[PATCH net-next v7 3/5] ptp: clockmatrix: dco input-to-output delay is 20 FOD cycles + 8ns
From: Min Li <hidden>
Date: 2023-12-14 15:24:47
Also in:
lkml
Subsystem:
networking drivers, ptp hardware clock support, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Richard Cochran, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2024-05-03 · RE: [PATCH net-next v7 3/5] ptp: clockmatrix: dco input-to-output delay is 20 FOD cycles + 8ns · Min Li <hidden>
- 2024-05-02 · Re: [PATCH net-next v7 3/5] ptp: clockmatrix: dco input-to-output delay is 20 FOD cycles + 8ns · Horatiu Vultur <horatiu.vultur@microchip.com>
- 2024-05-01 · [PATCH net-next v7 3/5] ptp: clockmatrix: dco input-to-output delay is 20 FOD cycles + 8ns · Min Li <hidden>
- 2024-03-18 · [PATCH net-next v7 3/5] ptp: clockmatrix: dco input-to-output delay is 20 FOD cycles + 8ns · Min Li <hidden>
- 2024-03-14 · [PATCH net-next v7 3/5] ptp: clockmatrix: dco input-to-output delay is 20 FOD cycles + 8ns · Min Li <hidden>
From: Min Li <redacted> Set dco input-to-output delay is 20 FOD cycles + 8ns Signed-off-by: Min Li <redacted> --- 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