V4L/DVB (13334): stv6110: add configurable gain

It has positive effect for NetUP Dual DVB-S2 CI card.
Signed-off-by: NAbylay Ospan <aospan@netup.ru>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/stv6110.c

@@ -37,6 +37,7 @@ struct stv6110_priv {
 
 	u32 mclk;
 	u8 clk_div;
+	u8 gain;
 	u8 regs[8];
 };
 
@@ -255,7 +256,7 @@ static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency)
 	u8 ret = 0x04;
 	u32 divider, ref, p, presc, i, result_freq, vco_freq;
 	s32 p_calc, p_calc_opt = 1000, r_div, r_div_opt = 0, p_val;
-	s32 srate; u8 gain;
+	s32 srate;
 
 	dprintk("%s, freq=%d kHz, mclk=%d Hz\n", __func__,
 						frequency, priv->mclk);
@@ -273,15 +274,8 @@ static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency)
 	} else
 		srate = 15000000;
 
-	if (srate >= 15000000)
-		gain = 3; /* +6 dB */
-	else if (srate >= 5000000)
-		gain = 3; /* +6 dB */
-	else
-		gain = 3; /* +6 dB */
-
 	priv->regs[RSTV6110_CTRL2] &= ~0x0f;
-	priv->regs[RSTV6110_CTRL2] |= (gain & 0x0f);
+	priv->regs[RSTV6110_CTRL2] |= (priv->gain & 0x0f);
 
 	if (frequency <= 1023000) {
 		p = 1;
@@ -436,6 +430,7 @@ struct dvb_frontend *stv6110_attach(struct dvb_frontend *fe,
 	priv->i2c = i2c;
 	priv->mclk = config->mclk;
 	priv->clk_div = config->clk_div;
+	priv->gain = config->gain;
 
 	memcpy(&priv->regs, &reg0[1], 8);
 

drivers/media/dvb/frontends/stv6110.h

@@ -41,6 +41,7 @@
 struct stv6110_config {
 	u8 i2c_address;
 	u32 mclk;
+	u8 gain;
 	u8 clk_div;	/* divisor value for the output clock */
 };
 

drivers/media/video/cx23885/cx23885-dvb.c

@@ -414,12 +414,14 @@ static struct stv6110_config netup_stv6110_tunerconfig_a = {
 	.i2c_address = 0x60,
 	.mclk = 16000000,
 	.clk_div = 1,
+	.gain = 8, /* +16 dB  - maximum gain */
 };
 
 static struct stv6110_config netup_stv6110_tunerconfig_b = {
 	.i2c_address = 0x63,
 	.mclk = 16000000,
 	.clk_div = 1,
+	.gain = 8, /* +16 dB  - maximum gain */
 };
 
 static int tbs_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)