[media] dvb-frontends/cxd2841er: make lock wait in set_fe_tc() optional

Don't wait for FE_HAS_LOCK in set_frontend_tc() and thus don't hammer the
lock status register with inquiries when CXD2841ER_NO_WAIT_LOCK is set
in the configuration, which also unneccessarily blocks applications until
a TS LOCK has been acquired. Rather, API and applications will check for
a TS LOCK by utilising the tune fe_op, read_status and get_frontend ops,
which is sufficient.

Signed-off-by: Daniel Scheller <d.scheller@gmx.net>

drivers/media/dvb-frontends/cxd2841er.c

@@ -3518,6 +3518,10 @@ static int cxd2841er_set_frontend_tc(struct dvb_frontend *fe)
 		cxd2841er_tuner_set(fe);
 
 	cxd2841er_tune_done(priv);
+
+	if (priv->flags & CXD2841ER_NO_WAIT_LOCK)
+		goto done;
+
 	timeout = 2500;
 	while (timeout > 0) {
 		ret = cxd2841er_read_status_tc(fe, &status);

drivers/media/dvb-frontends/cxd2841er.h

@@ -30,6 +30,7 @@
 #define CXD2841ER_ASCOT		8	/* bit 3 */
 #define CXD2841ER_EARLY_TUNE	16	/* bit 4 */
 #define CXD2841ER_SLEEPONSWITCH	32	/* bit 5 */
+#define CXD2841ER_NO_WAIT_LOCK	64	/* bit 6 */
 #define CXD2841ER_HW_DDB	8388608	/* bit 23 */
 
 enum cxd2841er_xtal {