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[media] airspy: enhance sample rate debug calculation precision

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Sample rate calculation gives a little bit too large results because
in real life there was around one milliseconds (~one usb packet) too
much data for given time. Calculate time more accurate in order to
provide better results.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2014-08-24 20:11:27 -03:00 • committed by Mauro Carvalho Chehab
commit b8843c7979
1 changed files with 6 additions and 4 deletions
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10
drivers/media/usb/airspy/airspy.c
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@ -250,16 +250,18 @@ static unsigned int airspy_convert_stream(struct airspy *s,
dst_len = 0; dst_len = 0;
} }
/* calculate samping rate and output it in 10 seconds intervals */ /* calculate sample rate and output it in 10 seconds intervals */
if (unlikely(time_is_before_jiffies(s->jiffies_next))) { if (unlikely(time_is_before_jiffies(s->jiffies_next))) {
#define MSECS 10000UL #define MSECS 10000UL
unsigned int msecs = jiffies_to_msecs(jiffies -
s->jiffies_next + msecs_to_jiffies(MSECS));
unsigned int samples = s->sample - s->sample_measured; unsigned int samples = s->sample - s->sample_measured;
s->jiffies_next = jiffies + msecs_to_jiffies(MSECS); s->jiffies_next = jiffies + msecs_to_jiffies(MSECS);
s->sample_measured = s->sample; s->sample_measured = s->sample;
dev_dbg(s->dev, "slen=%d samples=%u msecs=%lu sample rate=%lu\n", dev_dbg(s->dev, "slen=%u samples=%u msecs=%u sample rate=%lu\n",
src_len, samples, MSECS, src_len, samples, msecs,
samples * 1000UL / MSECS); samples * 1000UL / msecs);
} }
/* total number of samples */ /* total number of samples */