diff options
| author | Reinhard Nißl <rnissl@gmx.de> | 2013-06-02 21:37:06 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-06-09 03:11:49 +0400 |
| commit | ccac68f9818d0ff5c4cde26590a7f284285c724e (patch) | |
| tree | 565b25f698fe86305b3cf58c096722b6a8167b08 /drivers/media | |
| parent | 703e60655ca520c5380d8c83a9db0d5e9b906856 (diff) | |
| download | linux-ccac68f9818d0ff5c4cde26590a7f284285c724e.tar.xz | |
[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 <rnissl@gmx.de>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/dvb-frontends/stb0899_algo.c | 4 |
1 files changed, 4 insertions, 0 deletions
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); |