[PATCH 4.14 17/77] media: [RESEND] media: dvb-frontends: Add delay to Si2168 restart
From: Greg Kroah-Hartman
Date: Fri Mar 23 2018 - 06:01:34 EST
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ron Economos <w6rz@xxxxxxxxxxx>
[ 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@xxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
@@ -435,6 +437,7 @@ static int si2168_init(struct dvb_fronte
if (ret)
goto err;
+ udelay(100);
memcpy(cmd.args, "\x85", 1);
cmd.wlen = 1;
cmd.rlen = 1;