4.15-stable review patch. If anyone has any objections, please let me know.
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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; @@ -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;