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driver:stmmac: Adjust time stamp increase for 0.465 ns accurate only when Time stamp binary rollover is set. 

The synopsys spec says When TSCRLSSR is cleard, the rollover value of
sub-second register is 0x7FFFFFFF(0.465 ns per clock).

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sonic Zhang 2013-09-03 13:55:07 +08:00 committed by David S. Miller
parent c08751c851
commit 0cf915809c
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
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@ -45,8 +45,8 @@ static void stmmac_config_sub_second_increment(void __iomem *ioaddr)
data = (1000000000ULL / 50000000); data = (1000000000ULL / 50000000);
/* 0.465ns accuracy */ /* 0.465ns accuracy */
if (value & PTP_TCR_TSCTRLSSR) if (!(value & PTP_TCR_TSCTRLSSR))
data = (data * 100) / 465; data = (data * 1000) / 465;
writel(data, ioaddr + PTP_SSIR); writel(data, ioaddr + PTP_SSIR);
} }