Messages in this thread Patch in this message | | | From | Min Li <> | Subject | [PATCH net-next v7 3/5] ptp: clockmatrix: dco input-to-output delay is 20 FOD cycles + 8ns | Date | Thu, 14 Dec 2023 10:24:13 -0500 |
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From: Min Li <min.li.xe@renesas.com>
Set dco input-to-output delay is 20 FOD cycles + 8ns
Signed-off-by: Min Li <min.li.xe@renesas.com> --- drivers/ptp/ptp_clockmatrix.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c index d069b6e451ef..21f3a2c179f5 100644 --- a/drivers/ptp/ptp_clockmatrix.c +++ b/drivers/ptp/ptp_clockmatrix.c @@ -2165,7 +2165,7 @@ static int configure_channel_pll(struct idtcm_channel *channel) /* * Compensate for the PTP DCO input-to-output delay. - * This delay is 18 FOD cycles. + * This delay is 20 FOD cycles + 8ns. */ static u32 idtcm_get_dco_delay(struct idtcm_channel *channel) { @@ -2196,7 +2196,7 @@ static u32 idtcm_get_dco_delay(struct idtcm_channel *channel) fodFreq = (u32)div_u64(m, n); if (fodFreq >= 500000000) - return (u32)div_u64(18 * (u64)NSEC_PER_SEC, fodFreq); + return (u32)div_u64(20 * (u64)NSEC_PER_SEC, fodFreq) + 8; return 0; } -- 2.39.2
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