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[media] rtl2832_sdr: enhance sample rate debug calculation precision 

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 23:44:13 -03:00 committed by Mauro Carvalho Chehab
parent abfc8d66d7
commit b538a8e85b
1 changed files with 7 additions and 5 deletions
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12
drivers/media/dvb-frontends/rtl2832_sdr.c
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@ -365,17 +365,19 @@ static unsigned int rtl2832_sdr_convert_stream(struct rtl2832_sdr_state *s,
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))) {
#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;
s->jiffies_next = jiffies + msecs_to_jiffies(MSECS);
s->sample_measured = s->sample;
dev_dbg(&s->udev->dev,
"slen=%d samples=%u msecs=%lu sampling rate=%lu\n",
src_len, samples, MSECS,
samples * 1000UL / MSECS);
"slen=%u samples=%u msecs=%u sample rate=%lu\n",
src_len, samples, msecs,
samples * 1000UL / msecs);
}
/* total number of I+Q pairs */