Re: [PATCH 4/5] iio: imu: st_lsm6dsx: always enter interrupt thread

[Lorenzo Bianconi <lorenzo@kernel.org>]

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> The interrupt source can come from multiple sources, fifo and wake interrupts.
> Enter interrupt thread to check which interrupt that has fired.
> 
> Signed-off-by: Sean Nyekjaer <sean@geanix.com>
> ---
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 30 +++++++++++++++-----
>  1 file changed, 23 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index 59a34894e495..76aec5024d83 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -78,6 +78,12 @@
>  #define ST_LSM6DSX_REG_GYRO_OUT_Y_L_ADDR	0x24
>  #define ST_LSM6DSX_REG_GYRO_OUT_Z_L_ADDR	0x26
>  
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_ADDR		0x1B
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_Z_WU_MASK	BIT(0)
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_Y_WU_MASK	BIT(1)
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_X_WU_MASK	BIT(2)
> +#define ST_LSM6DSX_REG_WAKE_UP_SRC_WU_MASK	BIT(4)
> +
>  #define ST_LSM6DSX_REG_TAP_CFG_ADDR		0x58
>  #define ST_LSM6DSX_REG_TAP_CFG_INT_EN_MASK	BIT(7)
>  #define ST_LSM6DSX_REG_TAP_CFG_INACT_EN_MASK	GENMASK(6, 5)
> @@ -946,19 +952,29 @@ int st_lsm6dsx_event_setup(struct st_lsm6dsx_hw *hw)
>  
>  static irqreturn_t st_lsm6dsx_handler_irq(int irq, void *private)
>  {
> -	struct st_lsm6dsx_hw *hw = private;
> -
> -	return hw->sip > 0 ? IRQ_WAKE_THREAD : IRQ_NONE;
> +	return IRQ_WAKE_THREAD;

I guess this will break shared interrupt, isn't it?

>  }
>  
>  static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
>  {
>  	struct st_lsm6dsx_hw *hw = private;
> -	int count;
> +	int count = 0;
> +	int data, err;
> +
> +	if (hw->enable_event) {
> +		err = regmap_read(hw->regmap,
> +				  ST_LSM6DSX_REG_WAKE_UP_SRC_ADDR, &data);
> +		if (err < 0)
> +			goto try_fifo;

You can simplify this just doing something like:

		if (err < 0 && !hw->sip)
			return IRQ_NONE;

> +
> +	}
>  
> -	mutex_lock(&hw->fifo_lock);
> -	count = st_lsm6dsx_read_fifo(hw);
> -	mutex_unlock(&hw->fifo_lock);
> +try_fifo:
> +	if (hw->sip > 0) {
> +		mutex_lock(&hw->fifo_lock);
> +		count = st_lsm6dsx_read_fifo(hw);
> +		mutex_unlock(&hw->fifo_lock);
> +	}
>  
>  	return !count ? IRQ_NONE : IRQ_HANDLED;
>  }
> -- 
> 2.22.0
> 

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