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")
Signed-off-by: Masahiro Honda <[email protected]>
---
v5:
- Fix the patch title.
- Add fixes tags.
- Add information about behavior to the commit message.
v4: https://lore.kernel.org/linux-iio/[email protected]/
- Remove the callback.
v3: https://lore.kernel.org/linux-iio/[email protected]/
- Remove the Kconfig option.
v2: https://lore.kernel.org/linux-iio/[email protected]/
- 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/[email protected]/
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,
--
2.34.1
On Thu, 18 May 2023 20:08:16 +0900
Masahiro Honda <[email protected]> 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 <[email protected]>
> ---
> v5:
> - Fix the patch title.
> - Add fixes tags.
> - Add information about behavior to the commit message.
> v4: https://lore.kernel.org/linux-iio/[email protected]/
> - Remove the callback.
> v3: https://lore.kernel.org/linux-iio/[email protected]/
> - Remove the Kconfig option.
> v2: https://lore.kernel.org/linux-iio/[email protected]/
> - 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/[email protected]/
>
> 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,
On Sun, May 21, 2023 at 12:21 AM Jonathan Cameron <[email protected]> wrote:
>
> On Thu, 18 May 2023 20:08:16 +0900
> Masahiro Honda <[email protected]> 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
Sorry. I made mistakes. Thanks for fixing them.
Regards,
Masahiro
> Applied to the fixes-togreg branch of iio.git and marked for stable.
>
> Thanks,
>
> Jonathan
>
> > Signed-off-by: Masahiro Honda <[email protected]>
> > ---
> > v5:
> > - Fix the patch title.
> > - Add fixes tags.
> > - Add information about behavior to the commit message.
> > v4: https://lore.kernel.org/linux-iio/[email protected]/
> > - Remove the callback.
> > v3: https://lore.kernel.org/linux-iio/[email protected]/
> > - Remove the Kconfig option.
> > v2: https://lore.kernel.org/linux-iio/[email protected]/
> > - 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/[email protected]/
> >
> > 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,
>