diff options
author | Stanislaw Gruszka <[email protected]> | 2024-11-12 08:55:13 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <[email protected]> | 2024-11-12 12:17:26 +0100 |
commit | 2481af79671a6603fce201cbbc48f31e488e9fae (patch) | |
tree | e3c2dbc2c600c2e9dd55c5ccee807a1bc2850d39 /tools/perf/scripts/python/export-to-postgresql.py | |
parent | 5c5d8eb8af06df615e8b1dc88e5847196c846045 (diff) |
usb: misc: ljca: set small runtime autosuspend delay
On some Lenovo platforms, the patch works around 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: [email protected]
Reviewed-by: Hans de Goede <[email protected]>
Tested-by: Hans de Goede <[email protected]> # ThinkPad X1 Yoga Gen 8, ov2740
Acked-by: Sakari Ailus <[email protected]>
Signed-off-by: Stanislaw Gruszka <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions