In the PPS loop, instead of setting the system clock from the PHC only
once on start, read PHC with each PPS sample and use the time stamp to
get the whole number of seconds in the offset. This will prevent phc2sys
from losing track of the system clock.
Also, check if the PPS is synchronized to the PHC.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
With non-PPS loops let the servo make the inital correction. Move the
code to the PPS loop and change it to use the sample filtering to reduce
the error in the initial correction.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Instead of always starting at zero frequency offset, read the currently
stored value on start and pass it to the servo. As the read may silently
fail and return zero, set the clock frequency back to the read value to
make sure it's always equal to the actual frequency of the clock.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
We use the PTP_SYS_OFFSET ioctl method in preference to doing
clock_gettime from user space, the assumption being that the kernel space
measurement will always be more accurate.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
this patch changes sk_interface_phc to sk_get_ts_info, by allowing the function
to store all the data returned by Ethtool's get_ts_info IOCTL in a struct. A new
struct "sk_ts_info" contains the same data as well as a field for specifying the
structure as valid (in order to support old kernels without the IOCTL). The
valid field should be set only when the IOCTL successfully populates the fields.
A follow-on patch will add new functionality possible because of these
changes. This patch only updates the programs which use the call to perform the
minimum they already do, using the new interface.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
This patch adds support for sk_interface_phc to lookup the /dev/ptpX device
using ethtool's get_ts_info ioctl
-v2-
* set ethdev to null initially
* rebased on top of phc2sys changes
-v3-
* fixed typo regarding slash
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
The main loop has become a bit messy, mixing two completely disjunct code
paths. This patch separates the two use cases for the sake of clarity.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
As some PHC hardware/drivers don't provide PPS, it may be useful to keep the
system clock synchronized to PHC via clock_gettime(). While the precision
of the clock is only in microsecond range, the error seems to be quite stable.
The -d parameter now can be omitted if -s is provided.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
As some PHC hardware/drivers don't provide PPS, it may be useful to keep the
system clock synchronized to PHC via clock_gettime(). While the precision
of the clock is only in microsecond range, the error seems to be quite stable.
The -d parameter now can be omitted if -s is provided.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Miroslav Lichvar
Richard Cochran
Jacob Keller