redonkable/alistair23-linux
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media: rtl28xxu: add missing sleep before probing slave demod

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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>
This commit is contained in:
Mario Hros 2020-02-19 22:14:19 +01:00 committed by Mauro Carvalho Chehab
parent 806d06161a
commit 62d1928531
1 changed files with 3 additions and 0 deletions
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3
drivers/media/usb/dvb-usb-v2/rtl28xxu.c
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@ -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) {