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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_drv.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_drv.c')
| -rw-r--r-- | drivers/media/dvb/frontends/stb0899_drv.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/media/dvb/frontends/stb0899_drv.c b/drivers/media/dvb/frontends/stb0899_drv.c index 196a837f11ce..333b983b04ab 100644 --- a/drivers/media/dvb/frontends/stb0899_drv.c +++ b/drivers/media/dvb/frontends/stb0899_drv.c @@ -1241,7 +1241,7 @@ static int stb0899_set_tone(struct dvb_frontend *fe, fe_sec_tone_mode_t tone) return 0; } -static int stb0899_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) +int stb0899_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) { int i2c_stat; struct stb0899_state *state = fe->demodulator_priv; @@ -1255,10 +1255,15 @@ static int stb0899_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) i2c_stat |= STB0899_I2CTON; if (stb0899_write_reg(state, STB0899_I2CRPT, i2c_stat) < 0) goto err; + } else { + dprintk(state->verbose, FE_DEBUG, 1, "Disabling I2C Repeater ..."); + i2c_stat &= ~STB0899_I2CTON; + if (stb0899_write_reg(state, STB0899_I2CRPT, i2c_stat) < 0) + goto err; } return 0; err: - dprintk(state->verbose, FE_ERROR, 1, "I2C Repeater enable failed"); + dprintk(state->verbose, FE_ERROR, 1, "I2C Repeater control failed"); return -EREMOTEIO; } @@ -1592,10 +1597,17 @@ static enum dvbfe_search stb0899_search(struct dvb_frontend *fe, struct dvbfe_pa internal->derot_percent = 30; /* What to do for tuners having no bandwidth setup ? */ + /* enable tuner I/O */ + stb0899_i2c_gate_ctrl(&state->frontend, 1); + if (state->config->tuner_set_bandwidth) state->config->tuner_set_bandwidth(fe, (13 * (stb0899_carr_width(state) + SearchRange)) / 10); if (state->config->tuner_get_bandwidth) state->config->tuner_get_bandwidth(fe, &internal->tuner_bw); + + /* disable tuner I/O */ + stb0899_i2c_gate_ctrl(&state->frontend, 0); + /* Set DVB-S1 AGC */ stb0899_write_reg(state, STB0899_AGCRFCFG, 0x11); @@ -1624,11 +1636,17 @@ static enum dvbfe_search stb0899_search(struct dvb_frontend *fe, struct dvbfe_pa internal->srate = i_params->srate; internal->srch_range = SearchRange; + /* enable tuner I/O */ + stb0899_i2c_gate_ctrl(&state->frontend, 1); + if (state->config->tuner_set_bandwidth) state->config->tuner_set_bandwidth(fe, (stb0899_carr_width(state) + SearchRange)); if (state->config->tuner_get_bandwidth) state->config->tuner_get_bandwidth(fe, &internal->tuner_bw); + /* disable tuner I/O */ + stb0899_i2c_gate_ctrl(&state->frontend, 0); + // pParams->SpectralInv = pSearch->IQ_Inversion; /* Set DVB-S2 AGC */ |