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[media] stb0899: use sign_extend32() for sign extension

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Instead of implement its own logic, use the already-defined one.

Signed-off-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Martin Kepplinger 2015-01-25 11:51:35 -03:00 committed by Mauro Carvalho Chehab
parent 17d4d6ae09
commit 2948c01c2b
1 changed files with 2 additions and 3 deletions
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5
drivers/media/dvb-frontends/stb0899_algo.c
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@ -19,6 +19,7 @@
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/ */
#include <linux/bitops.h>
#include "stb0899_drv.h" #include "stb0899_drv.h"
#include "stb0899_priv.h" #include "stb0899_priv.h"
#include "stb0899_reg.h" #include "stb0899_reg.h"
@ -1490,9 +1491,7 @@ enum stb0899_status stb0899_dvbs2_algo(struct stb0899_state *state)
/* Store signal parameters */ /* Store signal parameters */
offsetfreq = STB0899_READ_S2REG(STB0899_S2DEMOD, CRL_FREQ); offsetfreq = STB0899_READ_S2REG(STB0899_S2DEMOD, CRL_FREQ);
/* sign extend 30 bit value before using it in calculations */ offsetfreq = sign_extend32(offsetfreq, 29);
if (offsetfreq & (1 << 29))
offsetfreq |= -1 << 30;
offsetfreq = offsetfreq / ((1 << 30) / 1000); offsetfreq = offsetfreq / ((1 << 30) / 1000);
offsetfreq *= (internal->master_clk / 1000000); offsetfreq *= (internal->master_clk / 1000000);