net: dsa: mv88e6xxx: Don't force link when using in-band-status

When a port is configured with 'managed = "in-band-status"' switch chips
like the 88E6390 need to propagate the SERDES link state to the MAC
because the link state is not correctly detected. This causes problems
on the 88E6185/88E6097 where the link partner won't see link state
changes because we're forcing the link.

To address this introduce a new device specific op port_sync_link() and
push the logic from mv88e6xxx_mac_link_up() into that. Provide an
implementation for the 88E6185 like devices which doesn't force the
link.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

4 files changed, 74 insertions, 4 deletions

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index e8258db8c21e..296932b2b80d 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -727,8 +727,8 @@ static void mv88e6xxx_mac_link_down(struct dsa_switch *ds, int port,
 
 	mv88e6xxx_reg_lock(chip);
 	if ((!mv88e6xxx_port_ppu_updates(chip, port) ||
-	     mode == MLO_AN_FIXED) && ops->port_set_link)
-		err = ops->port_set_link(chip, port, LINK_FORCED_DOWN);
+	     mode == MLO_AN_FIXED) && ops->port_sync_link)
+		err = ops->port_sync_link(chip, port, mode, false);
 	mv88e6xxx_reg_unlock(chip);
 
 	if (err)
@@ -768,8 +768,8 @@ static void mv88e6xxx_mac_link_up(struct dsa_switch *ds, int port,
 				goto error;
 		}
 
-		if (ops->port_set_link)
-			err = ops->port_set_link(chip, port, LINK_FORCED_UP);
+		if (ops->port_sync_link)
+			err = ops->port_sync_link(chip, port, mode, true);
 	}
 error:
 	mv88e6xxx_reg_unlock(chip);
@@ -3210,6 +3210,7 @@ static const struct mv88e6xxx_ops mv88e6085_ops = {
 	.phy_read = mv88e6185_phy_ppu_read,
 	.phy_write = mv88e6185_phy_ppu_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
@@ -3249,6 +3250,7 @@ static const struct mv88e6xxx_ops mv88e6095_ops = {
 	.phy_read = mv88e6185_phy_ppu_read,
 	.phy_write = mv88e6185_phy_ppu_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6185_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_set_frame_mode = mv88e6085_port_set_frame_mode,
 	.port_set_egress_floods = mv88e6185_port_set_egress_floods,
@@ -3279,6 +3281,7 @@ static const struct mv88e6xxx_ops mv88e6097_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6185_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
@@ -3317,6 +3320,7 @@ static const struct mv88e6xxx_ops mv88e6123_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_set_frame_mode = mv88e6085_port_set_frame_mode,
 	.port_set_egress_floods = mv88e6352_port_set_egress_floods,
@@ -3351,6 +3355,7 @@ static const struct mv88e6xxx_ops mv88e6131_ops = {
 	.phy_read = mv88e6185_phy_ppu_read,
 	.phy_write = mv88e6185_phy_ppu_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
@@ -3392,6 +3397,7 @@ static const struct mv88e6xxx_ops mv88e6141_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6341_port_set_speed_duplex,
 	.port_max_speed_mode = mv88e6341_port_max_speed_mode,
@@ -3443,6 +3449,7 @@ static const struct mv88e6xxx_ops mv88e6161_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
@@ -3484,6 +3491,7 @@ static const struct mv88e6xxx_ops mv88e6165_ops = {
 	.phy_read = mv88e6165_phy_read,
 	.phy_write = mv88e6165_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_disable_learn_limit = mv88e6xxx_port_disable_learn_limit,
 	.port_disable_pri_override = mv88e6xxx_port_disable_pri_override,
@@ -3518,6 +3526,7 @@ static const struct mv88e6xxx_ops mv88e6171_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6352_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
@@ -3560,6 +3569,7 @@ static const struct mv88e6xxx_ops mv88e6172_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6352_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6352_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
@@ -3611,6 +3621,7 @@ static const struct mv88e6xxx_ops mv88e6175_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6352_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
@@ -3653,6 +3664,7 @@ static const struct mv88e6xxx_ops mv88e6176_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6352_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6352_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
@@ -3706,6 +3718,7 @@ static const struct mv88e6xxx_ops mv88e6185_ops = {
 	.phy_read = mv88e6185_phy_ppu_read,
 	.phy_write = mv88e6185_phy_ppu_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6185_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_set_frame_mode = mv88e6085_port_set_frame_mode,
 	.port_set_egress_floods = mv88e6185_port_set_egress_floods,
@@ -3743,6 +3756,7 @@ static const struct mv88e6xxx_ops mv88e6190_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6390_port_set_speed_duplex,
 	.port_max_speed_mode = mv88e6390_port_max_speed_mode,
@@ -3802,6 +3816,7 @@ static const struct mv88e6xxx_ops mv88e6190x_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6390x_port_set_speed_duplex,
 	.port_max_speed_mode = mv88e6390x_port_max_speed_mode,
@@ -3861,6 +3876,7 @@ static const struct mv88e6xxx_ops mv88e6191_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6390_port_set_speed_duplex,
 	.port_max_speed_mode = mv88e6390_port_max_speed_mode,
@@ -3920,6 +3936,7 @@ static const struct mv88e6xxx_ops mv88e6240_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6352_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6352_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
@@ -3978,6 +3995,7 @@ static const struct mv88e6xxx_ops mv88e6250_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6352_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6250_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
@@ -4015,6 +4033,7 @@ static const struct mv88e6xxx_ops mv88e6290_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6390_port_set_speed_duplex,
 	.port_max_speed_mode = mv88e6390_port_max_speed_mode,
@@ -4076,6 +4095,7 @@ static const struct mv88e6xxx_ops mv88e6320_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
@@ -4118,6 +4138,7 @@ static const struct mv88e6xxx_ops mv88e6321_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
@@ -4158,6 +4179,7 @@ static const struct mv88e6xxx_ops mv88e6341_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6341_port_set_speed_duplex,
 	.port_max_speed_mode = mv88e6341_port_max_speed_mode,
@@ -4211,6 +4233,7 @@ static const struct mv88e6xxx_ops mv88e6350_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6352_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
@@ -4251,6 +4274,7 @@ static const struct mv88e6xxx_ops mv88e6351_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6352_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6185_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
@@ -4295,6 +4319,7 @@ static const struct mv88e6xxx_ops mv88e6352_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6352_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6352_port_set_speed_duplex,
 	.port_tag_remap = mv88e6095_port_tag_remap,
@@ -4355,6 +4380,7 @@ static const struct mv88e6xxx_ops mv88e6390_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6390_port_set_speed_duplex,
 	.port_max_speed_mode = mv88e6390_port_max_speed_mode,
@@ -4418,6 +4444,7 @@ static const struct mv88e6xxx_ops mv88e6390x_ops = {
 	.phy_read = mv88e6xxx_g2_smi_phy_read,
 	.phy_write = mv88e6xxx_g2_smi_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
+	.port_sync_link = mv88e6xxx_port_sync_link,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed_duplex = mv88e6390x_port_set_speed_duplex,
 	.port_max_speed_mode = mv88e6390x_port_max_speed_mode,
diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index 7faa61b7f8f8..3543055bcb51 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -417,6 +417,10 @@ struct mv88e6xxx_ops {
 	 */
 	int (*port_set_link)(struct mv88e6xxx_chip *chip, int port, int link);
 
+	/* Synchronise the port link state with that of the SERDES
+	 */
+	int (*port_sync_link)(struct mv88e6xxx_chip *chip, int port, unsigned int mode, bool isup);
+
 #define PAUSE_ON		1
 #define PAUSE_OFF		0
 
diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index 8128dc607cf4..77a5fd1798cd 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -162,6 +162,42 @@ int mv88e6xxx_port_set_link(struct mv88e6xxx_chip *chip, int port, int link)
 	return 0;
 }
 
+int mv88e6xxx_port_sync_link(struct mv88e6xxx_chip *chip, int port, unsigned int mode, bool isup)
+{
+	const struct mv88e6xxx_ops *ops = chip->info->ops;
+	int err = 0;
+	int link;
+
+	if (isup)
+		link = LINK_FORCED_UP;
+	else
+		link = LINK_FORCED_DOWN;
+
+	if (ops->port_set_link)
+		err = ops->port_set_link(chip, port, link);
+
+	return err;
+}
+
+int mv88e6185_port_sync_link(struct mv88e6xxx_chip *chip, int port, unsigned int mode, bool isup)
+{
+	const struct mv88e6xxx_ops *ops = chip->info->ops;
+	int err = 0;
+	int link;
+
+	if (mode == MLO_AN_INBAND)
+		link = LINK_UNFORCED;
+	else if (isup)
+		link = LINK_FORCED_UP;
+	else
+		link = LINK_FORCED_DOWN;
+
+	if (ops->port_set_link)
+		err = ops->port_set_link(chip, port, link);
+
+	return err;
+}
+
 static int mv88e6xxx_port_set_speed_duplex(struct mv88e6xxx_chip *chip,
 					   int port, int speed, bool alt_bit,
 					   bool force_bit, int duplex)
diff --git a/drivers/net/dsa/mv88e6xxx/port.h b/drivers/net/dsa/mv88e6xxx/port.h
index 44d76ac973f6..500e1d4896ff 100644
--- a/drivers/net/dsa/mv88e6xxx/port.h
+++ b/drivers/net/dsa/mv88e6xxx/port.h
@@ -298,6 +298,9 @@ int mv88e6390_port_set_rgmii_delay(struct mv88e6xxx_chip *chip, int port,
 
 int mv88e6xxx_port_set_link(struct mv88e6xxx_chip *chip, int port, int link);
 
+int mv88e6xxx_port_sync_link(struct mv88e6xxx_chip *chip, int port, unsigned int mode, bool isup);
+int mv88e6185_port_sync_link(struct mv88e6xxx_chip *chip, int port, unsigned int mode, bool isup);
+
 int mv88e6065_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 				    int speed, int duplex);
 int mv88e6185_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,