[PATCH AUTOSEL for 4.4 084/101] media: [RESEND] media: dvb-frontends: Add delay to Si2168 restart

Sasha Levin
2018-03-08T05:07:22Z

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>
---
drivers/media/dvb-frontends/si2168.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/media/dvb-frontends/si2168.c b/drivers/media/dvb-frontends/si2168.c
index 821a8f481507..9d6270591858 100644
--- 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;
@@ -420,6 +422,7 @@ static int si2168_init(struct dvb_frontend *fe)
if (ret)
goto err;

+ udelay(100);
memcpy(cmd.args, "\x85", 1);
cmd.wlen = 1;
cmd.rlen = 1;
--
2.14.1