Unable to achieve PPS with Jetpack 5.0.2

[mhtechdev]

Using 419 didn´t work at all for some reason, with pps not showing up in /sys/kernel/debug/gpio at all.

But I managed to get to the following now:

[ 334.111412] pps pps1: PPS_GETPARAMS
[ 334.111447] pps pps1: PPS_GETCAP
[ 334.111458] pps pps1: PPS_GETPARAMS
[ 334.111469] pps pps1: PPS_SETPARAMS
[ 334.111477] pps pps1: time format unspecified (11)
[ 334.111607] pps pps1: PPS_FETCH
[ 334.111617] pps pps1: timeout 3.000000000
[ 337.115582] pps_core: Error in cdev_pps_fetch: ETIMEDOUT
[ 337.115593] pps_core: pps Error in PPS_FETCH: -110
[ 337.116061] pps pps1: PPS_FETCH
[ 337.116071] pps pps1: timeout 3.000000000
[ 340.187534] pps_core: Error in cdev_pps_fetch: ETIMEDOUT
[ 340.187544] pps_core: pps Error in PPS_FETCH: -110
[ 340.187988] pps pps1: PPS_FETCH
[ 340.187998] pps pps1: timeout 3.000000000
[ 340.195238] pps_core: Error in cdev_pps_fetch: -ERESTARTSYS
[ 340.195248] pps pps1: pending signal caught
[ 340.195408] pps_core: pps Error in PPS_FETCH: -4

with the following debug prints in pps.c:

case PPS_FETCH: {
…
err = copy_from_user(&fdata, uarg, sizeof(struct pps_fdata));
if (err) {
pr_err(“-EFAULT in PPS_FETCH pps\n”);
return -EFAULT;
}
err = pps_cdev_pps_fetch(pps, &fdata);
if (err) {
pr_err(“pps Error in PPS_FETCH: %d\n”, err);
return err;
}

[JerryChang]

hello mhtechdev,

if there was any error the IOCTL sequence/call would have failed…
you may check if interrupt count is increasing, please check the irq interrupt of pps pin, the interrupt counter should increase by one for every second.

[mhtechdev]

Yes, the interrupt count for pps1 in /proc/interrupts counts up, and stops increasing when I disconnect the physical PPS wire. So the GPIO config is fine I guess? Why doesn´t it get through to the PPS driver?

[JerryChang]

as I mentioned in comment #15, this is a generic linux driver, please debug into it.

[mhtechdev]

According to Using pps-gpio on Orin - #3 by JerryChang the issue is known and you are looking into it? I haven´t been able to get further, so any further help is appreciated.

[JerryChang]

no, conclusion is mentioned here… Jetpack 5.0.2: UART: CTS pin not working - #15 by JerryChang