| From | Sasha Levin <> | Subject | [PATCH AUTOSEL for 4.15 23/78] media: [RESEND] media: dvb-frontends: Add delay to Si2168 restart | Date | Thu, 8 Mar 2018 04:56:11 +0000 |
| |
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 41d9c513b7e8..539399dac551 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; @@ -435,6 +437,7 @@ 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
|