V4L/DVB (9407): Optimizations Reduce capture range from 10MHz to 3Mhz
* Reduces szapping time a lot
* increased stability at Low Symbol rates
* overall increases reliability in tuning
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/frontends/stb0899_drv.c b/drivers/media/dvb/frontends/stb0899_drv.c
index ce1016e..67f6edf 100644
--- a/drivers/media/dvb/frontends/stb0899_drv.c
+++ b/drivers/media/dvb/frontends/stb0899_drv.c
@@ -1481,8 +1481,8 @@
}
dprintk(verbose, FE_DEBUG, 1, "delivery system=%d", state->delsys);
-// SearchRange = 3000000; /* Search Bandwidth (3 Mhz, was initially 10 Mhz) */
- SearchRange = 10000000; /* Search Bandwidth (3 Mhz, was initially 10 Mhz) */
+ SearchRange = 3000000; /* Search Bandwidth (3 Mhz, was initially 10 Mhz) */
+// SearchRange = 10000000; /* Search Bandwidth (3 Mhz, was initially 10 Mhz) */
dprintk(verbose, FE_DEBUG, 1, "Frequency=%d, Srate=%d", i_params->freq, i_params->srate);
/* checking Search Range is meaningless for a fixed 3 Mhz */
if (INRANGE(i_params->srate, 1000000, 45000000)) {
@@ -1521,7 +1521,7 @@
/* What to do for tuners having no bandwidth setup ? */
if (state->config->tuner_set_bandwidth)
- state->config->tuner_set_bandwidth(fe, (13 * (stb0899_carr_width(state) + 10000000)) / 10);
+ state->config->tuner_set_bandwidth(fe, (135 * (stb0899_carr_width(state) + SearchRange)) / 100);
if (state->config->tuner_get_bandwidth)
state->config->tuner_get_bandwidth(fe, &internal->tuner_bw);
/* Set DVB-S1 AGC */
@@ -1553,7 +1553,7 @@
internal->srch_range = SearchRange;
if (state->config->tuner_set_bandwidth)
- state->config->tuner_set_bandwidth(fe, (stb0899_carr_width(state) + 10000000));
+ state->config->tuner_set_bandwidth(fe, (135 * (stb0899_carr_width(state) + SearchRange)) / 100);
if (state->config->tuner_get_bandwidth)
state->config->tuner_get_bandwidth(fe, &internal->tuner_bw);