From 0dbfe020ad585c8ec4673e9b9812353a4b591fd0 Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Fri, 16 Jun 2017 13:39:01 +0200
Subject: [PATCH] refclock: set default precision to precision of system clock

---
 doc/chrony.conf.adoc | 5 ++---
 refclock.c           | 8 ++------
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/doc/chrony.conf.adoc b/doc/chrony.conf.adoc
index 9a20e561..c9cd9a40 100644
--- a/doc/chrony.conf.adoc
+++ b/doc/chrony.conf.adoc
@@ -505,9 +505,8 @@ algorithm. Increasing the delay is useful to avoid having no majority in the
 source selection or to make it prefer other sources. The default is 1e-9 (1
 nanosecond).
 *precision* _precision_:::
-This option sets the refclock precision (in seconds). The default is 1e-6 (1
-microsecond) for SHM refclock, and 1e-9 (1 nanosecond) for SOCK, PPS and PHC
-refclocks.
+This option sets the precision of the reference clock (in seconds). The default
+value is the estimated precision of the system clock.
 *maxdispersion* _dispersion_:::
 Maximum allowed dispersion for filtered samples (in seconds). Samples with
 larger estimated dispersion are ignored. By default, this limit is disabled.
diff --git a/refclock.c b/refclock.c
index e89b4851..6959e5b8 100644
--- a/refclock.c
+++ b/refclock.c
@@ -173,16 +173,12 @@ RCL_AddRefclock(RefclockParameters *params)
 
   if (strcmp(params->driver_name, "SHM") == 0) {
     inst->driver = &RCL_SHM_driver;
-    inst->precision = 1e-6;
   } else if (strcmp(params->driver_name, "SOCK") == 0) {
     inst->driver = &RCL_SOCK_driver;
-    inst->precision = 1e-9;
   } else if (strcmp(params->driver_name, "PPS") == 0) {
     inst->driver = &RCL_PPS_driver;
-    inst->precision = 1e-9;
   } else if (strcmp(params->driver_name, "PHC") == 0) {
     inst->driver = &RCL_PHC_driver;
-    inst->precision = 1e-9;
   } else {
     LOG_FATAL("unknown refclock driver %s", params->driver_name);
     return 0;
@@ -207,8 +203,8 @@ RCL_AddRefclock(RefclockParameters *params)
   inst->lock_ref = params->lock_ref_id;
   inst->offset = params->offset;
   inst->delay = params->delay;
-  if (params->precision > 0.0)
-    inst->precision = params->precision;
+  inst->precision = LCL_GetSysPrecisionAsQuantum();
+  inst->precision = MAX(inst->precision, params->precision);
   inst->pulse_width = params->pulse_width;
   inst->timeout_id = -1;
   inst->source = NULL;
-- 
2.47.3