On Thu, 18 May 2023 20:08:16 +0900
Masahiro Honda <honda@xxxxxxxxxxxxx> 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. At this time, the value read from the ADC data register
> is the same as the previous conversion result. This patch fixes the issue
> by setting IRQ_DISABLE_UNLAZY flag.
>
> Fixes: 0c6ef985a1f ("iio: adc: ad7791: fix IRQ flags")
> Fixes: 1a913270e57 ("iio: adc: ad7793: Fix IRQ flag")
> Fixes: e081102f307 ("iio: adc: ad7780: Fix IRQ flag")
> Fixes: 89a86da5cb8 ("iio: adc: ad7192: Add IRQ flag")
> Fixes: 79ef91493f5 ("iio: adc: ad7124: Set IRQ type to falling")
All the fixes tags have 11 chars of the hash, needs to be 12. I fixed that up whilst applying
Applied to the fixes-togreg branch of iio.git and marked for stable.
Thanks,
Jonathan
> Signed-off-by: Masahiro Honda <honda@xxxxxxxxxxxxx>
> ---
> v5:
> - Fix the patch title.
> - Add fixes tags.
> - Add information about behavior to the commit message.
> v4: https://lore.kernel.org/linux-iio/20230502102930.773-1-honda@xxxxxxxxxxxxx/
> - 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 d8570f62078..7e219287074 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,
