V4L/DVB (11059): xc5000: fix bug for hybrid xc5000 devices with IF other than 5380

The xc5000 driver has a bug where the IF is always set to whatever the first
caller to dvb_attach() provides.  This fails when the device requires an IF
other than 5380 and the analog driver is loaded first through tuner-core
(which always supplies the hard-coded value of 5380).

Thanks to Michael Krufky <mkrufky@linuxtv.org> and Steven Toth
<stoth@linuxtv.org> for providing sample hardware, engineering level support,
and testing.

Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/common/tuners/xc5000.c

@@ -973,8 +973,6 @@ struct dvb_frontend *xc5000_attach(struct dvb_frontend *fe,
 	case 1:
 		/* new tuner instance */
 		priv->bandwidth = BANDWIDTH_6_MHZ;
-		priv->if_khz = cfg->if_khz;
-
 		fe->tuner_priv = priv;
 		break;
 	default:
@@ -983,6 +981,13 @@ struct dvb_frontend *xc5000_attach(struct dvb_frontend *fe,
 		break;
 	}
 
+	if (priv->if_khz == 0) {
+		/* If the IF hasn't been set yet, use the value provided by
+		   the caller (occurs in hybrid devices where the analog
+		   call to xc5000_attach occurs before the digital side) */
+		priv->if_khz = cfg->if_khz;
+	}
+
 	/* Check if firmware has been loaded. It is possible that another
 	   instance of the driver has loaded the firmware.
 	 */

drivers/media/video/tuner-core.c

@@ -452,7 +452,8 @@ static void set_type(struct i2c_client *c, unsigned int type,
 		struct dvb_tuner_ops *xc_tuner_ops;
 
 		xc5000_cfg.i2c_address	  = t->i2c->addr;
-		xc5000_cfg.if_khz	  = 5380;
+		/* if_khz will be set when the digital dvb_attach() occurs */
+		xc5000_cfg.if_khz	  = 0;
 		if (!dvb_attach(xc5000_attach,
 				&t->fe, t->i2c->adapter, &xc5000_cfg))
 			goto attach_failed;