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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);