[PATCH next-next] net: dsa: qca8k: Add support for force mode for fixed link topology
From: George Moussalem via B4 Relay
Date: Wed Jun 03 2026 - 04:00:25 EST
From: George Moussalem <george.moussalem@xxxxxxxxxxx>
A fixed link topology is commonly used to connect this switch (on port
0 or 6) to a SoC's MAC over SGMII. When inband negotiation is not used,
the switch needs to be configured to operate in force mode. As such,
enable support for force mode.
Signed-off-by: George Moussalem <george.moussalem@xxxxxxxxxxx>
---
drivers/net/dsa/qca/qca8k-8xxx.c | 6 +++++-
drivers/net/dsa/qca/qca8k.h | 1 +
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/net/dsa/qca/qca8k-8xxx.c b/drivers/net/dsa/qca/qca8k-8xxx.c
index a36b8b07030e..3dbd18ab8638 100644
--- a/drivers/net/dsa/qca/qca8k-8xxx.c
+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
@@ -1611,10 +1611,14 @@ static int qca8k_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode,
if (priv->ports_config.sgmii_tx_clk_falling_edge)
val |= QCA8K_PORT0_PAD_SGMII_TXCLK_FALLING_EDGE;
+ if (neg_mode == PHYLINK_PCS_NEG_OUTBAND)
+ val |= QCA8K_PORT_PAD_SGMII_FORCE_MODE;
+
if (val)
ret = qca8k_rmw(priv, reg,
QCA8K_PORT0_PAD_SGMII_RXCLK_FALLING_EDGE |
- QCA8K_PORT0_PAD_SGMII_TXCLK_FALLING_EDGE,
+ QCA8K_PORT0_PAD_SGMII_TXCLK_FALLING_EDGE |
+ QCA8K_PORT_PAD_SGMII_FORCE_MODE,
val);
return 0;
diff --git a/drivers/net/dsa/qca/qca8k.h b/drivers/net/dsa/qca/qca8k.h
index 1a00e2f62fef..956338893032 100644
--- a/drivers/net/dsa/qca/qca8k.h
+++ b/drivers/net/dsa/qca/qca8k.h
@@ -58,6 +58,7 @@
#define QCA8K_PORT_PAD_RGMII_TX_DELAY_EN BIT(25)
#define QCA8K_PORT_PAD_RGMII_RX_DELAY_EN BIT(24)
#define QCA8K_PORT_PAD_SGMII_EN BIT(7)
+#define QCA8K_PORT_PAD_SGMII_FORCE_MODE BIT(3)
#define QCA8K_REG_PWS 0x010
#define QCA8K_PWS_POWER_ON_SEL BIT(31)
/* This reg is only valid for QCA832x and toggle the package
---
base-commit: b7bee4ca5688e30ca50fbc87b1b8f7eed7006c17
change-id: 20260603-qca8337-force-mode-fbcba5296446
Best regards,
--
George Moussalem <george.moussalem@xxxxxxxxxxx>