Patch "[media] mb86a20s: fix the locking logic" has been added to the 4.8-stable tree

Patch "[media] mb86a20s: fix the locking logic" has been added to the 4.8-stable tree

[gregkh]

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

    [media] mb86a20s: fix the locking logic

to the 4.8-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:
     mb86a20s-fix-the-locking-logic.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From dafb65fb98d85d8e78405e82c83e81975e5d5480 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Date: Sun, 4 Sep 2016 10:16:18 -0300
Subject: [media] mb86a20s: fix the locking logic

From: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

commit dafb65fb98d85d8e78405e82c83e81975e5d5480 upstream.

On this frontend, it takes a while to start output normal
TS data. That only happens on state S9. On S8, the TS output
is enabled, but it is not reliable enough.

However, the zigzag loop is too fast to let it sync.

As, on practical tests, the zigzag software loop doesn't
seem to be helping, but just slowing down the tuning, let's
switch to hardware algorithm, as the tuners used on such
devices are capable of work with frequency drifts without
any help from software.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/dvb-frontends/mb86a20s.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/drivers/media/dvb-frontends/mb86a20s.c
+++ b/drivers/media/dvb-frontends/mb86a20s.c
@@ -318,7 +318,11 @@ static int mb86a20s_read_status(struct d
 	if (val >= 7)
 		*status |= FE_HAS_SYNC;
 
-	if (val >= 8)				/* Maybe 9? */
+	/*
+	 * Actually, on state S8, it starts receiving TS, but the TS
+	 * output is only on normal state after the transition to S9.
+	 */
+	if (val >= 9)
 		*status |= FE_HAS_LOCK;
 
 	dev_dbg(&state->i2c->dev, "%s: Status = 0x%02x (state = %d)\n",
@@ -2058,6 +2062,11 @@ static void mb86a20s_release(struct dvb_
 	kfree(state);
 }
 
+static int mb86a20s_get_frontend_algo(struct dvb_frontend *fe)
+{
+        return DVBFE_ALGO_HW;
+}
+
 static struct dvb_frontend_ops mb86a20s_ops;
 
 struct dvb_frontend *mb86a20s_attach(const struct mb86a20s_config *config,
@@ -2130,6 +2139,7 @@ static struct dvb_frontend_ops mb86a20s_
 	.read_status = mb86a20s_read_status_and_stats,
 	.read_signal_strength = mb86a20s_read_signal_strength_from_cache,
 	.tune = mb86a20s_tune,
+	.get_frontend_algo = mb86a20s_get_frontend_algo,
 };
 
 MODULE_DESCRIPTION("DVB Frontend module for Fujitsu mb86A20s hardware");


Patches currently in stable-queue which might be from mchehab@osg.samsung.com are

queue-4.8/cx231xx-don-t-return-error-on-success.patch
queue-4.8/mb86a20s-fix-demod-settings.patch
queue-4.8/cx231xx-fix-gpios-for-pixelview-sbtvd-hybrid.patch
queue-4.8/mb86a20s-fix-the-locking-logic.patch