[media] mb86a20s: add support for serial streams

By comparing the traffic between Pixelview (cx23102-based and Kworld
(saa7134-based), the only difference is at register 0xd5. After some
tests, It seems that it is used to change mode between serial and parallel.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/mb86a20s.c

@@ -43,10 +43,6 @@ struct mb86a20s_state {
 	const struct mb86a20s_config *config;
 
 	struct dvb_frontend frontend;
-
-
-
-
 };
 
 struct regdata {
@@ -175,7 +171,7 @@ static struct regdata mb86a20s_init[] = {
 	{ 0x45, 0x04 },
 	{ 0x48, 0x04 },
 	{ 0x50, 0xd5 },
-	{ 0x51, 0x01 },
+	{ 0x51, 0x01 },		/* Serial */
 	{ 0x50, 0xd6 },
 	{ 0x51, 0x1f },
 	{ 0x50, 0xd2 },
@@ -376,6 +372,7 @@ static int mb86a20s_initfe(struct dvb_frontend *fe)
 {
 	struct mb86a20s_state *state = fe->demodulator_priv;
 	int rc;
+	u8  regD5 = 1;
 
 	dprintk("\n");
 
@@ -384,6 +381,17 @@ static int mb86a20s_initfe(struct dvb_frontend *fe)
 	if (rc < 0)
 		return rc;
 
+	if (!state->config->is_serial) {
+		regD5 &= ~1;
+
+		rc = mb86a20s_writereg(state, 0x50, 0xd5);
+		if (rc < 0)
+			return rc;
+		rc = mb86a20s_writereg(state, 0x51, regD5);
+		if (rc < 0)
+			return rc;
+	}
+
 	return 0;
 }
 

drivers/media/dvb/frontends/mb86a20s.h

@@ -26,6 +26,7 @@
 
 struct mb86a20s_config {
 	u8 demod_address;
+	bool is_serial;
 };
 
 #if defined(CONFIG_DVB_MB86A20S) || (defined(CONFIG_DVB_MB86A20S_MODULE) \

drivers/media/video/cx231xx/cx231xx-dvb.c

@@ -143,6 +143,7 @@ static struct tda18271_config hcw_tda18271_config = {
 
 static const struct mb86a20s_config pv_mb86a20s_config = {
 	.demod_address = 0x10,
+	.is_serial = true,
 };
 
 static struct tda18271_config pv_tda18271_config = {