V4L/DVB (7070): Fix some tuning problems

The attached patch solves all my vdr tuning problems on a dib7000p
nova-t stick as far as I could check within the last weekend.

It disables streaming while tuning, like that the number of faulty TS
packets is reduced.

Signed-off-by: Soeren Moch <[e-mail]>
Signed-off-by: Patrick Boettcher <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb/frontends/dib3000mc.c

···
 				struct dvb_frontend_parameters *fep)
 {
 	struct dib3000mc_state *state = fe->demodulator_priv;
+    int ret;
+
+	dib3000mc_set_output_mode(state, OUTMODE_HIGH_Z);
 
 	state->current_bandwidth = fep->u.ofdm.bandwidth;
 	dib3000mc_set_bandwidth(state, BANDWIDTH_TO_KHZ(fep->u.ofdm.bandwidth));
···
 		dib3000mc_get_frontend(fe, fep);
 	}
 
+    ret = dib3000mc_tune(fe, fep);
+
 	/* make this a config parameter */
 	dib3000mc_set_output_mode(state, OUTMODE_MPEG2_FIFO);
-
-	return dib3000mc_tune(fe, fep);
+    return ret;
 }
 
 static int dib3000mc_read_status(struct dvb_frontend *fe, fe_status_t *stat)

drivers/media/dvb/frontends/dib7000m.c

···
 				struct dvb_frontend_parameters *fep)
 {
 	struct dib7000m_state *state = fe->demodulator_priv;
-	int time;
+	int time, ret;
+
+    dib7000m_set_output_mode(state, OUTMODE_HIGH_Z);
 
 	state->current_bandwidth = fep->u.ofdm.bandwidth;
 	dib7000m_set_bandwidth(state, BANDWIDTH_TO_KHZ(fep->u.ofdm.bandwidth));
···
 		dib7000m_get_frontend(fe, fep);
 	}
 
+	ret = dib7000m_tune(fe, fep);
+
 	/* make this a config parameter */
 	dib7000m_set_output_mode(state, OUTMODE_MPEG2_FIFO);
-
-	return dib7000m_tune(fe, fep);
+	return ret;
 }
 
 static int dib7000m_read_status(struct dvb_frontend *fe, fe_status_t *stat)

drivers/media/dvb/frontends/dib7000p.c

···
 				struct dvb_frontend_parameters *fep)
 {
 	struct dib7000p_state *state = fe->demodulator_priv;
-	int time;
+	int time, ret;
 
+	dib7000p_set_output_mode(state, OUTMODE_HIGH_Z);
 	state->current_bandwidth = fep->u.ofdm.bandwidth;
 	dib7000p_set_bandwidth(state, BANDWIDTH_TO_KHZ(fep->u.ofdm.bandwidth));
 
···
 		dib7000p_get_frontend(fe, fep);
 	}
 
+	ret = dib7000p_tune(fe, fep);
+
 	/* make this a config parameter */
 	dib7000p_set_output_mode(state, OUTMODE_MPEG2_FIFO);
-
-	return dib7000p_tune(fe, fep);
+    return ret;
 }
 
 static int dib7000p_read_status(struct dvb_frontend *fe, fe_status_t *stat)