--- zzzz-none-000/linux-3.10.107/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c	2021-02-04 17:41:59.000000000 +0000
@@ -45,8 +45,8 @@
 	data = (1000000000ULL / 50000000);
 
 	/* 0.465ns accuracy */
-	if (value & PTP_TCR_TSCTRLSSR)
-		data = (data * 100) / 465;
+	if (!(value & PTP_TCR_TSCTRLSSR))
+		data = (data * 1000) / 465;
 
 	writel(data, ioaddr + PTP_SSIR);
 }