--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
@@ -64,6 +64,17 @@
 #define NSS_COMMON_CLK_DIV_SGMII_100		4
 #define NSS_COMMON_CLK_DIV_SGMII_10		49
 
+#define QSGMII_PCS_ALL_CH_CTL			0x80
+#define QSGMII_PCS_CH_SPEED_FORCE		0x2
+#define QSGMII_PCS_CH_SPEED_10			0x0
+#define QSGMII_PCS_CH_SPEED_100			0x4
+#define QSGMII_PCS_CH_SPEED_1000		0x8
+#define QSGMII_PCS_CH_SPEED_MASK		(QSGMII_PCS_CH_SPEED_FORCE | \
+						 QSGMII_PCS_CH_SPEED_10 | \
+						 QSGMII_PCS_CH_SPEED_100 | \
+						 QSGMII_PCS_CH_SPEED_1000)
+#define QSGMII_PCS_CH_SPEED_SHIFT(x)		(x * 4)
+
 #define QSGMII_PCS_CAL_LCKDT_CTL		0x120
 #define QSGMII_PCS_CAL_LCKDT_CTL_RST		BIT(19)
 
@@ -345,6 +356,12 @@ static int ipq806x_gmac_probe(struct pla
 			     0x1ul << QSGMII_PHY_RX_INPUT_EQU_OFFSET |
 			     0x2ul << QSGMII_PHY_CDR_PI_SLEW_OFFSET |
 			     0xCul << QSGMII_PHY_TX_DRV_AMP_OFFSET);
+
+		regmap_update_bits(gmac->qsgmii_csr,
+				   QSGMII_PCS_ALL_CH_CTL,
+				   QSGMII_PCS_CH_SPEED_MASK <<
+				    QSGMII_PCS_CH_SPEED_SHIFT(gmac->id),
+				   0);
 	}
 
 	plat_dat->has_gmac = true;