diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c index 68f87ecb8a76..5fd4b5271f9a 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c @@ -98,9 +98,11 @@ #define IXGBE_OVERFLOW_PERIOD (HZ * 30) #define IXGBE_PTP_TX_TIMEOUT (HZ * 15) -#ifndef NSECS_PER_SEC -#define NSECS_PER_SEC 1000000000ULL -#endif +/* half of a one second clock period, for use with PPS signal. We have to use + * this instead of something pre-defined like IXGBE_PTP_PPS_HALF_SECOND, in + * order to force at least 64bits of precision for shifting + */ +#define IXGBE_PTP_PPS_HALF_SECOND 500000000ULL /** * ixgbe_ptp_setup_sdp @@ -146,8 +148,8 @@ static void ixgbe_ptp_setup_sdp(struct ixgbe_adapter *adapter) IXGBE_TSAUXC_SDP0_INT); /* clock period (or pulse length) */ - clktiml = (u32)(NSECS_PER_SEC << shift); - clktimh = (u32)((NSECS_PER_SEC << shift) >> 32); + clktiml = (u32)(IXGBE_PTP_PPS_HALF_SECOND << shift); + clktimh = (u32)((IXGBE_PTP_PPS_HALF_SECOND << shift) >> 32); /* * Account for the cyclecounter wrap-around value by @@ -158,8 +160,8 @@ static void ixgbe_ptp_setup_sdp(struct ixgbe_adapter *adapter) clock_edge |= (u64)IXGBE_READ_REG(hw, IXGBE_SYSTIMH) << 32; ns = timecounter_cyc2time(&adapter->tc, clock_edge); - div_u64_rem(ns, NSECS_PER_SEC, &rem); - clock_edge += ((NSECS_PER_SEC - (u64)rem) << shift); + div_u64_rem(ns, IXGBE_PTP_PPS_HALF_SECOND, &rem); + clock_edge += ((IXGBE_PTP_PPS_HALF_SECOND - (u64)rem) << shift); /* specify the initial clock start time */ trgttiml = (u32)clock_edge; |