V4L/DVB (7731): tuner-xc2028: fix signal strength calculus
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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@ -844,21 +844,28 @@ static int xc2028_signal(struct dvb_frontend *fe, u16 *strength)
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/* Sync Lock Indicator */
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rc = xc2028_get_reg(priv, 0x0002, &frq_lock);
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if (rc < 0 || frq_lock == 0)
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if (rc < 0)
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goto ret;
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/* Frequency is locked. Return signal quality */
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/* Frequency is locked */
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if (frq_lock == 1)
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signal = 32768;
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/* Get SNR of the video signal */
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rc = xc2028_get_reg(priv, 0x0040, &signal);
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if (rc < 0)
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signal = -frq_lock;
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goto ret;
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/* Use both frq_lock and signal to generate the result */
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signal = signal || ((signal & 0x07) << 12);
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ret:
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mutex_unlock(&priv->lock);
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*strength = signal;
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tuner_dbg("signal strength is %d\n", signal);
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return rc;
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}
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