From: Mario Hros <git@reversity.org>
Date: Wed, 19 Feb 2020 21:14:19 +0000 (+0100)
Subject: media: rtl28xxu: add missing sleep before probing slave demod
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=62d19285312004bf5980d9b6c95c6bd378612f06;p=openwrt%2Fstaging%2Fblogic.git

media: rtl28xxu: add missing sleep before probing slave demod

Slave demod needs some time to wake up otherwise it may not respond to the
following probe commands. This problem manifested randomly on my Astrometa
DVB-T2 dongle.

Signed-off-by: Mario Hros <git@reversity.org>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---

diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
index c6881a1b3232..2080f6ef4be1 100644
--- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
+++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
@@ -552,6 +552,9 @@ tuner_found:
 		if (ret)
 			goto err;
 
+		/* slave demod needs some time to wake up */
+		msleep(20);
+
 		/* check slave answers */
 		ret = rtl28xxu_ctrl_msg(d, &req_mn88472);
 		if (ret == 0 && buf[0] == 0x02) {