iio: hid-sensor-trigger: Change get poll value function order to avoid sensor propert...
authorSong Hongyan <hongyan.song@intel.com>
Wed, 22 Feb 2017 09:17:38 +0000 (17:17 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 30 Mar 2017 07:41:25 +0000 (09:41 +0200)
commit9808ff151781efa43a6436945bac7629c3f4125b
treee366c68128fd94ddcd28691a5abd08308f3e2327
parentcf43d679ccc51a11fe4488bfc13389fa634ddaee
iio: hid-sensor-trigger: Change get poll value function order to avoid sensor properties losing after resume from S3

commit 3bec247474469f769af41e8c80d3a100dd97dd76 upstream.

In function _hid_sensor_power_state(), when hid_sensor_read_poll_value()
is called, sensor's all properties will be updated by the value from
sensor hardware/firmware.
In some implementation, sensor hardware/firmware will do a power cycle
during S3. In this case, after resume, once hid_sensor_read_poll_value()
is called, sensor's all properties which are kept by driver during S3
will be changed to default value.
But instead, if a set feature function is called first, sensor
hardware/firmware will be recovered to the last status. So change the
sensor_hub_set_feature() calling order to behind of set feature function
to avoid sensor properties lose.

Signed-off-by: Song Hongyan <hongyan.song@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/iio/common/hid-sensors/hid-sensor-trigger.c