af9015: fix SNR report in Enigma2/Kaffeine; SNR is now scaled in the full
0-65536 range; the snrdb module parameter of the af9013 demodulator enables
the SNR output in dBx10 as before.
From: Gianluca Gennari <gennarone@gmail.com>
---
drivers/media/dvb-frontends/af9013.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/media/dvb-frontends/af9013.c b/drivers/media/dvb-frontends/af9013.c
index a204f28..1295487 100644
--- a/drivers/media/dvb-frontends/af9013.c
+++ b/drivers/media/dvb-frontends/af9013.c
@@ -24,6 +24,10 @@
#include "af9013_priv.h"
+int af9013_snrdb;
+module_param_named(snrdb, af9013_snrdb, int, 0644);
+MODULE_PARM_DESC(snrdb, "Turn on/off SNR output as dBx10 (default:off).");
+
struct af9013_state {
struct i2c_adapter *i2c;
struct dvb_frontend fe;
@@ -471,6 +475,9 @@ static int af9013_statistics_snr_result(struct dvb_frontend *fe)
}
state->snr = tmp * 10; /* dB/10 */
+ if (!af9013_snrdb)
+ state->snr = (0xffff / (snr_lut[len - 1].snr * 10)) * state->snr;
+
return ret;
err:
dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
--
1.7.9.5