From: Reinhard Nißl Date: Sun, 2 Jun 2013 17:37:06 +0000 (-0300) Subject: [media] stb0899: sign extend raw CRL_FREQ value X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ccac68f9818d0ff5c4cde26590a7f284285c724e;p=linux-beck.git [media] stb0899: sign extend raw CRL_FREQ value 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 Signed-off-by: Michael Krufky Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/dvb-frontends/stb0899_algo.c b/drivers/media/dvb-frontends/stb0899_algo.c index 117a56926dca..bd9dbd70af0f 100644 --- a/drivers/media/dvb-frontends/stb0899_algo.c +++ b/drivers/media/dvb-frontends/stb0899_algo.c @@ -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);