Patch "media: [RESEND] media: dvb-frontends: Add delay to Si2168 restart" has been added to the 4.9-stable tree

Patch "media: [RESEND] media: dvb-frontends: Add delay to Si2168 restart" has been added to the 4.9-stable tree

[gregkh]

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

    media: [RESEND] media: dvb-frontends: Add delay to Si2168 restart

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:
     media-media-dvb-frontends-add-delay-to-si2168-restart.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 <stable@vger.kernel.org> know about it.


>From foo@baz Thu Mar 22 14:40:24 CET 2018
From: Ron Economos <w6rz@comcast.net>
Date: Mon, 11 Dec 2017 19:51:53 -0500
Subject: media: [RESEND] media: dvb-frontends: Add delay to Si2168 restart

From: Ron Economos <w6rz@comcast.net>


[ Upstream commit 380a6c86457573aa42d27ae11e025eb25941a0b7 ]

On faster CPUs a delay is required after the resume command and the restart command. Without the delay, the restart command often returns -EREMOTEIO and the Si2168 does not restart.

Note that this patch fixes the same issue as https://patchwork.linuxtv.org/patch/44304/, but I believe my udelay() fix addresses the actual problem.

Signed-off-by: Ron Economos <w6rz@comcast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/media/dvb-frontends/si2168.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/media/dvb-frontends/si2168.c
+++ b/drivers/media/dvb-frontends/si2168.c
@@ -14,6 +14,8 @@
  *    GNU General Public License for more details.
  */
 
+#include <linux/delay.h>
+
 #include "si2168_priv.h"
 
 static const struct dvb_frontend_ops si2168_ops;
@@ -378,6 +380,7 @@ static int si2168_init(struct dvb_fronte
 		if (ret)
 			goto err;
 
+		udelay(100);
 		memcpy(cmd.args, "\x85", 1);
 		cmd.wlen = 1;
 		cmd.rlen = 1;


Patches currently in stable-queue which might be from w6rz@comcast.net are

queue-4.9/media-media-dvb-frontends-add-delay-to-si2168-restart.patch