media: si2168: change ts bus control logic

Move the ts bus control function moved higher, enabling it
after configuring frontend and removeing ts_bus_ctrl callback.

While here, also add an error checking and re-add a comment
that were removed by commit 44587774 ("media: si2168:
Add ts bus coontrol, turn off bus on sleep").

[mchehab@s-opensource.com: I ended by applying the first version,
 instead of the right one. So, this patch contains the diff and
 the v2 changelog instead]

Fixes: 44587774 ("media: si2168: Add ts bus coontrol, turn off bus on sleep")
Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/si2168.c

@@ -82,6 +82,30 @@ static int si2168_cmd_execute(struct i2c_client *client, struct si2168_cmd *cmd)
 	return ret;
 }
 
+static int si2168_ts_bus_ctrl(struct dvb_frontend *fe, int acquire)
+{
+	struct i2c_client *client = fe->demodulator_priv;
+	struct si2168_dev *dev = i2c_get_clientdata(client);
+	struct si2168_cmd cmd;
+	int ret = 0;
+
+	dev_dbg(&client->dev, "%s acquire: %d\n", __func__, acquire);
+
+	/* set TS_MODE property */
+	memcpy(cmd.args, "\x14\x00\x01\x10\x10\x00", 6);
+	if (acquire)
+		cmd.args[4] |= dev->ts_mode;
+	else
+		cmd.args[4] |= SI2168_TS_TRISTATE;
+	if (dev->ts_clock_gapped)
+		cmd.args[4] |= 0x40;
+	cmd.wlen = 6;
+	cmd.rlen = 4;
+	ret = si2168_cmd_execute(client, &cmd);
+
+	return ret;
+}
+
 static int si2168_read_status(struct dvb_frontend *fe, enum fe_status *status)
 {
 	struct i2c_client *client = fe->demodulator_priv;
@@ -405,36 +429,17 @@ static int si2168_set_frontend(struct dvb_frontend *fe)
 
 	dev->delivery_system = c->delivery_system;
 
+	/* enable ts bus */
+	ret = si2168_ts_bus_ctrl(fe, 1);
+	if (ret)
+		goto err;
+
 	return 0;
 err:
 	dev_dbg(&client->dev, "failed=%d\n", ret);
 	return ret;
 }
 
-static int si2168_ts_bus_ctrl(struct dvb_frontend *fe, int acquire)
-{
-	struct i2c_client *client = fe->demodulator_priv;
-	struct si2168_dev *dev = i2c_get_clientdata(client);
-	struct si2168_cmd cmd;
-	int ret = 0;
-
-	dev_dbg(&client->dev, "%s acquire: %d\n", __func__, acquire);
-
-	/* set TS_MODE property */
-	memcpy(cmd.args, "\x14\x00\x01\x10\x10\x00", 6);
-	if (acquire)
-		cmd.args[4] |= dev->ts_mode;
-	else
-		cmd.args[4] |= SI2168_TS_TRISTATE;
-	if (dev->ts_clock_gapped)
-		cmd.args[4] |= 0x40;
-	cmd.wlen = 6;
-	cmd.rlen = 4;
-	ret = si2168_cmd_execute(client, &cmd);
-
-	return ret;
-}
-
 static int si2168_init(struct dvb_frontend *fe)
 {
 	struct i2c_client *client = fe->demodulator_priv;
@@ -566,6 +571,7 @@ static int si2168_init(struct dvb_frontend *fe)
 		 dev->version >> 24 & 0xff, dev->version >> 16 & 0xff,
 		 dev->version >> 8 & 0xff, dev->version >> 0 & 0xff);
 
+	/* set ts mode */
 	ret = si2168_ts_bus_ctrl(fe, 1);
 	if (ret)
 		goto err;
@@ -604,7 +610,9 @@ static int si2168_sleep(struct dvb_frontend *fe)
 	dev->active = false;
 
 	/* tri-state data bus */
-	si2168_ts_bus_ctrl(fe, 0);
+	ret = si2168_ts_bus_ctrl(fe, 0);
+	if (ret)
+		goto err;
 
 	/* Firmware B 4.0-11 or later loses warm state during sleep */
 	if (dev->version > ('B' << 24 | 4 << 16 | 0 << 8 | 11 << 0))
@@ -703,8 +711,6 @@ static const struct dvb_frontend_ops si2168_ops = {
 	.init = si2168_init,
 	.sleep = si2168_sleep,
 
-	.ts_bus_ctrl          = si2168_ts_bus_ctrl,
-
 	.set_frontend = si2168_set_frontend,
 
 	.read_status = si2168_read_status,