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[media] drxk: fix CNR calculus 

Changeset 8f3741e accidentally broke the CNR estimation. It should
be calculated as "a + b - c". However, previously, the subtraction
by c only occurred if SNR would be positive, due to a bad binding
to DVBv3 API.

This also fixes the following warning:
	drivers/media/dvb-frontends/drxk_hard.c:2556:6: warning: variable 'c' set but not used [-Wunused-but-set-variable]

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2013-03-22 06:37:32 -03:00
parent f35d09db0e
commit 48f72a1a4c
1 changed files with 1 additions and 1 deletions
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2
drivers/media/dvb-frontends/drxk_hard.c
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@ -2628,7 +2628,7 @@ static int GetDVBTSignalToNoise(struct drxk_state *state,
/* log(x) x = (16bits + 16bits) << 15 ->32 bits */
c = Log10Times100(SqrErrIQ);
iMER = a + b;
iMER = a + b - c;
}
*pSignalToNoise = iMER;