[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>

diff --git a/drivers/media/dvb-frontends/rtl2832_sdr.c b/drivers/media/dvb-frontends/rtl2832_sdr.c
index 029189d..9211dde 100644 (file)
--- a/drivers/media/dvb-frontends/rtl2832_sdr.c
+++ b/drivers/media/dvb-frontends/rtl2832_sdr.c
@@ -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 */