[media] radio-keene: add delay in order to settle hardware

It was found by trial and error testing that at least 11 ms delay is
needed before first I/O, otherwise device will skip given command.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/media/radio/radio-keene.c b/drivers/media/radio/radio-keene.c
index 99da3d4f8d95..21db23b196be 100644
--- a/drivers/media/radio/radio-keene.c
+++ b/drivers/media/radio/radio-keene.c
@@ -382,6 +382,8 @@ static int usb_keene_probe(struct usb_interface *intf,
         video_set_drvdata(&radio->vdev, radio);
         set_bit(V4L2_FL_USE_FH_PRIO, &radio->vdev.flags);
 
+        /* at least 11ms is needed in order to settle hardware */
+        msleep(20);
         keene_cmd_main(radio, 95.16 * FREQ_MUL, false);
 
         retval = video_register_device(&radio->vdev, VFL_TYPE_RADIO, -1);