diff options
| author | Bryan O'Donoghue <bryan.odonoghue@linaro.org> | 2015-08-17 00:55:05 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@google.com> | 2015-08-18 09:45:23 -0700 |
| commit | bd416103b204494e29b095e28c5a7b6a77e8f2b9 (patch) | |
| tree | 5afdd9ea5760f394d523a1eefe98ef10e6f8bcab /drivers | |
| parent | 67d1eeceb1aab4a192a0f132cd230d41932ba91e (diff) | |
greybus: loopback: add gb_loopback_nsec_to_usec_latency
A helper function to convert from a nanosecond value to a latency value
expressed in mircoseconds. This will be used again in subsequent patches.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/greybus/loopback.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c index b46ded22b533..4879edda982a 100644 --- a/drivers/staging/greybus/loopback.c +++ b/drivers/staging/greybus/loopback.c @@ -283,6 +283,15 @@ static struct attribute *loopback_attrs[] = { }; ATTRIBUTE_GROUPS(loopback); +static u32 gb_loopback_nsec_to_usec_latency(u64 elapsed_nsecs) +{ + u32 lat; + + do_div(elapsed_nsecs, NSEC_PER_USEC); + lat = elapsed_nsecs; + return lat; +} + static u64 gb_loopback_calc_latency(struct timeval *ts, struct timeval *te) { u64 t1, t2; @@ -532,9 +541,7 @@ static void gb_loopback_calculate_stats(struct gb_loopback *gb) u64 tmp; /* Express latency in terms of microseconds */ - tmp = gb->elapsed_nsecs; - do_div(tmp, NSEC_PER_USEC); - lat = tmp; + lat = gb_loopback_nsec_to_usec_latency(gb->elapsed_nsecs); /* Log latency statistic */ gb_loopback_update_stats(&gb_dev.latency, lat); |