[media] dvb-frontends/cxd2841er: optionally tune earlier in set_frontend()

When AUTO_IFHZ is set and the tuner is supposed to provide proper IF speed
values, it should be possible to have the tuner setup take place before
the demod is configured, else the demod might be configured with either
wrong (old), or even no values at all, which obviously will cause issues.
To set this behaviour in the most flexible way, this is done with a
separate flag instead of making this depend on AUTO_IFHZ.

It should be evaluated if tuning shouldn't take place earlier in all cases
and hardware constellations.
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Acked-by: Abylay Ospan <aospan@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/cxd2841er.c

@@ -3306,6 +3306,10 @@ static int cxd2841er_set_frontend_s(struct dvb_frontend *fe)
 		__func__,
 		(p->delivery_system == SYS_DVBS ? "DVB-S" : "DVB-S2"),
 		 p->frequency, symbol_rate, priv->xtal);
+
+	if (priv->flags & CXD2841ER_EARLY_TUNE)
+		cxd2841er_tuner_set(fe);
+
 	switch (priv->state) {
 	case STATE_SLEEP_S:
 		ret = cxd2841er_sleep_s_to_active_s(
@@ -3325,6 +3329,7 @@ static int cxd2841er_set_frontend_s(struct dvb_frontend *fe)
 		goto done;
 	}
 
+	if (!(priv->flags & CXD2841ER_EARLY_TUNE))
 		cxd2841er_tuner_set(fe);
 
 	cxd2841er_tune_done(priv);
@@ -3365,6 +3370,10 @@ static int cxd2841er_set_frontend_tc(struct dvb_frontend *fe)
 
 	dev_dbg(&priv->i2c->dev, "%s() delivery_system=%d bandwidth_hz=%d\n",
 		 __func__, p->delivery_system, p->bandwidth_hz);
+
+	if (priv->flags & CXD2841ER_EARLY_TUNE)
+		cxd2841er_tuner_set(fe);
+
 	if (p->delivery_system == SYS_DVBT) {
 		priv->system = SYS_DVBT;
 		switch (priv->state) {
@@ -3447,6 +3456,7 @@ static int cxd2841er_set_frontend_tc(struct dvb_frontend *fe)
 	if (ret)
 		goto done;
 
+	if (!(priv->flags & CXD2841ER_EARLY_TUNE))
 		cxd2841er_tuner_set(fe);
 
 	cxd2841er_tune_done(priv);

drivers/media/dvb-frontends/cxd2841er.h

@@ -28,6 +28,7 @@
 #define CXD2841ER_AUTO_IFHZ	2	/* bit 1 */
 #define CXD2841ER_TS_SERIAL	4	/* bit 2 */
 #define CXD2841ER_ASCOT		8	/* bit 3 */
+#define CXD2841ER_EARLY_TUNE	16	/* bit 4 */
 
 enum cxd2841er_xtal {
 	SONY_XTAL_20500, /* 20.5 MHz */