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Commit 0cf91580 authored by Sonic Zhang's avatar Sonic Zhang Committed by David S. Miller
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driver:stmmac: Adjust time stamp increase for 0.465 ns accurate only when Time... 


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: default avatarSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c08751c8

drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c

+2 −2
Original line number Diff line number Diff line
@@ -45,8 +45,8 @@ static void stmmac_config_sub_second_increment(void __iomem *ioaddr) 
	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);

}