[Linuxptp-users] Synchronization fault with stmmac

[BELAOUAD M. <mbe...@ad...>]

Hi all :), 

I am new here but following you for 2 months since the beginning of my internship :p. 
Enough for the introduction, let's get real. I am using a Cyclone V from Altera (dual ARM Cortex A9 + FPGA) which includes a GMAC. 
The MAC supports HW timestamping and is used with the stmmac driver (same IP but slightly modified). 

My setup is the following: 
PC (SW timestamping) <--------> switch <------> Board (HW timestamping) 

ptp4l gives a Synchronization Fault with Hardware timestamping. Everything is fine with Software timestamping. 
I tried to set pi_offset_const to 1.0 but the clock still jumps backward somehow. 

Could you please help me on this matter and point me to possible sources of this problem? 
On a side note, does anyone use linuxptp with HW timestamping on stmmac successfully? 

Below is the log with -l 7. Please let me know if you need further information. 

Thanks, 

Mohamed 

# ./ptp4l -i eth0 -H -f test.cfg 
ptp4l[147.489]: selected /dev/ptp0 as PTP clock 
ptp4l[147.515]: port 1: INITIALIZING to LISTENING on INITIALIZE 
ptp4l[147.515]: port 0: INITIALIZING to LISTENING on INITIALIZE 
ptp4l[148.459]: port 1: new foreign master d48564.fffe.0b41d0-1 
ptp4l[152.457]: selected best master clock d48564.fffe.0b41d0 
ptp4l[152.457]: foreign master not using PTP timescale 
ptp4l[152.458]: port 1: LISTENING to UNCALIBRATED on RS_SLAVE 
ptp4l[153.546]: master offset -1395073665119852258 s0 freq +0 path delay 85828161 
ptp4l[154.459]: master offset -1395073665720073020 s1 freq -32767999 path delay 85828161 
ptp4l[155.459]: master offset -587136672 s2 freq -32767999 path delay 85828161 
ptp4l[155.459]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED 
ptp4l[156.458]: clockcheck: clock jumped backward or running slower than expected! 
ptp4l[156.458]: master offset -1237588174 s0 freq -32767999 path delay 149160250 
ptp4l[156.459]: port 1: SLAVE to UNCALIBRATED on SYNCHRONIZATION_FAULT 
ptp4l[157.458]: clockcheck: clock jumped backward or running slower than expected! 
ptp4l[157.458]: master offset -1824727375 s0 freq -32767999 path delay 149160250 
ptp4l[158.457]: clockcheck: clock jumped backward or running slower than expected! 
ptp4l[158.458]: master offset -2348516905 s0 freq -32767999 path delay 85828161 
ptp4l[159.457]: clockcheck: clock jumped backward or running slower than expected! 
ptp4l[159.457]: master offset -2935665289 s0 freq -32767999 path delay 85828161 
ptp4l[160.457]: clockcheck: clock jumped backward or running slower than expected! 
ptp4l[160.457]: master offset -3522777179 s0 freq -32767999 path delay 85828161 
ptp4l[161.456]: clockcheck: clock jumped backward or running slower than expected! 
ptp4l[161.456]: master offset -4148584796 s0 freq -32767999 path delay 124477361 
ptp4l[162.533]: clockcheck: clock jumped backward or running slower than expected!