(struct ksz_device *dev,
> int port, bool cpu_port)
>                 member = BIT(dsa_upstream_port(ds, port));
> 
>         ksz8_cfg_port_member(dev, port, member);
> +
> +       /* Disable all WoL options by default. Otherwise
> +        * ksz_switch_macaddr_get/put logic will not work properly.
> +        * CPU port 4 has no WoL functionality.
> +        */
> +       if (ksz_is_ksz87xx(dev) && !cpu_port)
> +               ksz8_pme_pwrite8(dev, port, regs[REG_PORT_PME_CTRL], 

check the return value of register write.

> 0);
>  }
> 
>  static void ksz88x3_config_rmii_clk(struct ksz_device *dev)
> @@ -1790,6 +1865,7 @@ int ksz8_enable_stp_addr(struct ksz_device
> *dev)
>  int ksz8_setup(struct dsa_switch *ds)
>  {
>         struct ksz_device *dev = ds->priv;
> +       const u16 *regs = dev->info->regs;
>         int i;
> 
>         ds->mtu_enforcement_ingress = true;
> @@ -1829,6 +1905,16 @@ int ksz8_setup(struct dsa_switch *ds)
>         for (i = 0; i < (dev->info->num_vlans / 4); i++)
>                 ksz8_r_vlan_entries(dev, i);
> 
> +       /* Make sure PME (WoL) is not enabled. If requested, it will
> +        * be enabled by ksz_wol_pre_shutdown(). Otherwise, some
> PMICs
> +        * do not like PME events changes before shutdown. PME only
> +        * available on KSZ87xx family.
> +        */
> +       if (ksz_is_ksz87xx(dev)) {
> +               ksz8_pme_write8(dev, regs[REG_SW_PME_CTRL], 0);
> +               ksz_rmw8(dev, REG_INT_ENABLE, INT_PME, 0);

Here also.
> +       }
> +
>         return ksz8_handle_global_errata(ds);
>  }
> 
> 
> 
>  static const u32 ksz8795_masks[] = {
> @@ -3752,7 +3758,7 @@ static void ksz_get_wol(struct dsa_switch *ds,
> int port,
>         u8 pme_ctrl;
>         int ret;
> 
> -       if (!is_ksz9477(dev))
> +       if (!is_ksz9477(dev) && !ksz_is_ksz87xx(dev))
>                 return;
> 
>         if (!dev->wakeup_source)
> @@ -3805,7 +3811,7 @@ static int ksz_set_wol(struct dsa_switch *ds,
> int port,
>         if (wol->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
>                 return -EINVAL;
> 
> -       if (!is_ksz9477(dev))
> +       if (!is_ksz9477(dev) && !ksz_is_ksz87xx(dev))
>                 return -EOPNOTSUPP;
> 
>         if (!dev->wakeup_source)
> @@ -3905,13 +3911,15 @@ int ksz_handle_wake_reason(struct ksz_device
> *dev, int port)
>   */
>  static void ksz_wol_pre_shutdown(struct ksz_device *dev, bool
> *wol_enabled)
>  {
> +       const struct ksz_dev_ops *ops = dev->dev_ops;

This change could be introduced in previous patch itself. 

>         const u16 *regs = dev->info->regs;
> +       u8 pme_pin_en = PME_ENABLE;
>         struct dsa_port *dp;
>         int ret;
> 
>         *wol_enabled = false;
> 
> -       if (!is_ksz9477(dev))
> +       if (!is_ksz9477(dev) && !ksz_is_ksz87xx(dev))
>                 return;
> 
>         if (!dev->wakeup_source)
> @@ -3920,8 +3928,8 @@ static void ksz_wol_pre_shutdown(struct
> ksz_device *dev, bool *wol_enabled)
>         dsa_switch_for_each_user_port(dp, dev->ds) {
>                 u8 pme_ctrl = 0;
> 
> -               ret = dev->dev_ops->pme_pread8(dev, dp->index,
> -                                              regs[REG_PORT_PME_CTRL
> ], &pme_ctrl);
> +               ret = ops->pme_pread8(dev, dp->index,
> +                                     regs[REG_PORT_PME_CTRL],
> &pme_ctrl);
>                 if (!ret && pme_ctrl)
>                         *wol_enabled = true;
> 
> @@ -3932,8 +3940,13 @@ static void ksz_wol_pre_shutdown(struct
> ksz_device *dev, bool *wol_enabled)
>         }
> 
>         /* Now we are save to enable PME pin. */
> -       if (*wol_enabled)
> -               dev->dev_ops->pme_write8(dev, regs[REG_SW_PME_CTRL],
> PME_ENABLE);
> +       if (*wol_enabled) {
> +               if (dev->pme_active_high)
> +                       pme_pin_en |= PME_POLARITY;
> +               ops->pme_write8(dev, regs[REG_SW_PME_CTRL],
> pme_pin_en);
> +               if (ksz_is_ksz87xx(dev))
> +                       ksz_write8(dev, KSZ8795_REG_INT_EN,
> KSZ8795_INT_PME_MASK);

check the return values. 
> +       }
>  }
> 
> 
>         ret = dsa_register_switch(dev->ds);
> diff --git a/drivers/net/dsa/microchip/ksz_common.h
> b/drivers/net/dsa/microchip/ksz_common.h
> index c60c218afa64..c0b93825726d 100644
> --- a/drivers/net/dsa/microchip/ksz_common.h
> +++ b/drivers/net/dsa/microchip/ksz_common.h
> @@ -174,6 +174,7 @@ struct ksz_device {
>         bool synclko_125;
>         bool synclko_disable;
>         bool wakeup_source;
> +       bool pme_active_high;
> 
>         struct vlan_table *vlan_cache;
> 
> @@ -712,6 +713,9 @@ static inline bool is_lan937x_tx_phy(struct
> ksz_device *dev, int port)
>  #define PME_ENABLE                     BIT(1)
>  #define PME_POLARITY                   BIT(0)
> 
> +#define KSZ8795_REG_INT_EN             0x7D
> +#define KSZ8795_INT_PME_MASK           BIT(4)
> +
>  /* Interrupt */
>  #define REG_SW_PORT_INT_STATUS__1      0x001B
>  #define REG_SW_PORT_INT_MASK__1                0x001F
> --
> 2.43.0
> 

Re: [PATCH net-next v2 3/5] net: dsa: microchip: generalize KSZ9477 WoL functions at ksz_common

[Arun.Ramadoss]

Hi Pieter, 


> 
>  void ksz9477_port_setup(struct ksz_device *dev, int port, bool
> cpu_port)
>  {
> +       const u16 *regs = dev->info->regs;
>         struct dsa_switch *ds = dev->ds;
>         u16 data16;
>         u8 member;
> @@ -1051,12 +1052,12 @@ void ksz9477_port_setup(struct ksz_device
> *dev, int port, bool cpu_port)
>         ksz9477_port_acl_init(dev, port);
> 
>         /* clear pending wake flags */
> -       ksz9477_handle_wake_reason(dev, port);
> +       ksz_handle_wake_reason(dev, port);
> 
>         /* Disable all WoL options by default. Otherwise
>          * ksz_switch_macaddr_get/put logic will not work properly.
>          */
> -       ksz_pwrite8(dev, port, REG_PORT_PME_CTRL, 0);
> +       ksz_pwrite8(dev, port, regs[REG_PORT_PME_CTRL], 0);

check the return value.

>  }
> 
>  void ksz9477_config_cpu_port(struct dsa_switch *ds)
> @@ -1153,6 +1154,7 @@ int ksz9477_enable_stp_addr(struct ksz_device
> *dev)
>  int ksz9477_setup(struct dsa_switch *ds)
>  {
>         struct ksz_device *dev = ds->priv;
> +       const u16 *regs = dev->info->regs;
>         int ret = 0;
> 
>         ds->mtu_enforcement_ingress = true;
> @@ -1183,11 +1185,11 @@ int ksz9477_setup(struct dsa_switch *ds)
>         /* enable global MIB counter freeze function */
>         ksz_cfg(dev, REG_SW_MAC_CTRL_6, SW_MIB_COUNTER_FREEZE, true);
> 
> -       /* Make sure PME (WoL) is not enabled. If requested, it will
> be
> -        * enabled by ksz9477_wol_pre_shutdown(). Otherwise, some
> PMICs do not
> -        * like PME events changes before shutdown.
> +       /* Make sure PME (WoL) is not enabled. If requested, it will
> +        * be enabled by ksz_wol_pre_shutdown(). Otherwise, some
> PMICs
> +        * do not like PME events changes before shutdown.
>          */
> -       ksz_write8(dev, REG_SW_PME_CTRL, 0);
> +       ksz_write8(dev, regs[REG_SW_PME_CTRL], 0);

here also.

> 
>         return 0;
>  }
> 
> 

Re: [PATCH net-next v2 3/5] net: dsa: microchip: generalize KSZ9477 WoL functions at ksz_common

[Pieter]

Hi Arun,

> > @@ -1051,12 +1052,12 @@ void ksz9477_port_setup(struct ksz_device
> > *dev, int port, bool cpu_port)
> >         ksz9477_port_acl_init(dev, port);
> >
> >         /* clear pending wake flags */
> > -       ksz9477_handle_wake_reason(dev, port);
> > +       ksz_handle_wake_reason(dev, port);
> >
> >         /* Disable all WoL options by default. Otherwise
> >          * ksz_switch_macaddr_get/put logic will not work properly.
> >          */
> > -       ksz_pwrite8(dev, port, REG_PORT_PME_CTRL, 0);
> > +       ksz_pwrite8(dev, port, regs[REG_PORT_PME_CTRL], 0);
>
> check the return value.

Thanks but since it's a void function, I cannot pass a non-zero return value
so is there a point checking it?

>
> >  }
> >
> >  void ksz9477_config_cpu_port(struct dsa_switch *ds)
> > @@ -1153,6 +1154,7 @@ int ksz9477_enable_stp_addr(struct ksz_device
> > *dev)
> >  int ksz9477_setup(struct dsa_switch *ds)
> >  {
> >         struct ksz_device *dev = ds->priv;
> > +       const u16 *regs = dev->info->regs;
> >         int ret = 0;
> >
> >         ds->mtu_enforcement_ingress = true;
> > @@ -1183,11 +1185,11 @@ int ksz9477_setup(struct dsa_switch *ds)
> >         /* enable global MIB counter freeze function */
> >         ksz_cfg(dev, REG_SW_MAC_CTRL_6, SW_MIB_COUNTER_FREEZE, true);
> >
> > -       /* Make sure PME (WoL) is not enabled. If requested, it will
> > be
> > -        * enabled by ksz9477_wol_pre_shutdown(). Otherwise, some
> > PMICs do not
> > -        * like PME events changes before shutdown.
> > +       /* Make sure PME (WoL) is not enabled. If requested, it will
> > +        * be enabled by ksz_wol_pre_shutdown(). Otherwise, some
> > PMICs
> > +        * do not like PME events changes before shutdown.
> >          */
> > -       ksz_write8(dev, REG_SW_PME_CTRL, 0);
> > +       ksz_write8(dev, regs[REG_SW_PME_CTRL], 0);
>
> here also.

Thanks will do.

Cheers, Pieter

Re: [PATCH net-next v2 2/5] net: dsa: microchip: move KSZ9477 WoL functions to ksz_common

[Oleksij Rempel]

Hi Pieter,

On Thu, Aug 01, 2024 at 08:45:03AM +0200, Pieter wrote:
> Le mer. 31 juil. 2024 à 22:10, Simon Horman <horms@kernel.org> a écrit :
> >
> > On Wed, Jul 31, 2024 at 12:34:00PM +0200, vtpieter@gmail.com wrote:
> > > From: Pieter Van Trappen <pieter.van.trappen@cern.ch>
> > >
> > > Move KSZ9477 WoL functions to ksz_common, in preparation for adding
> > > KSZ87xx family support.
> > >
> > > Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>
> >
> > Hi Pieter,
> >
> > This is not a full review, and I suggest waiting for feedback from others.
> >
> > However, I think this patch-set needs to be re-arranged a little,
> > perhaps by bringing forward some of the header file changes
> > in the following patch forward, either into this patch
> > or a new patch before it.
> 
> Hi Simon, thanks indeed I missed this! It seems difficult to respect both
> patch requirements [1] for this case:
>  * One significant exception is when moving code from one file to another --
>    in this case you should not modify the moved code at all in the same patch
>    which moves it.
> * When dividing your change into a series of patches, take special care to
>   ensure that the kernel builds and runs properly after each patch in
> the series.
> 
> I can make it compile but by moving the code, the KSZ9477 WoL part obviously
> won't run properly anymore. Any suggestion how to tackle this?
> 
> [1] : https://docs.kernel.org/process/submitting-patches.html

I see two options:
1. Add some minimal changes in the header files and describe the changes
in commit message.
2. Do code refactoring which is done in patch 3, before code is moved
around.

In any case, every step should compile.

Regards,
Oleksij
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Re: [PATCH net-next v2 5/5] net: dsa: microchip: check erratum workaround through indirect register read

[Oleksij Rempel]

Hi Pieter,

On Wed, Jul 31, 2024 at 12:34:03PM +0200, vtpieter@gmail.com wrote:
> From: Pieter Van Trappen <pieter.van.trappen@cern.ch>
> 
> Check the erratum workaround application which ensures in addition
> that indirect register write and read work as expected.

> Commit b7fb7729c94f ("net: dsa: microchip: fix register write order in
> ksz8_ind_write8()") would have been found faster like this.

No. It would be not found faster, because there are nearly no active
users/develpers participating in the development/testing of this part of
the driver. I still do not have access to any KSZ879x variant and the
initial erratum fix was done on request without ability to actually
test it on my side. You seems to be the first one for long time making
something for this series :)

The strategy to re-read configs after writing them is also not
consequent in the driver and would not really help here too. It will
show you an error only if the driver is accidentally writing to a
read-only register.

> Also fix the register naming as in the datasheet.
> 
> Signed-off-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>

Nacked-by: Oleksij Rempel <o.rempel@pengutronix.de>

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |