imx6ull cpu frequency failed using 1588 time synchronization when operating at 792000

Ethane — Sun, 07 Apr 2024 00:50:37 GMT

I am using the ptp4l tool for time synchronization on imxlinux version 4.1.15, when I increase the cpu frequency to 792000, it skips time, but it doesn't happen when I am using linux 5.15, I would like to ask what changes have been made in the higher version.

Here is the printout of the time skip

root@imx6ull:~# ptp4l -A -4 -H -m -i eth0
ptp4l[182.571]: selected /dev/ptp0 as PTP clock
ptp4l[182.577]: driver changed our HWTSTAMP options
ptp4l[182.578]: tx_type 1 not 1
ptp4l[182.578]: rx_filter 1 not 12
ptp4l[182.579]: port 1: INITIALIZING to LISTENING on INITIALIZE
ptp4l[182.581]: port 0: INITIALIZING to LISTENING on INITIALIZE
ptp4l[190.319]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[190.319]: selected best master clock e67809.fffe.3d93fe
ptp4l[190.320]: assuming the grand master role
ptp4l[194.325]: port 1: new foreign master ce96f5.fffe.4c2be7-1
ptp4l[198.325]: selected best master clock ce96f5.fffe.4c2be7
ptp4l[198.326]: port 1: MASTER to UNCALIBRATED on RS_SLAVE
ptp4l[200.324]: master offset -2434 s0 freq -2876 path delay 1723
ptp4l[201.324]: master offset -2516 s2 freq -2958 path delay 1721
ptp4l[201.325]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l[202.324]: master offset -2598 s2 freq -5556 path delay 1721
ptp4l[203.324]: master offset -7 s2 freq -3744 path delay 1720
ptp4l[204.325]: master offset 781 s2 freq -2958 path delay 1720
ptp4l[205.324]: master offset 789 s2 freq -2716 path delay 1712
ptp4l[206.325]: master offset 2147484114 s2 freq +32767999 path delay 1712
ptp4l[207.325]: master offset -24954283 s2 freq -24957551 path delay 1716
ptp4l[208.325]: master offset -12526340 s2 freq -20015893 path delay 1069
ptp4l[209.325]: master offset -28330 s2 freq -11275785 path delay 1069
ptp4l[210.325]: master offset 14538505 s2 freq +3282551 path delay -2068315
ptp4l[211.325]: master offset 2158479308 s2 freq +32767999 path delay -2068315
ptp4l[212.325]: master offset -13968519 s2 freq -20862922 path delay -2068315
ptp4l[213.325]: master offset 2145937382 s2 freq +32767999 path delay -2068315
ptp4l[214.325]: master offset 2121002525 s2 freq +32767999 path delay -2068315
ptp4l[215.325]: master offset -53833606 s2 freq -32767999 path delay 279566
ptp4l[216.325]: master offset -28931120 s2 freq -32767999 path delay 279566
ptp4l[217.325]: master offset -3931906 s2 freq -15016865 path delay 279566
ptp4l[218.325]: master offset 8588962 s2 freq -3675568 path delay 279566
ptp4l[219.325]: master offset 13242000 s2 freq +3554158 path delay -193292

Re: imx6ull cpu frequency failed using 1588 time synchronization when operating at 792000

JosephAtNXP — Mon, 08 Apr 2024 21:31:53 GMT

Hi,

Thank you for your interest in NXP Semiconductor products,

There are going to be changes in the kernel as well as the driver itself, probably,

You could go through the release notes for every release and look for the code improvements.

You are advised to move to latest BSP which features fixes to issues like this one.

Regards

Re: imx6ull cpu frequency failed using 1588 time synchronization when operating at 792000

Ethane — Thu, 11 Apr 2024 03:17:02 GMT

Problem solved because the fec controller in linux 4.1.15 imx6ul did not add this configuration FEC_QUIRK_BUG_CAPTURE

topic Re: imx6ull cpu frequency failed using 1588 time synchronization when operating at 792000 in i.MX Processors

imx6ull cpu frequency failed using 1588 time synchronization when operating at 792000

Re: imx6ull cpu frequency failed using 1588 time synchronization when operating at 792000

Re: imx6ull cpu frequency failed using 1588 time synchronization when operating at 792000