Merge branch 'ksz886x-cable-test'

Oleksij Rempel says:

====================
provide cable test support for the ksz886x switch

changes v5:
- drop resume() patch
- add Reviewed-by tags.
- rework dsa_slave_phy_connect() patch

changes v4:
- use fallthrough;
- use EOPNOTSUPP instead of ENOTSUPP
- drop flags variable in dsa_slave_phy_connect patch
- extend description for the "net: phy: micrel: apply resume errat"
  patch
- fix "use consistent alignments" patch

changes v3:
- remove RFC tag

changes v2:
- use generic MII_* defines where possible
- rework phylink validate
- remove phylink get state function
- reorder cabletest patches to make PHY flag patch in the right order
- fix MDI-X detection

This patches provide support for cable testing on the ksz886x switches.
Since it has one special port, we needed to add phylink with validation
and extra quirk for the PHY to signal, that one port will not provide
valid cable testing reports.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/microchip/ksz8795.c

@@ -6,6 +6,7 @@
  *	Tristram Ha <Tristram.Ha@microchip.com>
  */
 
+#include <linux/bitfield.h>
 #include <linux/delay.h>
 #include <linux/export.h>
 #include <linux/gpio.h>
@@ -15,8 +16,10 @@
 #include <linux/phy.h>
 #include <linux/etherdevice.h>
 #include <linux/if_bridge.h>
+#include <linux/micrel_phy.h>
 #include <net/dsa.h>
 #include <net/switchdev.h>
+#include <linux/phylink.h>
 
 #include "ksz_common.h"
 #include "ksz8795_reg.h"
@@ -727,92 +730,114 @@ static void ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val)
 	u8 restart, speed, ctrl, link;
 	const u8 *regs = ksz8->regs;
 	int processed = true;
+	u8 val1, val2;
 	u16 data = 0;
 	u8 p = phy;
 
 	switch (reg) {
-	case PHY_REG_CTRL:
+	case MII_BMCR:
 		ksz_pread8(dev, p, regs[P_NEG_RESTART_CTRL], &restart);
 		ksz_pread8(dev, p, regs[P_SPEED_STATUS], &speed);
 		ksz_pread8(dev, p, regs[P_FORCE_CTRL], &ctrl);
 		if (restart & PORT_PHY_LOOPBACK)
-			data |= PHY_LOOPBACK;
+			data |= BMCR_LOOPBACK;
 		if (ctrl & PORT_FORCE_100_MBIT)
-			data |= PHY_SPEED_100MBIT;
+			data |= BMCR_SPEED100;
 		if (ksz_is_ksz88x3(dev)) {
 			if ((ctrl & PORT_AUTO_NEG_ENABLE))
-				data |= PHY_AUTO_NEG_ENABLE;
+				data |= BMCR_ANENABLE;
 		} else {
 			if (!(ctrl & PORT_AUTO_NEG_DISABLE))
-				data |= PHY_AUTO_NEG_ENABLE;
+				data |= BMCR_ANENABLE;
 		}
 		if (restart & PORT_POWER_DOWN)
-			data |= PHY_POWER_DOWN;
+			data |= BMCR_PDOWN;
 		if (restart & PORT_AUTO_NEG_RESTART)
-			data |= PHY_AUTO_NEG_RESTART;
+			data |= BMCR_ANRESTART;
 		if (ctrl & PORT_FORCE_FULL_DUPLEX)
-			data |= PHY_FULL_DUPLEX;
+			data |= BMCR_FULLDPLX;
 		if (speed & PORT_HP_MDIX)
-			data |= PHY_HP_MDIX;
+			data |= KSZ886X_BMCR_HP_MDIX;
 		if (restart & PORT_FORCE_MDIX)
-			data |= PHY_FORCE_MDIX;
+			data |= KSZ886X_BMCR_FORCE_MDI;
 		if (restart & PORT_AUTO_MDIX_DISABLE)
-			data |= PHY_AUTO_MDIX_DISABLE;
+			data |= KSZ886X_BMCR_DISABLE_AUTO_MDIX;
 		if (restart & PORT_TX_DISABLE)
-			data |= PHY_TRANSMIT_DISABLE;
+			data |= KSZ886X_BMCR_DISABLE_TRANSMIT;
 		if (restart & PORT_LED_OFF)
-			data |= PHY_LED_DISABLE;
+			data |= KSZ886X_BMCR_DISABLE_LED;
 		break;
-	case PHY_REG_STATUS:
+	case MII_BMSR:
 		ksz_pread8(dev, p, regs[P_LINK_STATUS], &link);
-		data = PHY_100BTX_FD_CAPABLE |
-		       PHY_100BTX_CAPABLE |
-		       PHY_10BT_FD_CAPABLE |
-		       PHY_10BT_CAPABLE |
-		       PHY_AUTO_NEG_CAPABLE;
+		data = BMSR_100FULL |
+		       BMSR_100HALF |
+		       BMSR_10FULL |
+		       BMSR_10HALF |
+		       BMSR_ANEGCAPABLE;
 		if (link & PORT_AUTO_NEG_COMPLETE)
-			data |= PHY_AUTO_NEG_ACKNOWLEDGE;
+			data |= BMSR_ANEGCOMPLETE;
 		if (link & PORT_STAT_LINK_GOOD)
-			data |= PHY_LINK_STATUS;
+			data |= BMSR_LSTATUS;
 		break;
-	case PHY_REG_ID_1:
+	case MII_PHYSID1:
 		data = KSZ8795_ID_HI;
 		break;
-	case PHY_REG_ID_2:
+	case MII_PHYSID2:
 		if (ksz_is_ksz88x3(dev))
 			data = KSZ8863_ID_LO;
 		else
 			data = KSZ8795_ID_LO;
 		break;
-	case PHY_REG_AUTO_NEGOTIATION:
+	case MII_ADVERTISE:
 		ksz_pread8(dev, p, regs[P_LOCAL_CTRL], &ctrl);
-		data = PHY_AUTO_NEG_802_3;
+		data = ADVERTISE_CSMA;
 		if (ctrl & PORT_AUTO_NEG_SYM_PAUSE)
-			data |= PHY_AUTO_NEG_SYM_PAUSE;
+			data |= ADVERTISE_PAUSE_CAP;
 		if (ctrl & PORT_AUTO_NEG_100BTX_FD)
-			data |= PHY_AUTO_NEG_100BTX_FD;
+			data |= ADVERTISE_100FULL;
 		if (ctrl & PORT_AUTO_NEG_100BTX)
-			data |= PHY_AUTO_NEG_100BTX;
+			data |= ADVERTISE_100HALF;
 		if (ctrl & PORT_AUTO_NEG_10BT_FD)
-			data |= PHY_AUTO_NEG_10BT_FD;
+			data |= ADVERTISE_10FULL;
 		if (ctrl & PORT_AUTO_NEG_10BT)
-			data |= PHY_AUTO_NEG_10BT;
+			data |= ADVERTISE_10HALF;
 		break;
-	case PHY_REG_REMOTE_CAPABILITY:
+	case MII_LPA:
 		ksz_pread8(dev, p, regs[P_REMOTE_STATUS], &link);
-		data = PHY_AUTO_NEG_802_3;
+		data = LPA_SLCT;
 		if (link & PORT_REMOTE_SYM_PAUSE)
-			data |= PHY_AUTO_NEG_SYM_PAUSE;
+			data |= LPA_PAUSE_CAP;
 		if (link & PORT_REMOTE_100BTX_FD)
-			data |= PHY_AUTO_NEG_100BTX_FD;
+			data |= LPA_100FULL;
 		if (link & PORT_REMOTE_100BTX)
-			data |= PHY_AUTO_NEG_100BTX;
+			data |= LPA_100HALF;
 		if (link & PORT_REMOTE_10BT_FD)
-			data |= PHY_AUTO_NEG_10BT_FD;
+			data |= LPA_10FULL;
 		if (link & PORT_REMOTE_10BT)
-			data |= PHY_AUTO_NEG_10BT;
-		if (data & ~PHY_AUTO_NEG_802_3)
-			data |= PHY_REMOTE_ACKNOWLEDGE_NOT;
+			data |= LPA_10HALF;
+		if (data & ~LPA_SLCT)
+			data |= LPA_LPACK;
+		break;
+	case PHY_REG_LINK_MD:
+		ksz_pread8(dev, p, REG_PORT_LINK_MD_CTRL, &val1);
+		ksz_pread8(dev, p, REG_PORT_LINK_MD_RESULT, &val2);
+		if (val1 & PORT_START_CABLE_DIAG)
+			data |= PHY_START_CABLE_DIAG;
+
+		if (val1 & PORT_CABLE_10M_SHORT)
+			data |= PHY_CABLE_10M_SHORT;
+
+		data |= FIELD_PREP(PHY_CABLE_DIAG_RESULT_M,
+				FIELD_GET(PORT_CABLE_DIAG_RESULT_M, val1));
+
+		data |= FIELD_PREP(PHY_CABLE_FAULT_COUNTER_M,
+				(FIELD_GET(PORT_CABLE_FAULT_COUNTER_H, val1) << 8) |
+				FIELD_GET(PORT_CABLE_FAULT_COUNTER_L, val2));
+		break;
+	case PHY_REG_PHY_CTRL:
+		ksz_pread8(dev, p, regs[P_LINK_STATUS], &link);
+		if (link & PORT_MDIX_STATUS)
+			data |= KSZ886X_CTRL_MDIX_STAT;
 		break;
 	default:
 		processed = false;
@@ -830,14 +855,14 @@ static void ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
 	u8 p = phy;
 
 	switch (reg) {
-	case PHY_REG_CTRL:
+	case MII_BMCR:
 
 		/* Do not support PHY reset function. */
-		if (val & PHY_RESET)
+		if (val & BMCR_RESET)
 			break;
 		ksz_pread8(dev, p, regs[P_SPEED_STATUS], &speed);
 		data = speed;
-		if (val & PHY_HP_MDIX)
+		if (val & KSZ886X_BMCR_HP_MDIX)
 			data |= PORT_HP_MDIX;
 		else
 			data &= ~PORT_HP_MDIX;
@@ -846,12 +871,12 @@ static void ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
 		ksz_pread8(dev, p, regs[P_FORCE_CTRL], &ctrl);
 		data = ctrl;
 		if (ksz_is_ksz88x3(dev)) {
-			if ((val & PHY_AUTO_NEG_ENABLE))
+			if ((val & BMCR_ANENABLE))
 				data |= PORT_AUTO_NEG_ENABLE;
 			else
 				data &= ~PORT_AUTO_NEG_ENABLE;
 		} else {
-			if (!(val & PHY_AUTO_NEG_ENABLE))
+			if (!(val & BMCR_ANENABLE))
 				data |= PORT_AUTO_NEG_DISABLE;
 			else
 				data &= ~PORT_AUTO_NEG_DISABLE;
@@ -861,11 +886,11 @@ static void ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
 				data |= PORT_AUTO_NEG_DISABLE;
 		}
 
-		if (val & PHY_SPEED_100MBIT)
+		if (val & BMCR_SPEED100)
 			data |= PORT_FORCE_100_MBIT;
 		else
 			data &= ~PORT_FORCE_100_MBIT;
-		if (val & PHY_FULL_DUPLEX)
+		if (val & BMCR_FULLDPLX)
 			data |= PORT_FORCE_FULL_DUPLEX;
 		else
 			data &= ~PORT_FORCE_FULL_DUPLEX;
@@ -873,38 +898,38 @@ static void ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
 			ksz_pwrite8(dev, p, regs[P_FORCE_CTRL], data);
 		ksz_pread8(dev, p, regs[P_NEG_RESTART_CTRL], &restart);
 		data = restart;
-		if (val & PHY_LED_DISABLE)
+		if (val & KSZ886X_BMCR_DISABLE_LED)
 			data |= PORT_LED_OFF;
 		else
 			data &= ~PORT_LED_OFF;
-		if (val & PHY_TRANSMIT_DISABLE)
+		if (val & KSZ886X_BMCR_DISABLE_TRANSMIT)
 			data |= PORT_TX_DISABLE;
 		else
 			data &= ~PORT_TX_DISABLE;
-		if (val & PHY_AUTO_NEG_RESTART)
+		if (val & BMCR_ANRESTART)
 			data |= PORT_AUTO_NEG_RESTART;
 		else
 			data &= ~(PORT_AUTO_NEG_RESTART);
-		if (val & PHY_POWER_DOWN)
+		if (val & BMCR_PDOWN)
 			data |= PORT_POWER_DOWN;
 		else
 			data &= ~PORT_POWER_DOWN;
-		if (val & PHY_AUTO_MDIX_DISABLE)
+		if (val & KSZ886X_BMCR_DISABLE_AUTO_MDIX)
 			data |= PORT_AUTO_MDIX_DISABLE;
 		else
 			data &= ~PORT_AUTO_MDIX_DISABLE;
-		if (val & PHY_FORCE_MDIX)
+		if (val & KSZ886X_BMCR_FORCE_MDI)
 			data |= PORT_FORCE_MDIX;
 		else
 			data &= ~PORT_FORCE_MDIX;
-		if (val & PHY_LOOPBACK)
+		if (val & BMCR_LOOPBACK)
 			data |= PORT_PHY_LOOPBACK;
 		else
 			data &= ~PORT_PHY_LOOPBACK;
 		if (data != restart)
 			ksz_pwrite8(dev, p, regs[P_NEG_RESTART_CTRL], data);
 		break;
-	case PHY_REG_AUTO_NEGOTIATION:
+	case MII_ADVERTISE:
 		ksz_pread8(dev, p, regs[P_LOCAL_CTRL], &ctrl);
 		data = ctrl;
 		data &= ~(PORT_AUTO_NEG_SYM_PAUSE |
@@ -912,19 +937,23 @@ static void ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
 			  PORT_AUTO_NEG_100BTX |
 			  PORT_AUTO_NEG_10BT_FD |
 			  PORT_AUTO_NEG_10BT);
-		if (val & PHY_AUTO_NEG_SYM_PAUSE)
+		if (val & ADVERTISE_PAUSE_CAP)
 			data |= PORT_AUTO_NEG_SYM_PAUSE;
-		if (val & PHY_AUTO_NEG_100BTX_FD)
+		if (val & ADVERTISE_100FULL)
 			data |= PORT_AUTO_NEG_100BTX_FD;
-		if (val & PHY_AUTO_NEG_100BTX)
+		if (val & ADVERTISE_100HALF)
 			data |= PORT_AUTO_NEG_100BTX;
-		if (val & PHY_AUTO_NEG_10BT_FD)
+		if (val & ADVERTISE_10FULL)
 			data |= PORT_AUTO_NEG_10BT_FD;
-		if (val & PHY_AUTO_NEG_10BT)
+		if (val & ADVERTISE_10HALF)
 			data |= PORT_AUTO_NEG_10BT;
 		if (data != ctrl)
 			ksz_pwrite8(dev, p, regs[P_LOCAL_CTRL], data);
 		break;
+	case PHY_REG_LINK_MD:
+		if (val & PHY_START_CABLE_DIAG)
+			ksz_port_cfg(dev, p, REG_PORT_LINK_MD_CTRL, PORT_START_CABLE_DIAG, true);
+		break;
 	default:
 		break;
 	}
@@ -941,6 +970,18 @@ static enum dsa_tag_protocol ksz8_get_tag_protocol(struct dsa_switch *ds,
 		DSA_TAG_PROTO_KSZ9893 : DSA_TAG_PROTO_KSZ8795;
 }
 
+static u32 ksz8_sw_get_phy_flags(struct dsa_switch *ds, int port)
+{
+	/* Silicon Errata Sheet (DS80000830A):
+	 * Port 1 does not work with LinkMD Cable-Testing.
+	 * Port 1 does not respond to received PAUSE control frames.
+	 */
+	if (!port)
+		return MICREL_KSZ8_P1_ERRATA;
+
+	return 0;
+}
+
 static void ksz8_get_strings(struct dsa_switch *ds, int port,
 			     u32 stringset, uint8_t *buf)
 {
@@ -1419,11 +1460,66 @@ static int ksz8_setup(struct dsa_switch *ds)
 	return 0;
 }
 
+static void ksz8_validate(struct dsa_switch *ds, int port,
+			  unsigned long *supported,
+			  struct phylink_link_state *state)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
+	struct ksz_device *dev = ds->priv;
+
+	if (port == dev->cpu_port) {
+		if (state->interface != PHY_INTERFACE_MODE_RMII &&
+		    state->interface != PHY_INTERFACE_MODE_MII &&
+		    state->interface != PHY_INTERFACE_MODE_NA)
+			goto unsupported;
+	} else {
+		if (state->interface != PHY_INTERFACE_MODE_INTERNAL &&
+		    state->interface != PHY_INTERFACE_MODE_NA)
+			goto unsupported;
+	}
+
+	/* Allow all the expected bits */
+	phylink_set_port_modes(mask);
+	phylink_set(mask, Autoneg);
+
+	/* Silicon Errata Sheet (DS80000830A):
+	 * "Port 1 does not respond to received flow control PAUSE frames"
+	 * So, disable Pause support on "Port 1" (port == 0) for all ksz88x3
+	 * switches.
+	 */
+	if (!ksz_is_ksz88x3(dev) || port)
+		phylink_set(mask, Pause);
+
+	/* Asym pause is not supported on KSZ8863 and KSZ8873 */
+	if (!ksz_is_ksz88x3(dev))
+		phylink_set(mask, Asym_Pause);
+
+	/* 10M and 100M are only supported */
+	phylink_set(mask, 10baseT_Half);
+	phylink_set(mask, 10baseT_Full);
+	phylink_set(mask, 100baseT_Half);
+	phylink_set(mask, 100baseT_Full);
+
+	bitmap_and(supported, supported, mask,
+		   __ETHTOOL_LINK_MODE_MASK_NBITS);
+	bitmap_and(state->advertising, state->advertising, mask,
+		   __ETHTOOL_LINK_MODE_MASK_NBITS);
+
+	return;
+
+unsupported:
+	bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
+	dev_err(ds->dev, "Unsupported interface: %s, port: %d\n",
+		phy_modes(state->interface), port);
+}
+
 static const struct dsa_switch_ops ksz8_switch_ops = {
 	.get_tag_protocol	= ksz8_get_tag_protocol,
+	.get_phy_flags		= ksz8_sw_get_phy_flags,
 	.setup			= ksz8_setup,
 	.phy_read		= ksz_phy_read16,
 	.phy_write		= ksz_phy_write16,
+	.phylink_validate	= ksz8_validate,
 	.phylink_mac_link_down	= ksz_mac_link_down,
 	.port_enable		= ksz_enable_port,
 	.get_strings		= ksz8_get_strings,

drivers/net/dsa/microchip/ksz8795_reg.h

@@ -249,7 +249,7 @@
 #define REG_PORT_4_LINK_MD_CTRL		0x4A
 
 #define PORT_CABLE_10M_SHORT		BIT(7)
-#define PORT_CABLE_DIAG_RESULT_M	0x3
+#define PORT_CABLE_DIAG_RESULT_M	GENMASK(6, 5)
 #define PORT_CABLE_DIAG_RESULT_S	5
 #define PORT_CABLE_STAT_NORMAL		0
 #define PORT_CABLE_STAT_OPEN		1
@@ -744,68 +744,6 @@
 
 #define PORT_ACL_FORCE_DLR_MISS		BIT(0)
 
-#ifndef PHY_REG_CTRL
-#define PHY_REG_CTRL			0
-
-#define PHY_RESET			BIT(15)
-#define PHY_LOOPBACK			BIT(14)
-#define PHY_SPEED_100MBIT		BIT(13)
-#define PHY_AUTO_NEG_ENABLE		BIT(12)
-#define PHY_POWER_DOWN			BIT(11)
-#define PHY_MII_DISABLE			BIT(10)
-#define PHY_AUTO_NEG_RESTART		BIT(9)
-#define PHY_FULL_DUPLEX			BIT(8)
-#define PHY_COLLISION_TEST_NOT		BIT(7)
-#define PHY_HP_MDIX			BIT(5)
-#define PHY_FORCE_MDIX			BIT(4)
-#define PHY_AUTO_MDIX_DISABLE		BIT(3)
-#define PHY_REMOTE_FAULT_DISABLE	BIT(2)
-#define PHY_TRANSMIT_DISABLE		BIT(1)
-#define PHY_LED_DISABLE			BIT(0)
-
-#define PHY_REG_STATUS			1
-
-#define PHY_100BT4_CAPABLE		BIT(15)
-#define PHY_100BTX_FD_CAPABLE		BIT(14)
-#define PHY_100BTX_CAPABLE		BIT(13)
-#define PHY_10BT_FD_CAPABLE		BIT(12)
-#define PHY_10BT_CAPABLE		BIT(11)
-#define PHY_MII_SUPPRESS_CAPABLE_NOT	BIT(6)
-#define PHY_AUTO_NEG_ACKNOWLEDGE	BIT(5)
-#define PHY_REMOTE_FAULT		BIT(4)
-#define PHY_AUTO_NEG_CAPABLE		BIT(3)
-#define PHY_LINK_STATUS			BIT(2)
-#define PHY_JABBER_DETECT_NOT		BIT(1)
-#define PHY_EXTENDED_CAPABILITY		BIT(0)
-
-#define PHY_REG_ID_1			2
-#define PHY_REG_ID_2			3
-
-#define PHY_REG_AUTO_NEGOTIATION	4
-
-#define PHY_AUTO_NEG_NEXT_PAGE_NOT	BIT(15)
-#define PHY_AUTO_NEG_REMOTE_FAULT_NOT	BIT(13)
-#define PHY_AUTO_NEG_SYM_PAUSE		BIT(10)
-#define PHY_AUTO_NEG_100BT4		BIT(9)
-#define PHY_AUTO_NEG_100BTX_FD		BIT(8)
-#define PHY_AUTO_NEG_100BTX		BIT(7)
-#define PHY_AUTO_NEG_10BT_FD		BIT(6)
-#define PHY_AUTO_NEG_10BT		BIT(5)
-#define PHY_AUTO_NEG_SELECTOR		0x001F
-#define PHY_AUTO_NEG_802_3		0x0001
-
-#define PHY_REG_REMOTE_CAPABILITY	5
-
-#define PHY_REMOTE_NEXT_PAGE_NOT	BIT(15)
-#define PHY_REMOTE_ACKNOWLEDGE_NOT	BIT(14)
-#define PHY_REMOTE_REMOTE_FAULT_NOT	BIT(13)
-#define PHY_REMOTE_SYM_PAUSE		BIT(10)
-#define PHY_REMOTE_100BTX_FD		BIT(8)
-#define PHY_REMOTE_100BTX		BIT(7)
-#define PHY_REMOTE_10BT_FD		BIT(6)
-#define PHY_REMOTE_10BT			BIT(5)
-#endif
-
 #define KSZ8795_ID_HI			0x0022
 #define KSZ8795_ID_LO			0x1550
 #define KSZ8863_ID_LO			0x1430
@@ -815,13 +753,14 @@
 #define PHY_REG_LINK_MD			0x1D
 
 #define PHY_START_CABLE_DIAG		BIT(15)
+#define PHY_CABLE_DIAG_RESULT_M		GENMASK(14, 13)
 #define PHY_CABLE_DIAG_RESULT		0x6000
 #define PHY_CABLE_STAT_NORMAL		0x0000
 #define PHY_CABLE_STAT_OPEN		0x2000
 #define PHY_CABLE_STAT_SHORT		0x4000
 #define PHY_CABLE_STAT_FAILED		0x6000
 #define PHY_CABLE_10M_SHORT		BIT(12)
-#define PHY_CABLE_FAULT_COUNTER		0x01FF
+#define PHY_CABLE_FAULT_COUNTER_M	GENMASK(8, 0)
 
 #define PHY_REG_PHY_CTRL		0x1F
 

drivers/net/ethernet/micrel/ksz884x.c

@@ -25,6 +25,7 @@
 #include <linux/crc32.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
+#include <linux/micrel_phy.h>
 
 
 /* DMA Registers */
@@ -271,84 +272,15 @@
 
 #define KS884X_PHY_CTRL_OFFSET		0x00
 
-/* Mode Control Register */
-#define PHY_REG_CTRL			0
-
-#define PHY_RESET			0x8000
-#define PHY_LOOPBACK			0x4000
-#define PHY_SPEED_100MBIT		0x2000
-#define PHY_AUTO_NEG_ENABLE		0x1000
-#define PHY_POWER_DOWN			0x0800
-#define PHY_MII_DISABLE			0x0400
-#define PHY_AUTO_NEG_RESTART		0x0200
-#define PHY_FULL_DUPLEX			0x0100
-#define PHY_COLLISION_TEST		0x0080
-#define PHY_HP_MDIX			0x0020
-#define PHY_FORCE_MDIX			0x0010
-#define PHY_AUTO_MDIX_DISABLE		0x0008
-#define PHY_REMOTE_FAULT_DISABLE	0x0004
-#define PHY_TRANSMIT_DISABLE		0x0002
-#define PHY_LED_DISABLE			0x0001
-
 #define KS884X_PHY_STATUS_OFFSET	0x02
 
-/* Mode Status Register */
-#define PHY_REG_STATUS			1
-
-#define PHY_100BT4_CAPABLE		0x8000
-#define PHY_100BTX_FD_CAPABLE		0x4000
-#define PHY_100BTX_CAPABLE		0x2000
-#define PHY_10BT_FD_CAPABLE		0x1000
-#define PHY_10BT_CAPABLE		0x0800
-#define PHY_MII_SUPPRESS_CAPABLE	0x0040
-#define PHY_AUTO_NEG_ACKNOWLEDGE	0x0020
-#define PHY_REMOTE_FAULT		0x0010
-#define PHY_AUTO_NEG_CAPABLE		0x0008
-#define PHY_LINK_STATUS			0x0004
-#define PHY_JABBER_DETECT		0x0002
-#define PHY_EXTENDED_CAPABILITY		0x0001
-
 #define KS884X_PHY_ID_1_OFFSET		0x04
 #define KS884X_PHY_ID_2_OFFSET		0x06
 
-/* PHY Identifier Registers */
-#define PHY_REG_ID_1			2
-#define PHY_REG_ID_2			3
-
 #define KS884X_PHY_AUTO_NEG_OFFSET	0x08
 
-/* Auto-Negotiation Advertisement Register */
-#define PHY_REG_AUTO_NEGOTIATION	4
-
-#define PHY_AUTO_NEG_NEXT_PAGE		0x8000
-#define PHY_AUTO_NEG_REMOTE_FAULT	0x2000
-/* Not supported. */
-#define PHY_AUTO_NEG_ASYM_PAUSE		0x0800
-#define PHY_AUTO_NEG_SYM_PAUSE		0x0400
-#define PHY_AUTO_NEG_100BT4		0x0200
-#define PHY_AUTO_NEG_100BTX_FD		0x0100
-#define PHY_AUTO_NEG_100BTX		0x0080
-#define PHY_AUTO_NEG_10BT_FD		0x0040
-#define PHY_AUTO_NEG_10BT		0x0020
-#define PHY_AUTO_NEG_SELECTOR		0x001F
-#define PHY_AUTO_NEG_802_3		0x0001
-
-#define PHY_AUTO_NEG_PAUSE  (PHY_AUTO_NEG_SYM_PAUSE | PHY_AUTO_NEG_ASYM_PAUSE)
-
 #define KS884X_PHY_REMOTE_CAP_OFFSET	0x0A
 
-/* Auto-Negotiation Link Partner Ability Register */
-#define PHY_REG_REMOTE_CAPABILITY	5
-
-#define PHY_REMOTE_NEXT_PAGE		0x8000
-#define PHY_REMOTE_ACKNOWLEDGE		0x4000
-#define PHY_REMOTE_REMOTE_FAULT		0x2000
-#define PHY_REMOTE_SYM_PAUSE		0x0400
-#define PHY_REMOTE_100BTX_FD		0x0100
-#define PHY_REMOTE_100BTX		0x0080
-#define PHY_REMOTE_10BT_FD		0x0040
-#define PHY_REMOTE_10BT			0x0020
-
 /* P1VCT */
 #define KS884X_P1VCT_P			0x04F0
 #define KS884X_P1PHYCTRL_P		0x04F2
@@ -2886,15 +2818,6 @@ static void sw_block_addr(struct ksz_hw *hw)
 	}
 }
 
-#define PHY_LINK_SUPPORT		\
-	(PHY_AUTO_NEG_ASYM_PAUSE |	\
-	PHY_AUTO_NEG_SYM_PAUSE |	\
-	PHY_AUTO_NEG_100BT4 |		\
-	PHY_AUTO_NEG_100BTX_FD |	\
-	PHY_AUTO_NEG_100BTX |		\
-	PHY_AUTO_NEG_10BT_FD |		\
-	PHY_AUTO_NEG_10BT)
-
 static inline void hw_r_phy_ctrl(struct ksz_hw *hw, int phy, u16 *data)
 {
 	*data = readw(hw->io + phy + KS884X_PHY_CTRL_OFFSET);
@@ -3238,16 +3161,18 @@ static void determine_flow_ctrl(struct ksz_hw *hw, struct ksz_port *port,
 	rx = tx = 0;
 	if (port->force_link)
 		rx = tx = 1;
-	if (remote & PHY_AUTO_NEG_SYM_PAUSE) {
-		if (local & PHY_AUTO_NEG_SYM_PAUSE) {
+	if (remote & LPA_PAUSE_CAP) {
+		if (local & ADVERTISE_PAUSE_CAP) {
 			rx = tx = 1;
-		} else if ((remote & PHY_AUTO_NEG_ASYM_PAUSE) &&
-				(local & PHY_AUTO_NEG_PAUSE) ==
-				PHY_AUTO_NEG_ASYM_PAUSE) {
+		} else if ((remote & LPA_PAUSE_ASYM) &&
+			   (local &
+			    (ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM)) ==
+			   ADVERTISE_PAUSE_ASYM) {
 			tx = 1;
 		}
-	} else if (remote & PHY_AUTO_NEG_ASYM_PAUSE) {
-		if ((local & PHY_AUTO_NEG_PAUSE) == PHY_AUTO_NEG_PAUSE)
+	} else if (remote & LPA_PAUSE_ASYM) {
+		if ((local & (ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM))
+		    == (ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM))
 			rx = 1;
 	}
 	if (!hw->ksz_switch)
@@ -3428,16 +3353,16 @@ static void port_force_link_speed(struct ksz_port *port)
 		phy = KS884X_PHY_1_CTRL_OFFSET + p * PHY_CTRL_INTERVAL;
 		hw_r_phy_ctrl(hw, phy, &data);
 
-		data &= ~PHY_AUTO_NEG_ENABLE;
+		data &= ~BMCR_ANENABLE;
 
 		if (10 == port->speed)
-			data &= ~PHY_SPEED_100MBIT;
+			data &= ~BMCR_SPEED100;
 		else if (100 == port->speed)
-			data |= PHY_SPEED_100MBIT;
+			data |= BMCR_SPEED100;
 		if (1 == port->duplex)
-			data &= ~PHY_FULL_DUPLEX;
+			data &= ~BMCR_FULLDPLX;
 		else if (2 == port->duplex)
-			data |= PHY_FULL_DUPLEX;
+			data |= BMCR_FULLDPLX;
 		hw_w_phy_ctrl(hw, phy, data);
 	}
 }

drivers/net/phy/micrel.c

@@ -20,6 +20,7 @@
  */
 
 #include <linux/bitfield.h>
+#include <linux/ethtool_netlink.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/phy.h>
@@ -53,13 +54,31 @@
 #define KSZPHY_INTCS_STATUS			(KSZPHY_INTCS_LINK_DOWN_STATUS |\
 						 KSZPHY_INTCS_LINK_UP_STATUS)
 
+/* LinkMD Control/Status */
+#define KSZ8081_LMD				0x1d
+#define KSZ8081_LMD_ENABLE_TEST			BIT(15)
+#define KSZ8081_LMD_STAT_NORMAL			0
+#define KSZ8081_LMD_STAT_OPEN			1
+#define KSZ8081_LMD_STAT_SHORT			2
+#define KSZ8081_LMD_STAT_FAIL			3
+#define KSZ8081_LMD_STAT_MASK			GENMASK(14, 13)
+/* Short cable (<10 meter) has been detected by LinkMD */
+#define KSZ8081_LMD_SHORT_INDICATOR		BIT(12)
+#define KSZ8081_LMD_DELTA_TIME_MASK		GENMASK(8, 0)
+
 /* PHY Control 1 */
 #define MII_KSZPHY_CTRL_1			0x1e
+#define KSZ8081_CTRL1_MDIX_STAT			BIT(4)
 
 /* PHY Control 2 / PHY Control (if no PHY Control 1) */
 #define MII_KSZPHY_CTRL_2			0x1f
 #define MII_KSZPHY_CTRL				MII_KSZPHY_CTRL_2
 /* bitmap of PHY register to set interrupt mode */
+#define KSZ8081_CTRL2_HP_MDIX			BIT(15)
+#define KSZ8081_CTRL2_MDI_MDI_X_SELECT		BIT(14)
+#define KSZ8081_CTRL2_DISABLE_AUTO_MDIX		BIT(13)
+#define KSZ8081_CTRL2_FORCE_LINK		BIT(11)
+#define KSZ8081_CTRL2_POWER_SAVING		BIT(10)
 #define KSZPHY_CTRL_INT_ACTIVE_HIGH		BIT(9)
 #define KSZPHY_RMII_REF_CLK_SEL			BIT(7)
 
@@ -422,6 +441,87 @@ static int ksz8081_config_init(struct phy_device *phydev)
 	return kszphy_config_init(phydev);
 }
 
+static int ksz8081_config_mdix(struct phy_device *phydev, u8 ctrl)
+{
+	u16 val;
+
+	switch (ctrl) {
+	case ETH_TP_MDI:
+		val = KSZ8081_CTRL2_DISABLE_AUTO_MDIX;
+		break;
+	case ETH_TP_MDI_X:
+		val = KSZ8081_CTRL2_DISABLE_AUTO_MDIX |
+			KSZ8081_CTRL2_MDI_MDI_X_SELECT;
+		break;
+	case ETH_TP_MDI_AUTO:
+		val = 0;
+		break;
+	default:
+		return 0;
+	}
+
+	return phy_modify(phydev, MII_KSZPHY_CTRL_2,
+			  KSZ8081_CTRL2_HP_MDIX |
+			  KSZ8081_CTRL2_MDI_MDI_X_SELECT |
+			  KSZ8081_CTRL2_DISABLE_AUTO_MDIX,
+			  KSZ8081_CTRL2_HP_MDIX | val);
+}
+
+static int ksz8081_config_aneg(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_config_aneg(phydev);
+	if (ret)
+		return ret;
+
+	/* The MDI-X configuration is automatically changed by the PHY after
+	 * switching from autoneg off to on. So, take MDI-X configuration under
+	 * own control and set it after autoneg configuration was done.
+	 */
+	return ksz8081_config_mdix(phydev, phydev->mdix_ctrl);
+}
+
+static int ksz8081_mdix_update(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = phy_read(phydev, MII_KSZPHY_CTRL_2);
+	if (ret < 0)
+		return ret;
+
+	if (ret & KSZ8081_CTRL2_DISABLE_AUTO_MDIX) {
+		if (ret & KSZ8081_CTRL2_MDI_MDI_X_SELECT)
+			phydev->mdix_ctrl = ETH_TP_MDI_X;
+		else
+			phydev->mdix_ctrl = ETH_TP_MDI;
+	} else {
+		phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+	}
+
+	ret = phy_read(phydev, MII_KSZPHY_CTRL_1);
+	if (ret < 0)
+		return ret;
+
+	if (ret & KSZ8081_CTRL1_MDIX_STAT)
+		phydev->mdix = ETH_TP_MDI;
+	else
+		phydev->mdix = ETH_TP_MDI_X;
+
+	return 0;
+}
+
+static int ksz8081_read_status(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = ksz8081_mdix_update(phydev);
+	if (ret < 0)
+		return ret;
+
+	return genphy_read_status(phydev);
+}
+
 static int ksz8061_config_init(struct phy_device *phydev)
 {
 	int ret;
@@ -1045,6 +1145,92 @@ static int ksz8873mll_config_aneg(struct phy_device *phydev)
 	return 0;
 }
 
+static int ksz886x_config_mdix(struct phy_device *phydev, u8 ctrl)
+{
+	u16 val;
+
+	switch (ctrl) {
+	case ETH_TP_MDI:
+		val = KSZ886X_BMCR_DISABLE_AUTO_MDIX;
+		break;
+	case ETH_TP_MDI_X:
+		/* Note: The naming of the bit KSZ886X_BMCR_FORCE_MDI is bit
+		 * counter intuitive, the "-X" in "1 = Force MDI" in the data
+		 * sheet seems to be missing:
+		 * 1 = Force MDI (sic!) (transmit on RX+/RX- pins)
+		 * 0 = Normal operation (transmit on TX+/TX- pins)
+		 */
+		val = KSZ886X_BMCR_DISABLE_AUTO_MDIX | KSZ886X_BMCR_FORCE_MDI;
+		break;
+	case ETH_TP_MDI_AUTO:
+		val = 0;
+		break;
+	default:
+		return 0;
+	}
+
+	return phy_modify(phydev, MII_BMCR,
+			  KSZ886X_BMCR_HP_MDIX | KSZ886X_BMCR_FORCE_MDI |
+			  KSZ886X_BMCR_DISABLE_AUTO_MDIX,
+			  KSZ886X_BMCR_HP_MDIX | val);
+}
+
+static int ksz886x_config_aneg(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_config_aneg(phydev);
+	if (ret)
+		return ret;
+
+	/* The MDI-X configuration is automatically changed by the PHY after
+	 * switching from autoneg off to on. So, take MDI-X configuration under
+	 * own control and set it after autoneg configuration was done.
+	 */
+	return ksz886x_config_mdix(phydev, phydev->mdix_ctrl);
+}
+
+static int ksz886x_mdix_update(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = phy_read(phydev, MII_BMCR);
+	if (ret < 0)
+		return ret;
+
+	if (ret & KSZ886X_BMCR_DISABLE_AUTO_MDIX) {
+		if (ret & KSZ886X_BMCR_FORCE_MDI)
+			phydev->mdix_ctrl = ETH_TP_MDI_X;
+		else
+			phydev->mdix_ctrl = ETH_TP_MDI;
+	} else {
+		phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+	}
+
+	ret = phy_read(phydev, MII_KSZPHY_CTRL);
+	if (ret < 0)
+		return ret;
+
+	/* Same reverse logic as KSZ886X_BMCR_FORCE_MDI */
+	if (ret & KSZ886X_CTRL_MDIX_STAT)
+		phydev->mdix = ETH_TP_MDI_X;
+	else
+		phydev->mdix = ETH_TP_MDI;
+
+	return 0;
+}
+
+static int ksz886x_read_status(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = ksz886x_mdix_update(phydev);
+	if (ret < 0)
+		return ret;
+
+	return genphy_read_status(phydev);
+}
+
 static int kszphy_get_sset_count(struct phy_device *phydev)
 {
 	return ARRAY_SIZE(kszphy_hw_stats);
@@ -1190,6 +1376,167 @@ static int kszphy_probe(struct phy_device *phydev)
 	return 0;
 }
 
+static int ksz886x_cable_test_start(struct phy_device *phydev)
+{
+	if (phydev->dev_flags & MICREL_KSZ8_P1_ERRATA)
+		return -EOPNOTSUPP;
+
+	/* If autoneg is enabled, we won't be able to test cross pair
+	 * short. In this case, the PHY will "detect" a link and
+	 * confuse the internal state machine - disable auto neg here.
+	 * If autoneg is disabled, we should set the speed to 10mbit.
+	 */
+	return phy_clear_bits(phydev, MII_BMCR, BMCR_ANENABLE | BMCR_SPEED100);
+}
+
+static int ksz886x_cable_test_result_trans(u16 status)
+{
+	switch (FIELD_GET(KSZ8081_LMD_STAT_MASK, status)) {
+	case KSZ8081_LMD_STAT_NORMAL:
+		return ETHTOOL_A_CABLE_RESULT_CODE_OK;
+	case KSZ8081_LMD_STAT_SHORT:
+		return ETHTOOL_A_CABLE_RESULT_CODE_SAME_SHORT;
+	case KSZ8081_LMD_STAT_OPEN:
+		return ETHTOOL_A_CABLE_RESULT_CODE_OPEN;
+	case KSZ8081_LMD_STAT_FAIL:
+		fallthrough;
+	default:
+		return ETHTOOL_A_CABLE_RESULT_CODE_UNSPEC;
+	}
+}
+
+static bool ksz886x_cable_test_failed(u16 status)
+{
+	return FIELD_GET(KSZ8081_LMD_STAT_MASK, status) ==
+		KSZ8081_LMD_STAT_FAIL;
+}
+
+static bool ksz886x_cable_test_fault_length_valid(u16 status)
+{
+	switch (FIELD_GET(KSZ8081_LMD_STAT_MASK, status)) {
+	case KSZ8081_LMD_STAT_OPEN:
+		fallthrough;
+	case KSZ8081_LMD_STAT_SHORT:
+		return true;
+	}
+	return false;
+}
+
+static int ksz886x_cable_test_fault_length(u16 status)
+{
+	int dt;
+
+	/* According to the data sheet the distance to the fault is
+	 * DELTA_TIME * 0.4 meters.
+	 */
+	dt = FIELD_GET(KSZ8081_LMD_DELTA_TIME_MASK, status);
+
+	return (dt * 400) / 10;
+}
+
+static int ksz886x_cable_test_wait_for_completion(struct phy_device *phydev)
+{
+	int val, ret;
+
+	ret = phy_read_poll_timeout(phydev, KSZ8081_LMD, val,
+				    !(val & KSZ8081_LMD_ENABLE_TEST),
+				    30000, 100000, true);
+
+	return ret < 0 ? ret : 0;
+}
+
+static int ksz886x_cable_test_one_pair(struct phy_device *phydev, int pair)
+{
+	static const int ethtool_pair[] = {
+		ETHTOOL_A_CABLE_PAIR_A,
+		ETHTOOL_A_CABLE_PAIR_B,
+	};
+	int ret, val, mdix;
+
+	/* There is no way to choice the pair, like we do one ksz9031.
+	 * We can workaround this limitation by using the MDI-X functionality.
+	 */
+	if (pair == 0)
+		mdix = ETH_TP_MDI;
+	else
+		mdix = ETH_TP_MDI_X;
+
+	switch (phydev->phy_id & MICREL_PHY_ID_MASK) {
+	case PHY_ID_KSZ8081:
+		ret = ksz8081_config_mdix(phydev, mdix);
+		break;
+	case PHY_ID_KSZ886X:
+		ret = ksz886x_config_mdix(phydev, mdix);
+		break;
+	default:
+		ret = -ENODEV;
+	}
+
+	if (ret)
+		return ret;
+
+	/* Now we are ready to fire. This command will send a 100ns pulse
+	 * to the pair.
+	 */
+	ret = phy_write(phydev, KSZ8081_LMD, KSZ8081_LMD_ENABLE_TEST);
+	if (ret)
+		return ret;
+
+	ret = ksz886x_cable_test_wait_for_completion(phydev);
+	if (ret)
+		return ret;
+
+	val = phy_read(phydev, KSZ8081_LMD);
+	if (val < 0)
+		return val;
+
+	if (ksz886x_cable_test_failed(val))
+		return -EAGAIN;
+
+	ret = ethnl_cable_test_result(phydev, ethtool_pair[pair],
+				      ksz886x_cable_test_result_trans(val));
+	if (ret)
+		return ret;
+
+	if (!ksz886x_cable_test_fault_length_valid(val))
+		return 0;
+
+	return ethnl_cable_test_fault_length(phydev, ethtool_pair[pair],
+					     ksz886x_cable_test_fault_length(val));
+}
+
+static int ksz886x_cable_test_get_status(struct phy_device *phydev,
+					 bool *finished)
+{
+	unsigned long pair_mask = 0x3;
+	int retries = 20;
+	int pair, ret;
+
+	*finished = false;
+
+	/* Try harder if link partner is active */
+	while (pair_mask && retries--) {
+		for_each_set_bit(pair, &pair_mask, 4) {
+			ret = ksz886x_cable_test_one_pair(phydev, pair);
+			if (ret == -EAGAIN)
+				continue;
+			if (ret < 0)
+				return ret;
+			clear_bit(pair, &pair_mask);
+		}
+		/* If link partner is in autonegotiation mode it will send 2ms
+		 * of FLPs with at least 6ms of silence.
+		 * Add 2ms sleep to have better chances to hit this silence.
+		 */
+		if (pair_mask)
+			msleep(2);
+	}
+
+	*finished = true;
+
+	return ret;
+}
+
 static struct phy_driver ksphy_driver[] = {
 {
 	.phy_id		= PHY_ID_KS8737,
@@ -1296,11 +1643,14 @@ static struct phy_driver ksphy_driver[] = {
 	.phy_id		= PHY_ID_KSZ8081,
 	.name		= "Micrel KSZ8081 or KSZ8091",
 	.phy_id_mask	= MICREL_PHY_ID_MASK,
+	.flags		= PHY_POLL_CABLE_TEST,
 	/* PHY_BASIC_FEATURES */
 	.driver_data	= &ksz8081_type,
 	.probe		= kszphy_probe,
 	.config_init	= ksz8081_config_init,
 	.soft_reset	= genphy_soft_reset,
+	.config_aneg	= ksz8081_config_aneg,
+	.read_status	= ksz8081_read_status,
 	.config_intr	= kszphy_config_intr,
 	.handle_interrupt = kszphy_handle_interrupt,
 	.get_sset_count = kszphy_get_sset_count,
@@ -1308,6 +1658,8 @@ static struct phy_driver ksphy_driver[] = {
 	.get_stats	= kszphy_get_stats,
 	.suspend	= kszphy_suspend,
 	.resume		= kszphy_resume,
+	.cable_test_start	= ksz886x_cable_test_start,
+	.cable_test_get_status	= ksz886x_cable_test_get_status,
 }, {
 	.phy_id		= PHY_ID_KSZ8061,
 	.name		= "Micrel KSZ8061",
@@ -1396,9 +1748,14 @@ static struct phy_driver ksphy_driver[] = {
 	.phy_id_mask	= MICREL_PHY_ID_MASK,
 	.name		= "Micrel KSZ8851 Ethernet MAC or KSZ886X Switch",
 	/* PHY_BASIC_FEATURES */
+	.flags		= PHY_POLL_CABLE_TEST,
 	.config_init	= kszphy_config_init,
+	.config_aneg	= ksz886x_config_aneg,
+	.read_status	= ksz886x_read_status,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
+	.cable_test_start	= ksz886x_cable_test_start,
+	.cable_test_get_status	= ksz886x_cable_test_get_status,
 }, {
 	.name		= "Micrel KSZ87XX Switch",
 	/* PHY_BASIC_FEATURES */

include/linux/micrel_phy.h

@@ -39,10 +39,26 @@
 /* struct phy_device dev_flags definitions */
 #define MICREL_PHY_50MHZ_CLK	0x00000001
 #define MICREL_PHY_FXEN		0x00000002
+#define MICREL_KSZ8_P1_ERRATA	0x00000003
 
 #define MICREL_KSZ9021_EXTREG_CTRL	0xB
 #define MICREL_KSZ9021_EXTREG_DATA_WRITE	0xC
 #define MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW	0x104
 #define MICREL_KSZ9021_RGMII_RX_DATA_PAD_SCEW	0x105
 
+/* Device specific MII_BMCR (Reg 0) bits */
+/* 1 = HP Auto MDI/MDI-X mode, 0 = Microchip Auto MDI/MDI-X mode */
+#define KSZ886X_BMCR_HP_MDIX			BIT(5)
+/* 1 = Force MDI (transmit on RXP/RXM pins), 0 = Normal operation
+ * (transmit on TXP/TXM pins)
+ */
+#define KSZ886X_BMCR_FORCE_MDI			BIT(4)
+/* 1 = Disable auto MDI-X */
+#define KSZ886X_BMCR_DISABLE_AUTO_MDIX		BIT(3)
+#define KSZ886X_BMCR_DISABLE_FAR_END_FAULT	BIT(2)
+#define KSZ886X_BMCR_DISABLE_TRANSMIT		BIT(1)
+#define KSZ886X_BMCR_DISABLE_LED		BIT(0)
+
+#define KSZ886X_CTRL_MDIX_STAT			BIT(4)
+
 #endif /* _MICREL_PHY_H */

net/dsa/slave.c

@@ -1749,7 +1749,8 @@ static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
 }
 
 /* slave device setup *******************************************************/
-static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
+static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
+				 u32 flags)
 {
 	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
 	struct dsa_switch *ds = dp->ds;
@@ -1760,6 +1761,8 @@ static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
 		return -ENODEV;
 	}
 
+	slave_dev->phydev->dev_flags |= flags;
+
 	return phylink_connect_phy(dp->pl, slave_dev->phydev);
 }
 
@@ -1804,7 +1807,7 @@ static int dsa_slave_phy_setup(struct net_device *slave_dev)
 		/* We could not connect to a designated PHY or SFP, so try to
 		 * use the switch internal MDIO bus instead
 		 */
-		ret = dsa_slave_phy_connect(slave_dev, dp->index);
+		ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
 		if (ret) {
 			netdev_err(slave_dev,
 				   "failed to connect to port %d: %d\n",