V4L/DVB (9447): stb6100: improve rounding

Optimization: Round the requested value to achieve a
+/-1MHz error instead of +0/-2MHz

Signed-off-by: Reinhard Nissl <rnissl@gmx.de>
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/frontends/stb6100.c b/drivers/media/dvb/frontends/stb6100.c
index 0259a46..5c6d067 100644 (file)
--- a/drivers/media/dvb/frontends/stb6100.c
+++ b/drivers/media/dvb/frontends/stb6100.c
@@ -276,7 +276,7 @@ static int stb6100_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
        else if (bandwidth <= 5000000)  /* bw/2 min = 5Mhz for F=0                      */
                tmp = 0;
        else                            /* if 5 < bw/2 < 36                             */
-               tmp = bandwidth / 1000000 - 5;
+               tmp = (bandwidth + 500000) / 1000000 - 5;
 
        /* Turn on LPF bandwidth setting clock control,
         * set bandwidth, wait 10ms, turn off.