ptp: ocp: Add ptp_ocp_adjtime_coarse for large adjustments
In ("ptp: ocp: Have FPGA fold in ns adjustment for adjtime."), the ns adjustment was written to the FPGA register, so the clock could accurately perform adjustments. However, the adjtime() call passes in a s64, while the clock adjustment registers use a s32. When trying to perform adjustments with a large value (37 sec), things fail. Examine the incoming delta, and if larger than 1 sec, use the original (coarse) adjustment method. If smaller than 1 sec, then allow the FPGA to fold in the changes over a 1 second window. Fixes: 6d59d4fa ("ptp: ocp: Have FPGA fold in ns adjustment for adjtime.") Signed-off-by:Jonathan Lemon <jonathan.lemon@gmail.com> Acked-by:
Richard Cochran <richardcochran@gmail.com> Link: https://lore.kernel.org/r/20220228203957.367371-1-jonathan.lemon@gmail.com Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
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