[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>
diff --git a/drivers/media/dvb-frontends/stb0899_algo.c b/drivers/media/dvb-frontends/stb0899_algo.c
index e0d31a2..4b49efb 100644
--- a/drivers/media/dvb-frontends/stb0899_algo.c
+++ b/drivers/media/dvb-frontends/stb0899_algo.c
@@ -1488,9 +1488,15 @@
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);