> On Thu, 28 Nov 2019 17:42:30 +0200
> Lorenzo Bianconi <lorenzo@xxxxxxxxxx> wrote:
>
> > Track hw FIFO state introducing fifo_mask since now the accel sensor
> > can be enabled during suspend/resume in order to trigger the wake-up
> > enabling the FIFO in st_lsm6dsx_resume even if it was disabled before
> > the suspend
>
> What is the user visible result of not having this patch?
>
> Otherwise looks fine to me.
Hi Jonathan,
I discovered the issue looking at the code. The main point here is after commit
4c997dfa692d enable_mask can be modified even by event code and not just by
FIFO one, so it can't be used to track FIFO status (e.g during suspend-resume).
Regards,
Lorenzo
>
> Jonathan
>
> >
> > Fixes: 4c997dfa692d ("iio: imu: st_lsm6dsx: add wakeup-source option")
> > Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
> > ---
> > drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h | 4 +--
> > .../iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 25 +++++++++++--------
> > drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 4 +--
> > 3 files changed, 18 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> > index c605b153be41..b54aefcdaad4 100644
> > --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> > +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> > @@ -351,9 +351,9 @@ struct st_lsm6dsx_sensor {
> > * @fifo_lock: Mutex to prevent concurrent access to the hw FIFO.
> > * @conf_lock: Mutex to prevent concurrent FIFO configuration update.
> > * @page_lock: Mutex to prevent concurrent memory page configuration.
> > - * @fifo_mode: FIFO operating mode supported by the device.
> > * @suspend_mask: Suspended sensor bitmask.
> > * @enable_mask: Enabled sensor bitmask.
> > + * @fifo_mask: Enabled hw FIFO bitmask.
> > * @ts_gain: Hw timestamp rate after internal calibration.
> > * @ts_sip: Total number of timestamp samples in a given pattern.
> > * @sip: Total number of samples (acc/gyro/ts) in a given pattern.
> > @@ -373,9 +373,9 @@ struct st_lsm6dsx_hw {
> > struct mutex conf_lock;
> > struct mutex page_lock;
> >
> > - enum st_lsm6dsx_fifo_mode fifo_mode;
> > u8 suspend_mask;
> > u8 enable_mask;
> > + u8 fifo_mask;
> > s64 ts_gain;
> > u8 ts_sip;
> > u8 sip;
> > diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> > index d416990ae309..bfd4c6306c0b 100644
> > --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> > +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> > @@ -176,17 +176,10 @@ int st_lsm6dsx_set_fifo_mode(struct st_lsm6dsx_hw *hw,
> > enum st_lsm6dsx_fifo_mode fifo_mode)
> > {
> > unsigned int data;
> > - int err;
> >
> > data = FIELD_PREP(ST_LSM6DSX_FIFO_MODE_MASK, fifo_mode);
> > - err = st_lsm6dsx_update_bits_locked(hw, ST_LSM6DSX_REG_FIFO_MODE_ADDR,
> > - ST_LSM6DSX_FIFO_MODE_MASK, data);
> > - if (err < 0)
> > - return err;
> > -
> > - hw->fifo_mode = fifo_mode;
> > -
> > - return 0;
> > + return st_lsm6dsx_update_bits_locked(hw, ST_LSM6DSX_REG_FIFO_MODE_ADDR,
> > + ST_LSM6DSX_FIFO_MODE_MASK, data);
> > }
> >
> > static int st_lsm6dsx_set_fifo_odr(struct st_lsm6dsx_sensor *sensor,
> > @@ -608,11 +601,17 @@ int st_lsm6dsx_flush_fifo(struct st_lsm6dsx_hw *hw)
> > int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable)
> > {
> > struct st_lsm6dsx_hw *hw = sensor->hw;
> > + u8 fifo_mask;
> > int err;
> >
> > mutex_lock(&hw->conf_lock);
> >
> > - if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS) {
> > + if (enable)
> > + fifo_mask = hw->fifo_mask | BIT(sensor->id);
> > + else
> > + fifo_mask = hw->fifo_mask & ~BIT(sensor->id);
> > +
> > + if (hw->fifo_mask) {
> > err = st_lsm6dsx_flush_fifo(hw);
> > if (err < 0)
> > goto out;
> > @@ -642,15 +641,19 @@ int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable)
> > if (err < 0)
> > goto out;
> >
> > - if (hw->enable_mask) {
> > + if (fifo_mask) {
> > /* reset hw ts counter */
> > err = st_lsm6dsx_reset_hw_ts(hw);
> > if (err < 0)
> > goto out;
> >
> > err = st_lsm6dsx_set_fifo_mode(hw, ST_LSM6DSX_FIFO_CONT);
> > + if (err < 0)
> > + goto out;
> > }
> >
> > + hw->fifo_mask = fifo_mask;
> > +
> > out:
> > mutex_unlock(&hw->conf_lock);
> >
> > diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> > index 11b2c7bc8041..6f628c3cd133 100644
> > --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> > +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> > @@ -2300,7 +2300,7 @@ static int __maybe_unused st_lsm6dsx_suspend(struct device *dev)
> > hw->suspend_mask |= BIT(sensor->id);
> > }
> >
> > - if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS)
> > + if (hw->fifo_mask)
> > err = st_lsm6dsx_flush_fifo(hw);
> >
> > return err;
> > @@ -2336,7 +2336,7 @@ static int __maybe_unused st_lsm6dsx_resume(struct device *dev)
> > hw->suspend_mask &= ~BIT(sensor->id);
> > }
> >
> > - if (hw->enable_mask)
> > + if (hw->fifo_mask)
> > err = st_lsm6dsx_set_fifo_mode(hw, ST_LSM6DSX_FIFO_CONT);
> >
> > return err;
>
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