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| author | Reinhard Nißl <rnissl@gmx.de> | 2013-06-02 14:59:00 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-06-08 20:14:17 -0300 |
| commit | 0c1d2b14d09b862ccd6300d774eb579161635710 (patch) | |
| tree | ca80497dfd440f79d65a9a5c45e5d744f82ee581 | |
| parent | 55b3318b3a49488a14ccfceffde668d548c4e427 (diff) | |
| download | lwn-0c1d2b14d09b862ccd6300d774eb579161635710.tar.gz lwn-0c1d2b14d09b862ccd6300d774eb579161635710.zip | |
[media] stb0899: store successful inversion for next run
Usually, inversion doesn't change in a system. Storing the last
successful inversion value speeds up tuning of DVB-S2 transponders.
Signed-off-by: Reinhard Nißl <rnissl@gmx.de>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/dvb-frontends/stb0899_algo.c | 8 | ||||
| -rw-r--r-- | drivers/media/dvb-frontends/stb0899_drv.c | 5 |
2 files changed, 9 insertions, 4 deletions
diff --git a/drivers/media/dvb-frontends/stb0899_algo.c b/drivers/media/dvb-frontends/stb0899_algo.c index e0d31a2ea578..4b49efb67931 100644 --- a/drivers/media/dvb-frontends/stb0899_algo.c +++ b/drivers/media/dvb-frontends/stb0899_algo.c @@ -1488,9 +1488,15 @@ enum stb0899_status stb0899_dvbs2_algo(struct stb0899_state *state) offsetfreq = offsetfreq / ((1 << 30) / 1000); offsetfreq *= (internal->master_clk / 1000000); + + /* store current inversion for next run */ reg = STB0899_READ_S2REG(STB0899_S2DEMOD, DMD_CNTRL2); if (STB0899_GETFIELD(SPECTRUM_INVERT, reg)) - offsetfreq *= -1; + internal->inversion = IQ_SWAP_ON; + else + internal->inversion = IQ_SWAP_OFF; + + offsetfreq *= internal->inversion; internal->freq = internal->freq - offsetfreq; internal->srate = stb0899_dvbs2_get_srate(state); diff --git a/drivers/media/dvb-frontends/stb0899_drv.c b/drivers/media/dvb-frontends/stb0899_drv.c index b3ccd3dbbda1..82391feb6839 100644 --- a/drivers/media/dvb-frontends/stb0899_drv.c +++ b/drivers/media/dvb-frontends/stb0899_drv.c @@ -1618,19 +1618,18 @@ static struct dvb_frontend_ops stb0899_ops = { struct dvb_frontend *stb0899_attach(struct stb0899_config *config, struct i2c_adapter *i2c) { struct stb0899_state *state = NULL; - enum stb0899_inversion inversion; state = kzalloc(sizeof (struct stb0899_state), GFP_KERNEL); if (state == NULL) goto error; - inversion = config->inversion; state->verbose = &verbose; state->config = config; state->i2c = i2c; state->frontend.ops = stb0899_ops; state->frontend.demodulator_priv = state; - state->internal.inversion = inversion; + /* use configured inversion as default -- we'll later autodetect inversion */ + state->internal.inversion = config->inversion; stb0899_wakeup(&state->frontend); if (stb0899_get_dev_id(state) == -ENODEV) { |