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 <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,
--
2.34.1
