Messages in this thread | | | Date | Tue, 21 Mar 2023 21:19:39 -0700 | From | Richard Cochran <> | Subject | Re: [PATCH net-next] net: ethernet: ti: am65-cpts: adjust estf following ptp changes |
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On Tue, Mar 21, 2023 at 11:56:00AM +0530, Siddharth Vadapalli wrote: > From: Grygorii Strashko <grygorii.strashko@ti.com> > > When the CPTS clock is synced/adjusted by running linuxptp (ptp4l/phc2sys), > it will cause the TSN EST schedule to drift away over time. This is because > the schedule is driven by the EstF periodic counter whose pulse length is > defined in ref_clk cycles and it does not automatically sync to CPTS clock. > _______ > _| > ^ > expected cycle start time boundary > _______________ > _|_|___|_| > ^ > EstF drifted away -> direction > > To fix it, the same PPM adjustment has to be applied to EstF as done to the > PHC CPTS clock, in order to correct the TSN EST cycle length and keep them > in sync. > > Drifted cycle: > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635968230373377017 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635968230373877017 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635968230374377017 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635968230374877017 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635968230375377017 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635968230375877023 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635968230376377018 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635968230376877018 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635968230377377018 > > Stable cycle: > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635966863193375473 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635966863193875473 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635966863194375473 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635966863194875473 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635966863195375473 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635966863195875473 > AM65_CPTS_EVT: 7 e1:01770001 e2:000000ff t:1635966863196375473 > > Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> > Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
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