[PATCH net-next v4 11/14] net: dsa: b53: prevent GMII_PORT_OVERRIDE_CTRL access on BCM5325
From: Álvaro Fernández Rojas <hidden>
Date: 2025-06-14 08:00:21
Also in:
lkml
Subsystem:
broadcom b53/sf2 ethernet switch driver, networking drivers, networking [dsa], the rest · Maintainers:
Florian Fainelli, Jonas Gorski, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Vladimir Oltean, Linus Torvalds
BCM5325 doesn't implement GMII_PORT_OVERRIDE_CTRL register so we should
avoid reading or writing it.
PORT_OVERRIDE_RX_FLOW and PORT_OVERRIDE_TX_FLOW aren't defined on BCM5325
and we should use PORT_OVERRIDE_LP_FLOW_25 instead.
Fixes: 5e004460f874 ("net: dsa: b53: Add helper to set link parameters")
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Álvaro Fernández Rojas <redacted>
---
drivers/net/dsa/b53/b53_common.c | 21 +++++++++++++++++----
drivers/net/dsa/b53/b53_regs.h | 1 +
2 files changed, 18 insertions(+), 4 deletions(-)
v4: no changes
v3: no changes
v2: no changes
diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 2bcbb003b1fd..034e36b351c9 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c@@ -1279,6 +1279,8 @@ static void b53_force_link(struct b53_device *dev, int port, int link) if (port == dev->imp_port) { off = B53_PORT_OVERRIDE_CTRL; val = PORT_OVERRIDE_EN; + } else if (is5325(dev)) { + return; } else { off = B53_GMII_PORT_OVERRIDE_CTRL(port); val = GMII_PO_EN;
@@ -1303,6 +1305,8 @@ static void b53_force_port_config(struct b53_device *dev, int port, if (port == dev->imp_port) { off = B53_PORT_OVERRIDE_CTRL; val = PORT_OVERRIDE_EN; + } else if (is5325(dev)) { + return; } else { off = B53_GMII_PORT_OVERRIDE_CTRL(port); val = GMII_PO_EN;
@@ -1333,10 +1337,19 @@ static void b53_force_port_config(struct b53_device *dev, int port, return; } - if (rx_pause) - reg |= PORT_OVERRIDE_RX_FLOW; - if (tx_pause) - reg |= PORT_OVERRIDE_TX_FLOW; + if (rx_pause) { + if (is5325(dev)) + reg |= PORT_OVERRIDE_LP_FLOW_25; + else + reg |= PORT_OVERRIDE_RX_FLOW; + } + + if (tx_pause) { + if (is5325(dev)) + reg |= PORT_OVERRIDE_LP_FLOW_25; + else + reg |= PORT_OVERRIDE_TX_FLOW; + } b53_write8(dev, B53_CTRL_PAGE, off, reg); }
diff --git a/drivers/net/dsa/b53/b53_regs.h b/drivers/net/dsa/b53/b53_regs.h
index 896684d7f594..ab15f36a135a 100644
--- a/drivers/net/dsa/b53/b53_regs.h
+++ b/drivers/net/dsa/b53/b53_regs.h@@ -95,6 +95,7 @@ #define PORT_OVERRIDE_SPEED_10M (0 << PORT_OVERRIDE_SPEED_S) #define PORT_OVERRIDE_SPEED_100M (1 << PORT_OVERRIDE_SPEED_S) #define PORT_OVERRIDE_SPEED_1000M (2 << PORT_OVERRIDE_SPEED_S) +#define PORT_OVERRIDE_LP_FLOW_25 BIT(3) /* BCM5325 only */ #define PORT_OVERRIDE_RV_MII_25 BIT(4) /* BCM5325 only */ #define PORT_OVERRIDE_RX_FLOW BIT(4) #define PORT_OVERRIDE_TX_FLOW BIT(5)
--
2.39.5