From: Antti Palosaari Date: Sun, 24 Aug 2014 23:11:27 +0000 (-0300) Subject: [media] airspy: enhance sample rate debug calculation precision X-Git-Tag: firefly_0821_release~176^2~2474^2~617 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b8843c7979fc8ea54efeaef8e9d524c33c42f099;p=firefly-linux-kernel-4.4.55.git [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 Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/usb/airspy/airspy.c b/drivers/media/usb/airspy/airspy.c index 994c9914ab9b..4069234abed5 100644 --- 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 */