* [PATCH] media: rtl28xxu: add missing sleep before probing slave demod
@ 2020-02-19 21:14 Mario Hros
0 siblings, 0 replies; only message in thread
From: Mario Hros @ 2020-02-19 21:14 UTC (permalink / raw)
To: linux-media; +Cc: Mario Hros
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>
---
drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 3 +++
1 file changed, 3 insertions(+)
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 @@ static int rtl2832u_read_config(struct dvb_usb_device *d)
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) {
--
2.25.1
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2020-02-19 21:14 [PATCH] media: rtl28xxu: add missing sleep before probing slave demod Mario Hros
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