Current pi servo steps clock without any condition on start.
This patch adds a new servo option "configured_pi_f_offset". The option is similar
to configured_pi_offset but only affects in the first clock update. Therefore,
if this option is set as 0.0, we can prevent clock step on start.
The new servo option can be specified from phc2sys by using -F option.
This feature is usefull when we need to restart phc2sys without system
clock jump. Restarting phc2sys is needed to change its configuration.
changes since v2:
- manual page fix.
- also apply max_offset along with max_f_offset in servo step1.
- add a variable to check if first update is done.
changes since v1:(http://sourceforge.net/mailarchive/message.php?msg_id=31039874)
- remake as a new servo option.
Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com>
The option sets an additional limit to the hardware limit. It's disabled
if set to zero. The default is 900000000 ppb.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
this patch modifies the pi servo to add a configurable max offset (default
infinity). When ever the detected offset is larger than this value, the clock
will jump and reset the servo state. The value of this feature is for decreasing
time to stabalize when clock is off by a large ammount during late running. This
can occur when the upstream master changes, or when the clock is reset due to
outside forces. The method used to reset clock is simply to reset the pi servo
to the unlocked state.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
If software time stamping is to be used, then the servo will want to
have appropriate filtering.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Ken ICHIKAWA
Miroslav Lichvar
Jacob Keller
Richard Cochran