diff --git a/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c b/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
index d2268ae76d..768952b472 100644
--- a/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
+++ b/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
@@ -2340,30 +2340,64 @@ static void rtpcs_931x_sds_disable(struct rtpcs_serdes *sds)
 		     RTL931X_SERDES_MODE_CTRL + (sds->id >> 2) * 4, 0x9f);
 }
 
-static void rtpcs_931x_sds_symerr_clear(struct rtpcs_serdes *sds,
+__maybe_unused
+static int rtpcs_931x_sds_fiber_get_symerr(struct rtpcs_serdes *sds,
+					   phy_interface_t mode)
+{
+	int symerr, val, val2;
+
+	switch (mode) {
+	case PHY_INTERFACE_MODE_10GBASER:
+		symerr = rtpcs_sds_read_bits(sds, 0x5, 0x1, 7, 0);
+		break;
+	case PHY_INTERFACE_MODE_1000BASEX:
+		rtpcs_sds_write_bits(sds, 0x41, 0x18, 2, 0, 0x0);
+
+		val = rtpcs_sds_read_bits(sds, 0x41, 0x3, 15, 8);
+		val2 = rtpcs_sds_read_bits(sds, 0x41, 0x2, 15, 0);
+		symerr = (val << 16) | val2;
+		break;
+	default:
+		symerr = -EINVAL;
+	}
+
+	return symerr;
+}
+
+static void rtpcs_931x_sds_clear_symerr(struct rtpcs_serdes *sds,
 					phy_interface_t mode)
 {
 	switch (mode) {
-	case PHY_INTERFACE_MODE_NA:
-		break;
+	case PHY_INTERFACE_MODE_SGMII:
+	case PHY_INTERFACE_MODE_HISGMII:
 	case PHY_INTERFACE_MODE_XGMII:
 		for (int i = 0; i < 4; ++i) {
-			rtpcs_sds_write_bits(sds, 0x41, 24,  2, 0, i);
-			rtpcs_sds_write_bits(sds, 0x41,  3, 15, 8, 0x0);
-			rtpcs_sds_write_bits(sds, 0x41,  2, 15, 0, 0x0);
+			rtpcs_sds_write_bits(sds, 0x41, 0x18, 2, 0, i);
+			rtpcs_sds_write_bits(sds, 0x41, 0x3, 15, 8, 0x0);
+			rtpcs_sds_write_bits(sds, 0x41, 0x2, 15, 0, 0x0);
 		}
 
 		for (int i = 0; i < 4; ++i) {
-			rtpcs_sds_write_bits(sds, 0x81, 24,  2, 0, i);
-			rtpcs_sds_write_bits(sds, 0x81,  3, 15, 8, 0x0);
-			rtpcs_sds_write_bits(sds, 0x81,  2, 15, 0, 0x0);
+			rtpcs_sds_write_bits(sds, 0x81, 0x18, 2, 0, i);
+			rtpcs_sds_write_bits(sds, 0x81, 0x3, 15, 8, 0x0);
+			rtpcs_sds_write_bits(sds, 0x81, 0x2, 15, 0, 0x0);
 		}
 
-		rtpcs_sds_write_bits(sds, 0x41, 0, 15, 0, 0x0);
-		rtpcs_sds_write_bits(sds, 0x41, 1, 15, 8, 0x0);
-		rtpcs_sds_write_bits(sds, 0x81, 0, 15, 0, 0x0);
-		rtpcs_sds_write_bits(sds, 0x81, 1, 15, 8, 0x0);
+		rtpcs_sds_write_bits(sds, 0x41, 0x0, 15, 0, 0x0);
+		rtpcs_sds_write_bits(sds, 0x41, 0x1, 15, 8, 0x0);
+		rtpcs_sds_write_bits(sds, 0x81, 0x0, 15, 0, 0x0);
+		rtpcs_sds_write_bits(sds, 0x81, 0x1, 15, 8, 0x0);
 		break;
+	case PHY_INTERFACE_MODE_1000BASEX:
+		rtpcs_sds_write_bits(sds, 0x41, 0x18, 2, 0, 0x0);
+		rtpcs_sds_write_bits(sds, 0x41, 0x3, 15, 8, 0x0);
+		rtpcs_sds_write_bits(sds, 0x41, 0x2, 15, 0, 0x0);
+		break;
+	case PHY_INTERFACE_MODE_10GBASER:
+		/* to be verified: clear on read? */
+		rtpcs_sds_read_bits(sds, 0x5, 0x1, 7, 0);
+		break;
+	case PHY_INTERFACE_MODE_NA:
 	default:
 		break;
 	}
@@ -2383,7 +2417,7 @@ static void rtpcs_931x_sds_fiber_mode_set(struct rtpcs_serdes *sds,
 	u32 val;
 
 	/* clear symbol error count before changing mode */
-	rtpcs_931x_sds_symerr_clear(sds, mode);
+	rtpcs_931x_sds_clear_symerr(sds, mode);
 
 	rtpcs_931x_sds_disable(sds);