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authorManu Abraham <abraham.manu@gmail.com>2007-09-26 18:32:13 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2008-12-29 17:53:17 -0200
commitd98c02859fbeefe19e6b182997c6a8b3c9c32acc (patch)
tree08036e298eb362a52cee34c43a983934a9fc3421 /drivers/media
parent421b2970d24f7571039b29e6726bce1608578ac4 (diff)
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>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/dvb/frontends/stb0899_drv.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/media/dvb/frontends/stb0899_drv.c b/drivers/media/dvb/frontends/stb0899_drv.c
index ce1016eed80..67f6edfa7e5 100644
--- a/drivers/media/dvb/frontends/stb0899_drv.c
+++ b/drivers/media/dvb/frontends/stb0899_drv.c
@@ -1481,8 +1481,8 @@ static enum dvbfe_search stb0899_search(struct dvb_frontend *fe, struct dvbfe_pa
}
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 @@ static enum dvbfe_search stb0899_search(struct dvb_frontend *fe, struct dvbfe_pa
/* 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 @@ static enum dvbfe_search stb0899_search(struct dvb_frontend *fe, struct dvbfe_pa
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);