From: Masahiro Honda <honda@mechatrax.com>
To: Lars-Peter Clausen <lars@metafoo.de>,
Michael Hennerich <Michael.Hennerich@analog.com>,
Jonathan Cameron <jic23@kernel.org>
Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
Masahiro Honda <honda@mechatrax.com>
Subject: [PATCH v5] iio: adc: ad_sigma_delta: Fix IRQ issue by setting IRQ_DISABLE_UNLAZY flag
Date: Thu, 18 May 2023 20:08:16 +0900 [thread overview]
Message-ID: <20230518110816.248-1-honda@mechatrax.com> (raw)
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@mechatrax.com>
---
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@mechatrax.com/
- Remove the callback.
v3: https://lore.kernel.org/linux-iio/20230420102316.757-1-honda@mechatrax.com/
- Remove the Kconfig option.
v2: https://lore.kernel.org/linux-iio/20230414102744.150-1-honda@mechatrax.com/
- 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@mechatrax.com/
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
next reply other threads:[~2023-05-18 11:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-18 11:08 Masahiro Honda [this message]
2023-05-20 15:38 ` [PATCH v5] iio: adc: ad_sigma_delta: Fix IRQ issue by setting IRQ_DISABLE_UNLAZY flag Jonathan Cameron
2023-05-22 11:00 ` Masahiro Honda
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230518110816.248-1-honda@mechatrax.com \
--to=honda@mechatrax.com \
--cc=Michael.Hennerich@analog.com \
--cc=jic23@kernel.org \
--cc=lars@metafoo.de \
--cc=linux-iio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.