Patch "[media] mn88472: fix chip id check on probe" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

[media] mn88472: fix chip id check on probe

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     mn88472-fix-chip-id-check-on-probe.patch

and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Antti Palosaari <[email protected]>
Date: Wed, 30 Nov 2016 22:08:27 -0200
Subject: [media] mn88472: fix chip id check on probe

From: Antti Palosaari <[email protected]>

commit 365fe4e0ce218dc5ad10df17b150a366b6015499 upstream.

A register used to identify chip during probe was overwritten during firmware download and due to that later probe's for warm chip were failing. Detect chip from the another register, which is located on different register bank 2.

---
 drivers/media/dvb-frontends/mn88472.c |   24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

@@ -488,18 +488,6 @@ static int mn88472_probe(struct i2c_clie
 		goto err_kfree;
 	}
 
-	/* Check demod answers with correct chip id */
-	ret = regmap_read(dev->regmap[0], 0xff, &utmp);
-	if (ret)
-		goto err_regmap_0_regmap_exit;
-
-	dev_dbg(&client->dev, "chip id=%02x\n", utmp);
-
-	if (utmp != 0x02) {
-		ret = -ENODEV;
-		goto err_regmap_0_regmap_exit;
-	}
-
 	/*
 	 * Chip has three I2C addresses for different register banks. Used
 	 * addresses are 0x18, 0x1a and 0x1c. We register two dummy clients,

@@ -536,6 +524,18 @@ static int mn88472_probe(struct i2c_clie
 	}
 	i2c_set_clientdata(dev->client[2], dev);
 
+	/* Check demod answers with correct chip id */
+	ret = regmap_read(dev->regmap[2], 0xff, &utmp);
+	if (ret)
+		goto err_regmap_2_regmap_exit;
+
+	dev_dbg(&client->dev, "chip id=%02x\n", utmp);
+
+	if (utmp != 0x02) {
+		ret = -ENODEV;
+		goto err_regmap_2_regmap_exit;
+	}
+
 	/* Sleep because chip is active by default */
 	ret = regmap_write(dev->regmap[2], 0x05, 0x3e);
 	if (ret)

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/mn88473-fix-chip-id-check-on-probe.patch queue-4.9/mn88472-fix-chip-id-check-on-probe.patch