[media] dvb-frontends/cxd2841er: sleep on delivery system switch

Again, maybe depending on the hardware constellation (demod/tuner combo),
the demodulator might be needed to put to sleep when the requested
delivery system differs from the last used one (this is for example the
case when tuning from a DVB-T to a DVB-T2 mux or vice versa), else
proper tuning and TS delivery will fail for the "new" delivery system.
This is the case at least with Digital Devices hardware, so add a
flag to toggle this behaviour.

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

drivers/media/dvb-frontends/cxd2841er.c

@@ -3405,6 +3405,30 @@ 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_SLEEPONSWITCH)
+		&& (priv->state == STATE_ACTIVE_TC)) {
+		if (priv->system != p->delivery_system) {
+			dev_dbg(&priv->i2c->dev, "%s(): sleep due to delivery system switch (%d != %d)\n",
+				__func__, priv->system, p->delivery_system);
+			switch (priv->system) {
+			case SYS_DVBT:
+				cxd2841er_active_t_to_sleep_tc(priv);
+				break;
+			case SYS_DVBT2:
+				cxd2841er_active_t2_to_sleep_tc(priv);
+				break;
+			case SYS_ISDBT:
+				cxd2841er_active_i_to_sleep_tc(priv);
+				break;
+			case SYS_DVBC_ANNEX_A:
+				cxd2841er_active_c_to_sleep_tc(priv);
+				break;
+			default:
+				break;
+			}
+		}
+	}
+
 	if (priv->flags & CXD2841ER_EARLY_TUNE)
 		cxd2841er_tuner_set(fe);
 

drivers/media/dvb-frontends/cxd2841er.h

@@ -29,6 +29,7 @@
 #define CXD2841ER_TS_SERIAL	4	/* bit 2 */
 #define CXD2841ER_ASCOT		8	/* bit 3 */
 #define CXD2841ER_EARLY_TUNE	16	/* bit 4 */
+#define CXD2841ER_SLEEPONSWITCH	32	/* bit 5 */
 #define CXD2841ER_HW_DDB	8388608	/* bit 23 */
 
 enum cxd2841er_xtal {