This is a note to let you know that I've just added the patch titled
gpio: dwapb: mask/unmask IRQ when disable/enale it
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
gpio-dwapb-mask-unmask-irq-when-disable-enale-it.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1cc3542c76acb5f59001e3e562eba672f1983355 Mon Sep 17 00:00:00 2001
From: xiongxin <xiongxin@xxxxxxxxxx>
Date: Wed, 20 Dec 2023 10:29:01 +0800
Subject: gpio: dwapb: mask/unmask IRQ when disable/enale it
From: xiongxin <xiongxin@xxxxxxxxxx>
commit 1cc3542c76acb5f59001e3e562eba672f1983355 upstream.
In the hardware implementation of the I2C HID driver based on DesignWare
GPIO IRQ chip, when the user continues to use the I2C HID device in the
suspend process, the I2C HID interrupt will be masked after the resume
process is finished.
This is because the disable_irq()/enable_irq() of the DesignWare GPIO
driver does not synchronize the IRQ mask register state. In normal use
of the I2C HID procedure, the GPIO IRQ irq_mask()/irq_unmask() functions
are called in pairs. In case of an exception, i2c_hid_core_suspend()
calls disable_irq() to disable the GPIO IRQ. With low probability, this
causes irq_unmask() to not be called, which causes the GPIO IRQ to be
masked and not unmasked in enable_irq(), raising an exception.
Add synchronization to the masked register state in the
dwapb_irq_enable()/dwapb_irq_disable() function. mask the GPIO IRQ
before disabling it. After enabling the GPIO IRQ, unmask the IRQ.
Fixes: 7779b3455697 ("gpio: add a driver for the Synopsys DesignWare APB GPIO block")
Cc: stable@xxxxxxxxxx
Co-developed-by: Riwen Lu <luriwen@xxxxxxxxxx>
Signed-off-by: Riwen Lu <luriwen@xxxxxxxxxx>
Signed-off-by: xiongxin <xiongxin@xxxxxxxxxx>
Acked-by: Serge Semin <fancer.lancer@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy@xxxxxxxxxx>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpio/gpio-dwapb.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -277,13 +277,15 @@ static void dwapb_irq_enable(struct irq_
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
- val = dwapb_read(gpio, GPIO_INTEN);
- val |= BIT(irqd_to_hwirq(d));
+ val = dwapb_read(gpio, GPIO_INTEN) | BIT(hwirq);
dwapb_write(gpio, GPIO_INTEN, val);
+ val = dwapb_read(gpio, GPIO_INTMASK) & ~BIT(hwirq);
+ dwapb_write(gpio, GPIO_INTMASK, val);
raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
}
@@ -291,12 +293,14 @@ static void dwapb_irq_disable(struct irq
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
- val = dwapb_read(gpio, GPIO_INTEN);
- val &= ~BIT(irqd_to_hwirq(d));
+ val = dwapb_read(gpio, GPIO_INTMASK) | BIT(hwirq);
+ dwapb_write(gpio, GPIO_INTMASK, val);
+ val = dwapb_read(gpio, GPIO_INTEN) & ~BIT(hwirq);
dwapb_write(gpio, GPIO_INTEN, val);
raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
}
Patches currently in stable-queue which might be from xiongxin@xxxxxxxxxx are
queue-5.15/gpio-dwapb-mask-unmask-irq-when-disable-enale-it.patch
