> -----Original Message-----
> From: Richard Cochran [mailto:richardcoch...@gmail.com]
> Sent: Saturday, April 08, 2017 12:21 PM
> To: linuxptp-devel@lists.sourceforge.net
> Subject: [Linuxptp-devel] [PATCH 1/3] tsproc: Track the validity of the
> filtered
> delay explicitly.
>
> We will want to test whether a valid filtered delay value has been
> calculated or not. However, we cannot simply test for zero since that is
> a legitimate possible delay value. This patch adds a flag that reflects
> the state of the filtered delay field.
>
> Signed-off-by: Richard Cochran <richardcoch...@gmail.com>
Makes sense.
Thanks,
Jake
> ---
> tsproc.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/tsproc.c b/tsproc.c
> index cf5f0dc..1eb24a1 100644
> --- a/tsproc.c
> +++ b/tsproc.c
> @@ -42,6 +42,7 @@ struct tsproc {
>
> /* Current filtered delay */
> tmv_t filtered_delay;
> + int filtered_delay_valid;
>
> /* Delay filter */
> struct filter *delay_filter;
> @@ -115,6 +116,7 @@ void tsproc_set_clock_rate_ratio(struct tsproc *tsp,
> double clock_rate_ratio)
> void tsproc_set_delay(struct tsproc *tsp, tmv_t delay)
> {
> tsp->filtered_delay = delay;
> + tsp->filtered_delay_valid = 1;
> }
>
> tmv_t get_raw_delay(struct tsproc *tsp)
> @@ -149,6 +151,7 @@ int tsproc_update_delay(struct tsproc *tsp, tmv_t *delay)
>
> raw_delay = get_raw_delay(tsp);
> tsp->filtered_delay = filter_sample(tsp->delay_filter, raw_delay);
> + tsp->filtered_delay_valid = 1;
>
> pr_debug("delay filtered %10" PRId64 " raw %10" PRId64,
> tsp->filtered_delay, raw_delay);
> @@ -199,5 +202,6 @@ void tsproc_reset(struct tsproc *tsp, int full)
> if (full) {
> tsp->clock_rate_ratio = 1.0;
> filter_reset(tsp->delay_filter);
> + tsp->filtered_delay_valid = 0;
> }
> }
> --
> 2.1.4
>
>
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