The usage of SNR to estimate the signal strength is a poor man's
approach. The best is to use the RF strength as measured by the
tuner. So, use it, if available.
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
---
drivers/media/dvb-frontends/au8522_dig.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/media/dvb-frontends/au8522_dig.c
b/drivers/media/dvb-frontends/au8522_dig.c
index e676b9461a59..ee14fd48c414 100644
--- a/drivers/media/dvb-frontends/au8522_dig.c
+++ b/drivers/media/dvb-frontends/au8522_dig.c
@@ -767,16 +767,30 @@ static int au8522_read_snr(struct dvb_frontend *fe, u16
*snr)
static int au8522_read_signal_strength(struct dvb_frontend *fe,
u16 *signal_strength)
{
- /* borrowed from lgdt330x.c
+ u16 snr;
+ u32 tmp;
+ int ret;
+
+ /* If the tuner has RF strength, use it */
+ if (fe->ops.tuner_ops.get_rf_strength) {
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
+ ret = fe->ops.tuner_ops.get_rf_strength(fe, signal_strength);
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+ return ret;
+ }
+
+ /*
+ * If it doen't, estimate from SNR
+ * (borrowed from lgdt330x.c)
*
* Calculate strength from SNR up to 35dB
* Even though the SNR can go higher than 35dB,
* there is some comfort factor in having a range of
* strong signals that can show at 100%
*/
- u16 snr;
- u32 tmp;
- int ret = au8522_read_snr(fe, &snr);
+ ret = au8522_read_snr(fe, &snr);
*signal_strength = 0;
--
2.7.4
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
