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[media] stb0899: sign extend raw CRL_FREQ value

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Contrary to the chip's specs, the register's value is signed, so we
need to sign extend the value before using it in calculations like
when determining the offset frequency.

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 14:37:06 -03:00 committed by Mauro Carvalho Chehab
parent 703e60655c
commit ccac68f981
1 changed files with 4 additions and 0 deletions
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4
drivers/media/dvb-frontends/stb0899_algo.c
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@ -1487,6 +1487,10 @@ enum stb0899_status stb0899_dvbs2_algo(struct stb0899_state *state)
/* Store signal parameters */
offsetfreq = STB0899_READ_S2REG(STB0899_S2DEMOD, CRL_FREQ);
/* sign extend 30 bit value before using it in calculations */
if (offsetfreq & (1 << 29))
offsetfreq |= -1 << 30;
offsetfreq = offsetfreq / ((1 << 30) / 1000);
offsetfreq *= (internal->master_clk / 1000000);
reg = STB0899_READ_S2REG(STB0899_S2DEMOD, DMD_CNTRL2);