[media] airspy: 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/usb/airspy/airspy.c b/drivers/media/usb/airspy/airspy.c
index 994c9914ab9b37a5a300e40e694f3d66d9f60bba..4069234abed5432c7fbf2f867da9c0235d4eba37 100644 (file)
--- a/drivers/media/usb/airspy/airspy.c
+++ b/drivers/media/usb/airspy/airspy.c
@@ -250,16 +250,18 @@ static unsigned int airspy_convert_stream(struct airspy *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
+               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->dev, "slen=%d samples=%u msecs=%lu sample rate=%lu\n",
-                               src_len, samples, MSECS,
-                               samples * 1000UL / MSECS);
+               dev_dbg(s->dev, "slen=%u samples=%u msecs=%u sample rate=%lu\n",
+                               src_len, samples, msecs,
+                               samples * 1000UL / msecs);
        }
 
        /* total number of samples */