> On 07/11/2018 05:26 PM, Lorenzo Bianconi wrote:
> > On Jul 11, Jorge Ramirez-Ortiz wrote:
> > > On 07/11/2018 02:29 PM, Lorenzo Bianconi wrote:
> > > > > Currently IRQ_NONE is returned only when there is no data on the fifo.
> > > > >
> > > > > When there is no data on the fifo the driver can not push to the
> > > > > buffers and therefore user space readers polling for data available
> > > > > will not be awoken and continue to wait.
> > > > >
> > > > > This commit just extends the same semantics to fifo read errors.
> > > > Hi Jorge,
> > > >
> > > > IRQ_NONE is used to indicate this interrupt is not intended for this driver
> > > > (this could happen if the irq line is in open-drain). If the interrupt is for
> > > > st_lsm6dsx I would prefer to return IRQ_HANDLED even in case of error.
> > > yes I understand.
> > >
> > > This was just a trivial attempt (I guess a really bad idea) to get some
> > > debug info (via /proc/irq/.../spurious) any time the driver read (spi/i2c)
> > > fails when processing the data ready irq.
> > > do you think it would make sense to add a dev_err to
> > > st_lsm6dsx_i2c_read/st_lsm6dsx_spi_read? at the moment the driver would fail
> > > silently
> > do you mean something like (just compiled, not tested):
> >
> > --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> > +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> > @@ -298,8 +298,11 @@ static int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
> > err = regmap_bulk_read(hw->regmap,
> > hw->settings->fifo_ops.fifo_diff.addr,
> > &fifo_status, sizeof(fifo_status));
> > - if (err < 0)
> > + if (err < 0) {
> > + dev_err(hw->dev, "failed to read fifo status reg (err=%d)\n",
> > + err);
> > return err;
> > + }
> > if (fifo_status & cpu_to_le16(ST_LSM6DSX_FIFO_EMPTY_MASK))
> > return 0;
> > @@ -313,8 +316,12 @@ static int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
> > for (read_len = 0; read_len < fifo_len; read_len += pattern_len) {
> > err = st_lsm6dsx_read_block(hw, hw->buff, pattern_len);
> > - if (err < 0)
> > + if (err < 0) {
> > + dev_err(hw->dev,
> > + "failed to read pattern from fifo (err=%d)\n",
> > + err);
> > return err;
> > + }
> > /*
> > * Data are written to the FIFO with a specific pattern
> > @@ -385,8 +392,11 @@ static int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
> > if (unlikely(reset_ts)) {
> > err = st_lsm6dsx_reset_hw_ts(hw);
> > - if (err < 0)
> > + if (err < 0) {
> > + dev_err(hw->dev, "failed to reset hw ts (err=%d)\n",
> > + err);
> > return err;
> > + }
> > }
> > return read_len;
> > }
> >
> > Regards,
> > Lorenzo
>
>
> yes, you beat me to it but yes, that is what I was thinking about.
>
Ops, it was not intended as a race :). Feel free to send your patch since you
proposed the idea.
Regards,
Lorenzo
>
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