On Tue, 2023-05-02 at 19:29 +0900, Masahiro Honda wrote:
> The Sigma-Delta ADCs supported by this driver can use SDO as an interrupt
> line to indicate the completion of a conversion. However, some devices
> cannot properly detect the completion of a conversion by an interrupt.
> This is for the reason mentioned in the following commit.
>
> commit e9849777d0e2 ("genirq: Add flag to force mask in
> disable_irq[_nosync]()")
>
> A read operation is performed by an extra interrupt before the completion
> of a conversion. This patch fixes the issue by setting IRQ_DISABLE_UNLAZY
> flag.
>
> Signed-off-by: Masahiro Honda <honda@xxxxxxxxxxxxx>
> ---
Reviewed-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
> v4:
> - Remove the callback.
> v3:
> https://lore.kernel.org/linux-iio/20230420102316.757-1-honda@xxxxxxxxxxxxx/
> - Remove the Kconfig option.
> v2:
> https://lore.kernel.org/linux-iio/20230414102744.150-1-honda@xxxxxxxxxxxxx/
> - Rework commit message.
> - Add a new entry in the Kconfig.
> - Call irq_clear_status_flags(irq, IRQ_DISABLE_UNLAZY) when freeing the IRQ.
> v1:
> https://lore.kernel.org/linux-iio/20230306044737.862-1-honda@xxxxxxxxxxxxx/
>
> drivers/iio/adc/ad_sigma_delta.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/iio/adc/ad_sigma_delta.c
> b/drivers/iio/adc/ad_sigma_delta.c
> index d8570f6207..7e21928707 100644
> --- a/drivers/iio/adc/ad_sigma_delta.c
> +++ b/drivers/iio/adc/ad_sigma_delta.c
> @@ -584,6 +584,10 @@ static int devm_ad_sd_probe_trigger(struct device *dev,
> struct iio_dev *indio_de
> init_completion(&sigma_delta->completion);
>
> sigma_delta->irq_dis = true;
> +
> + /* the IRQ core clears IRQ_DISABLE_UNLAZY flag when freeing an IRQ */
> + irq_set_status_flags(sigma_delta->spi->irq, IRQ_DISABLE_UNLAZY);
> +
> ret = devm_request_irq(dev, sigma_delta->spi->irq,
> ad_sd_data_rdy_trig_poll,
> sigma_delta->info->irq_flags | IRQF_NO_AUTOEN,
