Commit b0166ab3 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
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V4L/DVB (7731): tuner-xc2028: fix signal strength calculus 



Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent c21f1e2e

drivers/media/video/tuner-xc2028.c

+10 −3
Original line number Diff line number Diff line
@@ -844,21 +844,28 @@ static int xc2028_signal(struct dvb_frontend *fe, u16 *strength) 


	/* Sync Lock Indicator */

	rc = xc2028_get_reg(priv, 0x0002, &frq_lock);

	if (rc < 0 || frq_lock == 0)

	if (rc < 0)

		goto ret;



	/* Frequency is locked. Return signal quality */

	/* Frequency is locked */

	if (frq_lock == 1)

		signal = 32768;



	/* Get SNR of the video signal */

	rc = xc2028_get_reg(priv, 0x0040, &signal);

	if (rc < 0)

		signal = -frq_lock;

		goto ret;



	/* Use both frq_lock and signal to generate the result */

	signal = signal || ((signal & 0x07) << 12);



ret:

	mutex_unlock(&priv->lock);



	*strength = signal;



	tuner_dbg("signal strength is %d\n", signal);



	return rc;

}