[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>
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@ -2628,7 +2628,7 @@ static int GetDVBTSignalToNoise(struct drxk_state *state,
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/* log(x) x = (16bits + 16bits) << 15 ->32 bits */
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c = Log10Times100(SqrErrIQ);
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iMER = a + b;
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iMER = a + b - c;
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}
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*pSignalToNoise = iMER;
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