There are several bugs at the signal strength algorithm:
- It is using logical OR, instead of bit OR;
- It doesn't wait up to 18 ms as it should;
- the strength range is not ok.
Rework on it, in order to make it work.
Signed-off-by: Mauro Carvalho Chehab <mche...@redhat.com>
---
drivers/media/common/tuners/tuner-xc2028.c | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)
diff --git a/drivers/media/common/tuners/tuner-xc2028.c
b/drivers/media/common/tuners/tuner-xc2028.c
index 9638a69..42fdf5c 100644
--- a/drivers/media/common/tuners/tuner-xc2028.c
+++ b/drivers/media/common/tuners/tuner-xc2028.c
@@ -903,7 +903,7 @@ static int xc2028_signal(struct dvb_frontend *fe, u16
*strength)
{
struct xc2028_data *priv = fe->tuner_priv;
u16 frq_lock, signal = 0;
- int rc;
+ int rc, i;
tuner_dbg("%s called\n", __func__);
@@ -914,21 +914,28 @@ static int xc2028_signal(struct dvb_frontend *fe, u16
*strength)
mutex_lock(&priv->lock);
/* Sync Lock Indicator */
- rc = xc2028_get_reg(priv, XREG_LOCK, &frq_lock);
- if (rc < 0)
- goto ret;
+ for (i = 0; i < 3; i++) {
+ rc = xc2028_get_reg(priv, XREG_LOCK, &frq_lock);
+ if (rc < 0)
+ goto ret;
- /* Frequency is locked */
- if (frq_lock == 1)
- signal = 1 << 11;
+ if (frq_lock)
+ break;
+ msleep(6);
+ }
+
+ /* Frequency was not locked */
+ if (frq_lock == 2)
+ goto ret;
/* Get SNR of the video signal */
rc = xc2028_get_reg(priv, XREG_SNR, &signal);
if (rc < 0)
goto ret;
- /* Use both frq_lock and signal to generate the result */
- signal = signal || ((signal & 0x07) << 12);
+ /* Signal level is 3 bits only */
+
+ signal = ((1 << 12) - 1) | ((signal & 0x07) << 12);
ret:
mutex_unlock(&priv->lock);
--
1.7.10.4
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