Commit d98c0285 authored by Manu Abraham's avatar Manu Abraham Committed by Mauro Carvalho Chehab
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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: default avatarManu Abraham <manu@linuxtv.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 421b2970

drivers/media/dvb/frontends/stb0899_drv.c

+4 −4
Original line number Diff line number Diff line
@@ -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);