stmmac read mac form eeprom

hc

2023-02-14 b625cdcd68479b3d540a915785b6d9809b52a2f8

 kernel/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
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@@ -159,20 +159,15 @@
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 static void get_systime(void __iomem *ioaddr, u64 *systime)
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 {
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-	u64 ns, sec0, sec1;
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+	u64 ns;
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-	/* Get the TSS value */
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-	sec1 = readl_relaxed(ioaddr + PTP_STSR);
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-	do {
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-		sec0 = sec1;
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-		/* Get the TSSS value */
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-		ns = readl_relaxed(ioaddr + PTP_STNSR);
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-		/* Get the TSS value */
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-		sec1 = readl_relaxed(ioaddr + PTP_STSR);
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-	} while (sec0 != sec1);
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+	/* Get the TSSS value */
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+	ns = readl(ioaddr + PTP_STNSR);
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+	/* Get the TSS and convert sec time value to nanosecond */
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+	ns += readl(ioaddr + PTP_STSR) * 1000000000ULL;
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 	if (systime)
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-		*systime = ns + (sec1 * 1000000000ULL);
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+		*systime = ns;
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 }
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 const struct stmmac_hwtimestamp stmmac_ptp = {