[PATCH net-next v2 3/3] net: ethernet: ti: am65-cpts: adjust pps following ptp changes

[Roger Quadros]

On 16/01/2023 10:55, Siddharth Vadapalli wrote:
> From: Grygorii Strashko <grygorii.strashko at ti.com>
> 
> When CPTS clock is sync/adjusted by running linuxptp (ptp4l) it will cause
> PPS jitter as Genf running PPS is not adjusted.
> 
> The same PPM adjustment has to be applied to GenF as to PHC clock to
> correct PPS length and keep them in sync.
> 
> Testing:
>  Master:
>   ptp4l -P -2 -H -i eth0 -l 6 -m -q -p /dev/ptp1 -f ptp.cfg &
>   testptp -d /dev/ptp1 -P 1
>   ppstest /dev/pps0
> 
>  Slave:
>   linuxptp/ptp4l -P -2 -H -i eth0 -l 6 -m -q -p /dev/ptp1 -f ptp1.cfg -s &
>     <port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED;>
>   testptp -d /dev/ptp1 -P 1
>   ppstest /dev/pps0
> 
> Master log:
> source 0 - assert 620.000000689, sequence: 530
> source 0 - assert 621.000000689, sequence: 531
> source 0 - assert 622.000000689, sequence: 532
> source 0 - assert 623.000000689, sequence: 533
> source 0 - assert 624.000000689, sequence: 534
> source 0 - assert 625.000000689, sequence: 535
> source 0 - assert 626.000000689, sequence: 536
> source 0 - assert 627.000000689, sequence: 537
> source 0 - assert 628.000000689, sequence: 538
> source 0 - assert 629.000000689, sequence: 539
> source 0 - assert 630.000000689, sequence: 540
> source 0 - assert 631.000000689, sequence: 541
> source 0 - assert 632.000000689, sequence: 542
> source 0 - assert 633.000000689, sequence: 543
> source 0 - assert 634.000000689, sequence: 544
> source 0 - assert 635.000000689, sequence: 545
> 
> Slave log:
> source 0 - assert 620.000000706, sequence: 252
> source 0 - assert 621.000000709, sequence: 253
> source 0 - assert 622.000000707, sequence: 254
> source 0 - assert 623.000000707, sequence: 255
> source 0 - assert 624.000000706, sequence: 256
> source 0 - assert 625.000000705, sequence: 257
> source 0 - assert 626.000000709, sequence: 258
> source 0 - assert 627.000000709, sequence: 259
> source 0 - assert 628.000000707, sequence: 260
> source 0 - assert 629.000000706, sequence: 261
> source 0 - assert 630.000000710, sequence: 262
> source 0 - assert 631.000000708, sequence: 263
> source 0 - assert 632.000000705, sequence: 264
> source 0 - assert 633.000000710, sequence: 265
> source 0 - assert 634.000000708, sequence: 266
> source 0 - assert 635.000000707, sequence: 267
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko at ti.com>
> Signed-off-by: Siddharth Vadapalli <s-vadapalli at ti.com>
> ---
>  drivers/net/ethernet/ti/am65-cpts.c | 59 ++++++++++++++++++++++++-----
>  1 file changed, 49 insertions(+), 10 deletions(-)

Reviewed-by: Roger Quadros <rogerq at kernel.org>