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[media] stb0899: store successful inversion for next run

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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>
This commit is contained in:
Reinhard Nißl 2013-06-02 14:59:00 -03:00 committed by Mauro Carvalho Chehab
parent 55b3318b3a
commit 0c1d2b14d0
2 changed files with 9 additions and 4 deletions
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8
drivers/media/dvb-frontends/stb0899_algo.c
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@ -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);

5
drivers/media/dvb-frontends/stb0899_drv.c
View file

@ -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) {