driver: lsm6dsm: Fix race condition and sensor labeling issues

This commit fixes two issues with the LSM6DSM driver:
  - it fixes a race condition in load_fifo() which could lead
    to samples being labeled at the wrong timestamp if the FIFO
    was cleared, and a new interrupt occurred, between reading the
    last sample, and pushing it to the motion sense queue

 - it drops samples even when the ODR is changed to the same final
   normalized rate, since the sensor is turned off/on regardless
   of this condition; additionally, it adds one more sample to the
   number of samples to be discarded, since I was experimentally
   seeing occasional spurious data in the first sample after a rate
   change.

BUG=b:124085261
TEST=on Meep with magnetometer stuffed, and CL:1470775
     enabled, run CTS sensor test cases

Change-Id: I9701d90fa4e86488840b776e2c7afe4dd89570e7
Signed-off-by: Enrico Granata <egranata@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1509718
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Diana Z <dzigterman@chromium.org>

0 files changed, 0 insertions, 0 deletions