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%3Ba=su...
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