gistfile1.c

Here is alternative ndiv code, it is based on vendors code.

It uses the ndiv value not frequency to change the divider.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
---
 drivers/media/dvb-frontends/ts2020.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/media/dvb-frontends/ts2020.c b/drivers/media/dvb-frontends/ts2020.c
index 9aba044..9e051efb 100644
--- a/drivers/media/dvb-frontends/ts2020.c
+++ b/drivers/media/dvb-frontends/ts2020.c
@@ -186,22 +186,27 @@ static int ts2020_set_params(struct dvb_frontend *fe)
 	struct ts2020_priv *priv = fe->tuner_priv;
 	int ret;
 	u32 frequency = c->frequency;
-	s32 offset_khz;
+	u32 offset_khz, ndiv_mul;
 	u32 symbol_rate = (c->symbol_rate / 1000);
 	u32 f3db, gdiv28;
 	u16 value, ndiv, lpf_coeff;
 	u8 lpf_mxdiv, mlpf_max, mlpf_min, nlpf;
 	u8 lo = 0x01, div4 = 0x0;
 
+	ndiv = (u16)((frequency * 14 * 2 + TS2020_XTAL_FREQ / 2)
+			/ TS2020_XTAL_FREQ);
+
 	/* Calculate frequency divider */
-	if (frequency < priv->frequency_div) {
+	if (ndiv < 1100) {
 		lo |= 0x10;
 		div4 = 0x1;
-		ndiv = (frequency * 14 * 4) / TS2020_XTAL_FREQ;
-	} else
-		ndiv = (frequency * 14 * 2) / TS2020_XTAL_FREQ;
-	ndiv = ndiv + ndiv % 2;
-	ndiv = ndiv - 1024;
+		ndiv = (u16)((frequency * 14 * 4 + TS2020_XTAL_FREQ / 2)
+					/ TS2020_XTAL_FREQ) - 1024;
+		ndiv_mul = ndiv + 1024;
+	} else {
+		ndiv -= 1024;
+		ndiv_mul = ndiv - ndiv % 2 + 1024;
+	}
 
 	ret = ts2020_writereg(fe, 0x10, 0x80 | lo);
 
@@ -272,9 +277,8 @@ static int ts2020_set_params(struct dvb_frontend *fe)
 	ret |= ts2020_tuner_gate_ctrl(fe, 0x01);
 
 	msleep(80);
-	/* calculate offset assuming 96000kHz*/
-	offset_khz = (ndiv - ndiv % 2 + 1024) * TS2020_XTAL_FREQ
-		/ (6 + 8) / (div4 + 1) / 2;
+
+	offset_khz = ndiv_mul * TS2020_XTAL_FREQ / 14 / (div4 + 1) / 2;
 
 	priv->frequency = offset_khz;