diff --git a/drivers/net/dsa/microchip/ksz8.h b/drivers/net/dsa/microchip/ksz8.h
index 9a286d73e9cf..ae43077e76c3 100644
--- a/drivers/net/dsa/microchip/ksz8.h
+++ b/drivers/net/dsa/microchip/ksz8.h
@@ -58,5 +58,6 @@ 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,
 			      bool tx_pause, bool rx_pause);
+int ksz8_all_queues_split(struct ksz_device *dev, int queues);
 
 #endif
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 51b8ffe5a61f..95f5a5a9898c 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -179,6 +179,21 @@ static int ksz8_port_queue_split(struct ksz_device *dev, int port, int queues)
 	return ksz_prmw8(dev, port, reg_2q, mask_2q, data_2q);
 }
 
+int ksz8_all_queues_split(struct ksz_device *dev, int queues)
+{
+	struct dsa_switch *ds = dev->ds;
+	const struct dsa_port *dp;
+
+	dsa_switch_for_each_port(dp, ds) {
+		int ret = ksz8_port_queue_split(dev, dp->index, queues);
+
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 void ksz8_r_mib_cnt(struct ksz_device *dev, int port, u16 addr, u64 *cnt)
 {
 	const u32 *masks;
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index a0ae9dffa133..42f445aef9c9 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -19,6 +19,9 @@
 #include "ksz_ptp.h"
 
 #define KSZ_MAX_NUM_PORTS 8
+/* all KSZ switches count ports from 1 */
+#define KSZ_PORT_1 0
+#define KSZ_PORT_2 1
 
 struct ksz_device;
 struct ksz_port;
diff --git a/drivers/net/dsa/microchip/ksz_dcb.c b/drivers/net/dsa/microchip/ksz_dcb.c
index de46329ed6e8..80fb322de8f7 100644
--- a/drivers/net/dsa/microchip/ksz_dcb.c
+++ b/drivers/net/dsa/microchip/ksz_dcb.c
@@ -82,6 +82,10 @@ static const u8 ksz_supported_apptrust[] = {
 	IEEE_8021QAZ_APP_SEL_DSCP,
 };
 
+static const u8 ksz8_port2_supported_apptrust[] = {
+	DCB_APP_SEL_PCP,
+};
+
 static const char * const ksz_supported_apptrust_variants[] = {
 	"empty", "dscp", "pcp", "dscp pcp"
 };
@@ -181,6 +185,49 @@ int ksz_port_get_default_prio(struct dsa_switch *ds, int port)
 	return (data & mask) >> shift;
 }
 
+/**
+ * ksz88x3_port_set_default_prio_quirks - Quirks for default priority
+ * @dev: Pointer to the KSZ switch device structure
+ * @port: Port number for which to set the default priority
+ * @prio: Priority value to set
+ *
+ * This function implements quirks for setting the default priority on KSZ88x3
+ * devices. On Port 2, no other priority providers are working
+ * except of PCP. So, configuring default priority on Port 2 is not possible.
+ * On Port 1, it is not possible to configure port priority if PCP
+ * apptrust on Port 2 is disabled. Since we disable multiple queues on the
+ * switch to disable PCP on Port 2, we need to ensure that the default priority
+ * configuration on Port 1 is in agreement with the configuration on Port 2.
+ *
+ * Return: 0 on success, or a negative error code on failure
+ */
+static int ksz88x3_port_set_default_prio_quirks(struct ksz_device *dev, int port,
+						u8 prio)
+{
+	if (!prio)
+		return 0;
+
+	if (port == KSZ_PORT_2) {
+		dev_err(dev->dev, "Port priority configuration is not working on Port 2\n");
+		return -EINVAL;
+	} else if (port == KSZ_PORT_1) {
+		u8 port2_data;
+		int ret;
+
+		ret = ksz_pread8(dev, KSZ_PORT_2, KSZ8_REG_PORT_1_CTRL_0,
+				 &port2_data);
+		if (ret)
+			return ret;
+
+		if (!(port2_data & KSZ8_PORT_802_1P_ENABLE)) {
+			dev_err(dev->dev, "Not possible to configur port priority on Port 1 if PCP apptrust on Port 2 is disabled\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 /**
  * ksz_port_set_default_prio - Sets the default priority for a port on a KSZ
  *			       switch
@@ -196,12 +243,18 @@ int ksz_port_get_default_prio(struct dsa_switch *ds, int port)
 int ksz_port_set_default_prio(struct dsa_switch *ds, int port, u8 prio)
 {
 	struct ksz_device *dev = ds->priv;
-	int reg, shift;
+	int reg, shift, ret;
 	u8 mask;
 
 	if (prio >= dev->info->num_ipvs)
 		return -EINVAL;
 
+	if (ksz_is_ksz88x3(dev)) {
+		ret = ksz88x3_port_set_default_prio_quirks(dev, port, prio);
+		if (ret)
+			return ret;
+	}
+
 	ksz_get_default_port_prio_reg(dev, &reg, &mask, &shift);
 
 	return ksz_prmw8(dev, port, reg, mask, (prio << shift) & mask);
@@ -408,6 +461,155 @@ err_sel_not_vaild:
 	return -EINVAL;
 }
 
+/**
+ * ksz88x3_port1_apptrust_quirk - Quirk for apptrust configuration on Port 1
+ *				  of KSZ88x3 devices
+ * @dev: Pointer to the KSZ switch device structure
+ * @port: Port number for which to set the apptrust selectors
+ * @reg: Register address for the apptrust configuration
+ * @port1_data: Data to set for the apptrust configuration
+ *
+ * This function implements a quirk for apptrust configuration on Port 1 of
+ * KSZ88x3 devices. It ensures that apptrust configuration on Port 1 is not
+ * possible if PCP apptrust on Port 2 is disabled. This is because the Port 2
+ * seems to be permanently hardwired to PCP classification, so we need to
+ * do Port 1 configuration always in agreement with Port 2 configuration.
+ *
+ * Return: 0 on success, or a negative error code on failure
+ */
+static int ksz88x3_port1_apptrust_quirk(struct ksz_device *dev, int port,
+					int reg, u8 port1_data)
+{
+	u8 port2_data;
+	int ret;
+
+	/* If no apptrust is requested for Port 1, no need to care about Port 2
+	 * configuration.
+	 */
+	if (!(port1_data & (KSZ8_PORT_802_1P_ENABLE | KSZ8_PORT_DIFFSERV_ENABLE)))
+		return 0;
+
+	/* We got request to enable any apptrust on Port 1. To make it possible,
+	 * we need to enable multiple queues on the switch. If we enable
+	 * multiqueue support, PCP classification on Port 2 will be
+	 * automatically activated by HW.
+	 */
+	ret = ksz_pread8(dev, KSZ_PORT_2, reg, &port2_data);
+	if (ret)
+		return ret;
+
+	/* If KSZ8_PORT_802_1P_ENABLE bit is set on Port 2, the driver showed
+	 * the interest in PCP classification on Port 2. In this case,
+	 * multiqueue support is enabled and we can enable any apptrust on
+	 * Port 1.
+	 * If KSZ8_PORT_802_1P_ENABLE bit is not set on Port 2, the PCP
+	 * classification on Port 2 is still active, but the driver disabled
+	 * multiqueue support and made frame prioritization inactive for
+	 * all ports. In this case, we can't enable any apptrust on Port 1.
+	 */
+	if (!(port2_data & KSZ8_PORT_802_1P_ENABLE)) {
+		dev_err(dev->dev, "Not possible to enable any apptrust on Port 1 if PCP apptrust on Port 2 is disabled\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * ksz88x3_port2_apptrust_quirk - Quirk for apptrust configuration on Port 2
+ *				  of KSZ88x3 devices
+ * @dev: Pointer to the KSZ switch device structure
+ * @port: Port number for which to set the apptrust selectors
+ * @reg: Register address for the apptrust configuration
+ * @port2_data: Data to set for the apptrust configuration
+ *
+ * This function implements a quirk for apptrust configuration on Port 2 of
+ * KSZ88x3 devices. It ensures that DSCP apptrust is not working on Port 2 and
+ * that it is not possible to disable PCP on Port 2. The only way to disable PCP
+ * on Port 2 is to disable multiple queues on the switch.
+ *
+ * Return: 0 on success, or a negative error code on failure
+ */
+static int ksz88x3_port2_apptrust_quirk(struct ksz_device *dev, int port,
+					int reg, u8 port2_data)
+{
+	struct dsa_switch *ds = dev->ds;
+	u8 port1_data;
+	int ret;
+
+	/* First validate Port 2 configuration. DiffServ/DSCP is not working
+	 * on this port.
+	 */
+	if (port2_data & KSZ8_PORT_DIFFSERV_ENABLE) {
+		dev_err(dev->dev, "DSCP apptrust is not working on Port 2\n");
+		return -EINVAL;
+	}
+
+	/* If PCP support is requested, we need to enable all queues on the
+	 * switch to make PCP priority working on Port 2.
+	 */
+	if (port2_data & KSZ8_PORT_802_1P_ENABLE)
+		return ksz8_all_queues_split(dev, dev->info->num_tx_queues);
+
+	/* We got request to disable PCP priority on Port 2.
+	 * Now, we need to compare Port 2 configuration with Port 1
+	 * configuration.
+	 */
+	ret = ksz_pread8(dev, KSZ_PORT_1, reg, &port1_data);
+	if (ret)
+		return ret;
+
+	/* If Port 1 has any apptrust enabled, we can't disable multiple queues
+	 * on the switch, so we can't disable PCP on Port 2.
+	 */
+	if (port1_data & (KSZ8_PORT_802_1P_ENABLE | KSZ8_PORT_DIFFSERV_ENABLE)) {
+		dev_err(dev->dev, "Not possible to disable PCP on Port 2 if any apptrust is enabled on Port 1\n");
+		return -EINVAL;
+	}
+
+	/* Now we need to ensure that default priority on Port 1 is set to 0
+	 * otherwise we can't disable multiqueue support on the switch.
+	 */
+	ret = ksz_port_get_default_prio(ds, KSZ_PORT_1);
+	if (ret < 0) {
+		return ret;
+	} else if (ret) {
+		dev_err(dev->dev, "Not possible to disable PCP on Port 2 if non zero default priority is set on Port 1\n");
+		return -EINVAL;
+	}
+
+	/* Port 1 has no apptrust or default priority set and we got request to
+	 * disable PCP on Port 2. We can disable multiqueue support to disable
+	 * PCP on Port 2.
+	 */
+	return ksz8_all_queues_split(dev, 1);
+}
+
+/**
+ * ksz88x3_port_apptrust_quirk - Quirk for apptrust configuration on KSZ88x3
+ *			       devices
+ * @dev: Pointer to the KSZ switch device structure
+ * @port: Port number for which to set the apptrust selectors
+ * @reg: Register address for the apptrust configuration
+ * @data: Data to set for the apptrust configuration
+ *
+ * This function implements a quirk for apptrust configuration on KSZ88x3
+ * devices. It ensures that apptrust configuration on Port 1 and
+ * Port 2 is done in agreement with each other.
+ *
+ * Return: 0 on success, or a negative error code on failure
+ */
+static int ksz88x3_port_apptrust_quirk(struct ksz_device *dev, int port,
+				       int reg, u8 data)
+{
+	if (port == KSZ_PORT_1)
+		return ksz88x3_port1_apptrust_quirk(dev, port, reg, data);
+	else if (port == KSZ_PORT_2)
+		return ksz88x3_port2_apptrust_quirk(dev, port, reg, data);
+
+	return 0;
+}
+
 /**
  * ksz_port_set_apptrust - Sets the apptrust selectors for a port on a KSZ
  *			   switch
@@ -448,6 +650,12 @@ int ksz_port_set_apptrust(struct dsa_switch *ds, int port,
 		}
 	}
 
+	if (ksz_is_ksz88x3(dev)) {
+		ret = ksz88x3_port_apptrust_quirk(dev, port, reg, data);
+		if (ret)
+			return ret;
+	}
+
 	return ksz_prmw8(dev, port, reg, mask, data);
 }
 
@@ -502,7 +710,9 @@ int ksz_port_get_apptrust(struct dsa_switch *ds, int port, u8 *sel, int *nsel)
  */
 int ksz_dcb_init_port(struct ksz_device *dev, int port)
 {
+	const u8 *sel;
 	int ret, ipv;
+	int sel_len;
 
 	if (is_ksz8(dev)) {
 		ipv = ieee8021q_tt_to_tc(IEEE8021Q_TT_BE,
@@ -518,8 +728,18 @@ int ksz_dcb_init_port(struct ksz_device *dev, int port)
 	if (ret)
 		return ret;
 
-	return ksz_port_set_apptrust(dev->ds, port, ksz_supported_apptrust,
-				     ARRAY_SIZE(ksz_supported_apptrust));
+	if (ksz_is_ksz88x3(dev) && port == KSZ_PORT_2) {
+		/* KSZ88x3 devices do not support DSCP classification on
+		 * "Port 2.
+		 */
+		sel = ksz8_port2_supported_apptrust;
+		sel_len = ARRAY_SIZE(ksz8_port2_supported_apptrust);
+	} else {
+		sel = ksz_supported_apptrust;
+		sel_len = ARRAY_SIZE(ksz_supported_apptrust);
+	}
+
+	return ksz_port_set_apptrust(dev->ds, port, sel, sel_len);
 }
 
 /**