[PATCH] af9035: fix dual tuner detection with PCTV 79e

["Stefan Pöschel" <basic.master@gmx.de>]

The value 5 of the EEPROM_TS_MODE register (meaning dual tuner presence) is
only valid for AF9035 devices. For IT9135 devices it is invalid and led to a
false positive dual tuner mode detection with PCTV 79e.
Therefore on non-AF9035 devices and with value 5 the driver now defaults to
single tuner mode and outputs a regarding info message to log.

This fixes Bugzilla bug #118561.

Reported-by: Marc Duponcheel <marc@offline.be>
Signed-off-by: Stefan Pöschel <basic.master@gmx.de>
---
 drivers/media/usb/dvb-usb-v2/af9035.c | 50 +++++++++++++++++++++++------------
 drivers/media/usb/dvb-usb-v2/af9035.h |  2 +-
 2 files changed, 34 insertions(+), 18 deletions(-)

diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c b/drivers/media/usb/dvb-usb-v2/af9035.c
index eabede4..ca018cd 100644
--- a/drivers/media/usb/dvb-usb-v2/af9035.c
+++ b/drivers/media/usb/dvb-usb-v2/af9035.c
@@ -496,7 +496,8 @@ static int af9035_identify_state(struct dvb_usb_device *d, const char **name)
 {
 	struct state *state = d_to_priv(d);
 	struct usb_interface *intf = d->intf;
-	int ret;
+	int ret, ts_mode_invalid;
+	u8 tmp;
 	u8 wbuf[1] = { 1 };
 	u8 rbuf[4];
 	struct usb_req req = { CMD_FW_QUERYINFO, 0, sizeof(wbuf), wbuf,
@@ -530,6 +531,36 @@ static int af9035_identify_state(struct dvb_usb_device *d, const char **name)
 		state->eeprom_addr = EEPROM_BASE_AF9035;
 	}

+
+	/* check for dual tuner mode */
+	ret = af9035_rd_reg(d, state->eeprom_addr + EEPROM_TS_MODE, &tmp);
+	if (ret < 0)
+		goto err;
+
+	ts_mode_invalid = 0;
+	switch (tmp) {
+	case 0:
+		break;
+	case 1:
+	case 3:
+		state->dual_mode = true;
+		break;
+	case 5:
+		if (state->chip_type != 0x9135 && state->chip_type != 0x9306)
+			state->dual_mode = true;	/* AF9035 */
+		else
+			ts_mode_invalid = 1;
+		break;
+	default:
+		ts_mode_invalid = 1;
+	}
+
+	dev_dbg(&intf->dev, "ts mode=%d dual mode=%d\n", tmp, state->dual_mode);
+
+	if (ts_mode_invalid)
+		dev_info(&intf->dev, "ts mode=%d not supported, defaulting to single tuner mode!", tmp);
+
+
 	ret = af9035_ctrl_msg(d, &req);
 	if (ret < 0)
 		goto err;
@@ -698,11 +729,7 @@ static int af9035_download_firmware(struct dvb_usb_device *d,
 	 * which is done by master demod.
 	 * Master feeds also clock and controls power via GPIO.
 	 */
-	ret = af9035_rd_reg(d, state->eeprom_addr + EEPROM_TS_MODE, &tmp);
-	if (ret < 0)
-		goto err;
-
-	if (tmp == 1 || tmp == 3 || tmp == 5) {
+	if (state->dual_mode) {
 		/* configure gpioh1, reset & power slave demod */
 		ret = af9035_wr_reg_mask(d, 0x00d8b0, 0x01, 0x01);
 		if (ret < 0)
@@ -835,17 +862,6 @@ static int af9035_read_config(struct dvb_usb_device *d)
 	}


-
-	/* check if there is dual tuners */
-	ret = af9035_rd_reg(d, state->eeprom_addr + EEPROM_TS_MODE, &tmp);
-	if (ret < 0)
-		goto err;
-
-	if (tmp == 1 || tmp == 3 || tmp == 5)
-		state->dual_mode = true;
-
-	dev_dbg(&intf->dev, "ts mode=%d dual mode=%d\n", tmp, state->dual_mode);
-
 	if (state->dual_mode) {
 		/* read 2nd demodulator I2C address */
 		ret = af9035_rd_reg(d,
diff --git a/drivers/media/usb/dvb-usb-v2/af9035.h b/drivers/media/usb/dvb-usb-v2/af9035.h
index c91d1a3..1f83c92 100644
--- a/drivers/media/usb/dvb-usb-v2/af9035.h
+++ b/drivers/media/usb/dvb-usb-v2/af9035.h
@@ -113,7 +113,7 @@ static const u32 clock_lut_it9135[] = {
  * 0  TS
  * 1  DCA + PIP
  * 3  PIP
- * 5  DCA + PIP
+ * 5  DCA + PIP (AF9035 only)
  * n  DCA
  *
  * Values 0, 3 and 5 are seen to this day. 0 for single TS and 3/5 for dual TS.
-- 
2.9.0