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Message-ID: <20241102150045.218510-3-fido_max@inbox.ru>
Date: Sat, 2 Nov 2024 18:00:43 +0300
From: Maxim Kochetkov <fido_max@...ox.ru>
To: Mark Brown <broonie@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
linux-kernel@...r.kernel.org
Cc: Maxim Kochetkov <fido_max@...ox.ru>
Subject: [PATCH] regmap-irq: Introduce ack_after_handle option
Some interrupt controllers may have simple level interrupt detection
without enable/disable functionality. Mask/unmask simply disables
interrupt signaling to the upstream chip. If we try to ack these
interrupts before handling, we will get a false interrupt with empty
status. So the only one possible way to handle this interrupts is
to ack them after handling.
Signed-off-by: Maxim Kochetkov <fido_max@...ox.ru>
---
drivers/base/regmap/regmap-irq.c | 8 +++++++-
include/linux/regmap.h | 2 ++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 7dcd2118b4d2..8ad6486fc3bd 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -479,7 +479,7 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
for (i = 0; i < data->chip->num_regs; i++) {
data->status_buf[i] &= ~data->mask_buf[i];
- if (data->status_buf[i])
+ if (!chip->ack_after_handle && data->status_buf[i])
regmap_irq_ack(data, data->status_buf[i], i);
}
@@ -491,6 +491,12 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
}
}
+ if (chip->ack_after_handle)
+ for (i = 0; i < data->chip->num_regs; i++) {
+ if (data->status_buf[i])
+ regmap_irq_ack(data, data->status_buf[i], i);
+ }
+
exit:
if (chip->handle_post_irq)
chip->handle_post_irq(chip->irq_drv_data);
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 570aa9d797b4..a6c94d2ba548 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1572,6 +1572,7 @@ struct regmap_irq_chip_data;
* @use_ack: Use @ack register even if it is zero.
* @ack_invert: Inverted ack register: cleared bits for ack.
* @clear_ack: Use this to set 1 and 0 or vice-versa to clear interrupts.
+ * @ack_after_handle: Use this to ack interrupts after handling.
* @status_invert: Inverted status register: cleared bits are active interrupts.
* @wake_invert: Inverted wake register: cleared bits are wake enabled.
* @type_in_mask: Use the mask registers for controlling irq type. Use this if
@@ -1635,6 +1636,7 @@ struct regmap_irq_chip {
unsigned int use_ack:1;
unsigned int ack_invert:1;
unsigned int clear_ack:1;
+ unsigned int ack_after_handle:1;
unsigned int status_invert:1;
unsigned int wake_invert:1;
unsigned int type_in_mask:1;
--
2.45.2
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