ptp: ocp: fix PCIe delay estimation calculation

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The commit in fixes introduced a high cap for delayas U64_MAX value
while ktime_t is actually s64. This is wrong cap as it becomes negative
value and any comparison to a real delay will fail to update delay
value. Use KTIME_MAX constant as correct max cap for PCIe delay.

The issue was hit in production (a negative value is observed):

  # cat /sys/class/timecard/ocp0/ts_window_adjust
  -3

Fixes: aa05fe67bc ("ptp: ocp: Improve PCIe delay estimation")
Signed-off-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://patch.msgid.link/20261007203359.417270-1-vadim.fedorenko@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Vadim Fedorenko 2026-10-07 20:33:59 +00:00 • committed by Jakub Kicinski

parent 93ccaf1c26

commit f8c8bd159a

1 changed files with 1 additions and 1 deletions

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drivers/ptp/ptp_ocp.c

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