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| author | Manu Abraham <abraham.manu@gmail.com> | 2008-02-03 19:37:02 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-12-29 17:53:23 -0200 |
| commit | 40e8ce3dba8e9437ed48c88c268615dc0a4bebb2 (patch) | |
| tree | b5588068dfd4ff2e7a16c420f98110a5be6ce711 /drivers/media/dvb/frontends/stb0899_algo.c | |
| parent | ed3d150eacfa87087f705a908a2586bdec5bf9b7 (diff) | |
| download | lwn-40e8ce3dba8e9437ed48c88c268615dc0a4bebb2.tar.gz lwn-40e8ce3dba8e9437ed48c88c268615dc0a4bebb2.zip | |
V4L/DVB (9457): Optimization, Fix a Bug
* cut down some I/O operations by disabling "disable gate"
* budget_av was left with the gate open, thereby more susceptible
to RF interference due to I/O operations
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/frontends/stb0899_algo.c')
| -rw-r--r-- | drivers/media/dvb/frontends/stb0899_algo.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/stb0899_algo.c b/drivers/media/dvb/frontends/stb0899_algo.c index b7752473f7a7..3cf9719204f2 100644 --- a/drivers/media/dvb/frontends/stb0899_algo.c +++ b/drivers/media/dvb/frontends/stb0899_algo.c @@ -583,6 +583,9 @@ enum stb0899_status stb0899_dvbs_algo(struct stb0899_state *state) internal->derot_freq = 0; internal->status = NOAGC1; + /* enable tuner I/O */ + stb0899_i2c_gate_ctrl(&state->frontend, 1); + /* Move tuner to frequency */ dprintk(state->verbose, FE_DEBUG, 1, "Tuner set frequency"); if (state->config->tuner_set_frequency) @@ -598,6 +601,10 @@ enum stb0899_status stb0899_dvbs_algo(struct stb0899_state *state) /* There is signal in the band */ if (config->tuner_get_bandwidth) config->tuner_get_bandwidth(&state->frontend, &bandwidth); + + /* disable tuner I/O */ + stb0899_i2c_gate_ctrl(&state->frontend, 0); + if (params->srate <= bandwidth / 2) stb0899_search_tmg(state); /* For low rates (SCPC) */ else @@ -1325,12 +1332,18 @@ enum stb0899_status stb0899_dvbs2_algo(struct stb0899_state *state) STB0899_SETFIELD_VAL(FRESRS, reg, 1); stb0899_write_reg(state, STB0899_TSTRES, reg); + /* enable tuner I/O */ + stb0899_i2c_gate_ctrl(&state->frontend, 1); + /* Move tuner to frequency */ if (state->config->tuner_set_frequency) state->config->tuner_set_frequency(&state->frontend, internal->freq); if (state->config->tuner_get_frequency) state->config->tuner_get_frequency(&state->frontend, &internal->freq); + /* disable tuner I/O */ + stb0899_i2c_gate_ctrl(&state->frontend, 0); + /* Set IF AGC to acquisition */ reg = STB0899_READ_S2REG(STB0899_S2DEMOD, IF_AGC_CNTRL); STB0899_SETFIELD_VAL(IF_LOOP_GAIN, reg, 4); |