On some Lenovo platforms, the patch workarounds problems with ov2740
sensor initialization, which manifest themself like below:
[ 4.540476] ov2740 i2c-INT3474:01: error -EIO: failed to find sensor
[ 4.542066] ov2740 i2c-INT3474:01: probe with driver ov2740 failed with error -5
or
[ 7.742633] ov2740 i2c-INT3474:01: chip id mismatch: 2740 != 0
[ 7.742638] ov2740 i2c-INT3474:01: error -ENXIO: failed to find sensor
and also by random failures of video stream start.
Issue can be reproduced by this script:
n=0
k=0
while [ $n -lt 50 ] ; do
sudo modprobe -r ov2740
sleep `expr $RANDOM % 5`
sudo modprobe ov2740
if media-ctl -p | grep -q ov2740 ; then
let k++
fi
let n++
done
echo Success rate $k/$n
Without the patch, success rate is approximately 15 or 50 tries.
With the patch it does not fail.
This problem is some hardware or firmware malfunction, that can not be
easy debug and fix. While setting small autosuspend delay is not perfect
workaround as user can configure it to any value, it will prevent
the failures by default.
Additionally setting small autosuspend delay should have positive effect
on power consumption as for most ljca workloads device is used for just
a few milliseconds flowed by long periods of at least 100ms of inactivity
(usually more).
Fixes: acd6199f195d ("usb: Add support for Intel LJCA device")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@xxxxxxxxxxxxxxx>
---
drivers/usb/misc/usb-ljca.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/usb/misc/usb-ljca.c b/drivers/usb/misc/usb-ljca.c
index dcb3c5d248ac..062b7fb47114 100644
--- a/drivers/usb/misc/usb-ljca.c
+++ b/drivers/usb/misc/usb-ljca.c
@@ -810,6 +810,7 @@ static int ljca_probe(struct usb_interface *interface,
if (ret)
goto err_free;
+ pm_runtime_set_autosuspend_delay(&usb_dev->dev, 10);
usb_enable_autosuspend(usb_dev);
return 0;
--
2.34.1
