diff options
author | Dave Airlie <airlied@redhat.com> | 2019-11-14 05:53:10 +1000 |
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committer | Dave Airlie <airlied@redhat.com> | 2019-11-14 05:53:10 +1000 |
commit | 77e0723bd27f830d0903225372aa778fe2975648 (patch) | |
tree | 4c035783e014b3a0ac9174390f88dc75150533e4 /drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | |
parent | Merge tag 'drm-misc-next-fixes-2019-11-06' of git://anongit.freedesktop.org/drm/drm-misc into drm-next (diff) | |
parent | Linux 5.4-rc7 (diff) | |
download | linux-dev-77e0723bd27f830d0903225372aa778fe2975648.tar.xz linux-dev-77e0723bd27f830d0903225372aa778fe2975648.zip |
Merge v5.4-rc7 into drm-next
We have the i915 security fixes to backmerge, but first
let's clear the decks for other drivers to avoid a bigger
mess.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c')
-rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c index 5f9a5de0bab4..72d8c5790076 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c @@ -180,9 +180,6 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p) "failed to ack interrupt\n"); goto flush_fifo; } - /* handle fifo overflow by reseting fifo */ - if (int_status & INV_MPU6050_BIT_FIFO_OVERFLOW_INT) - goto flush_fifo; if (!(int_status & INV_MPU6050_BIT_RAW_DATA_RDY_INT)) { dev_warn(regmap_get_device(st->map), "spurious interrupt with status 0x%x\n", int_status); @@ -211,6 +208,18 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p) if (result) goto end_session; fifo_count = get_unaligned_be16(&data[0]); + + /* + * Handle fifo overflow by resetting fifo. + * Reset if there is only 3 data set free remaining to mitigate + * possible delay between reading fifo count and fifo data. + */ + nb = 3 * bytes_per_datum; + if (fifo_count >= st->hw->fifo_size - nb) { + dev_warn(regmap_get_device(st->map), "fifo overflow reset\n"); + goto flush_fifo; + } + /* compute and process all complete datum */ nb = fifo_count / bytes_per_datum; inv_mpu6050_update_period(st, pf->timestamp, nb); |