Re: [PATCH] iio: magnetometer: st_magn: fix drdy line configuration for LIS3MDL

[Jonathan Cameron <jic23@kernel.org>]

On Tue, 29 Aug 2017 13:45:11 +0200
Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> wrote:

> Data-ready line in LIS3MDL is routed to drdy pin and it is not possible
> to select a different INT pin. st_sensors_set_dataready_irq() assumes
> that if drdy int address is not exported in register map, irq trigger
> is not supported by the sensor and hw_irq_trigger is always false.
> Based on this configuration st_sensors_irq_thread does not consume
> generated interrupt causing an unhandled irq.
> Fix this taking into account status register address in
> st_sensors_set_dataready_irq()
> 
> Fixes: 90efe0556292 (iio: st_sensors: harden interrupt handling)
> Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Applied to the fixes-togreg-post-rc1 branch of iio.git.

Thanks,

Jonathan.
> ---
>  drivers/iio/common/st_sensors/st_sensors_core.c | 11 ++++++++++-
>  drivers/iio/magnetometer/st_magn_core.c         |  4 ++++
>  2 files changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
> index d99bb1460fe2..02e833b14db0 100644
> --- a/drivers/iio/common/st_sensors/st_sensors_core.c
> +++ b/drivers/iio/common/st_sensors/st_sensors_core.c
> @@ -463,8 +463,17 @@ int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
>  	u8 drdy_mask;
>  	struct st_sensor_data *sdata = iio_priv(indio_dev);
>  
> -	if (!sdata->sensor_settings->drdy_irq.addr)
> +	if (!sdata->sensor_settings->drdy_irq.addr) {
> +		/*
> +		 * there are some devices (e.g. LIS3MDL) where drdy line is
> +		 * routed to a given pin and it is not possible to select a
> +		 * different one. Take into account irq status register
> +		 * to understand if irq trigger can be properly supported
> +		 */
> +		if (sdata->sensor_settings->drdy_irq.addr_stat_drdy)
> +			sdata->hw_irq_trigger = enable;
>  		return 0;
> +	}
>  
>  	/* Enable/Disable the interrupt generator 1. */
>  	if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
> diff --git a/drivers/iio/magnetometer/st_magn_core.c b/drivers/iio/magnetometer/st_magn_core.c
> index 83fdd7230917..f7388d265eb0 100644
> --- a/drivers/iio/magnetometer/st_magn_core.c
> +++ b/drivers/iio/magnetometer/st_magn_core.c
> @@ -315,6 +315,10 @@ static const struct st_sensor_settings st_magn_sensors_settings[] = {
>  				},
>  			},
>  		},
> +		.drdy_irq = {
> +			/* drdy line is routed drdy pin */
> +			.addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
> +		},
>  		.multi_read_bit = true,
>  		.bootime = 2,
>  	},