Merge tag 'gpio-v4.18-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio
Pull GPIO fix from Linus Walleij:
"This is a single fix affecting X86 ACPI, and as such pretty important.
It is going to stable as well and have all the high-notch x86 platform
developers agreeing on it"
* tag 'gpio-v4.18-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
gpiolib-acpi: make sure we trigger edge events at least once on boot
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index e2232cb..addd9fe 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -25,6 +25,7 @@
struct acpi_gpio_event {
struct list_head node;
+ struct list_head initial_sync_list;
acpi_handle handle;
unsigned int pin;
unsigned int irq;
@@ -50,6 +51,9 @@
struct list_head events;
};
+static LIST_HEAD(acpi_gpio_initial_sync_list);
+static DEFINE_MUTEX(acpi_gpio_initial_sync_list_lock);
+
static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
{
if (!gc->parent)
@@ -85,6 +89,21 @@
return gpiochip_get_desc(chip, pin);
}
+static void acpi_gpio_add_to_initial_sync_list(struct acpi_gpio_event *event)
+{
+ mutex_lock(&acpi_gpio_initial_sync_list_lock);
+ list_add(&event->initial_sync_list, &acpi_gpio_initial_sync_list);
+ mutex_unlock(&acpi_gpio_initial_sync_list_lock);
+}
+
+static void acpi_gpio_del_from_initial_sync_list(struct acpi_gpio_event *event)
+{
+ mutex_lock(&acpi_gpio_initial_sync_list_lock);
+ if (!list_empty(&event->initial_sync_list))
+ list_del_init(&event->initial_sync_list);
+ mutex_unlock(&acpi_gpio_initial_sync_list_lock);
+}
+
static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
{
struct acpi_gpio_event *event = data;
@@ -136,7 +155,7 @@
irq_handler_t handler = NULL;
struct gpio_desc *desc;
unsigned long irqflags;
- int ret, pin, irq;
+ int ret, pin, irq, value;
if (!acpi_gpio_get_irq_resource(ares, &agpio))
return AE_OK;
@@ -167,6 +186,8 @@
gpiod_direction_input(desc);
+ value = gpiod_get_value(desc);
+
ret = gpiochip_lock_as_irq(chip, pin);
if (ret) {
dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
@@ -208,6 +229,7 @@
event->irq = irq;
event->pin = pin;
event->desc = desc;
+ INIT_LIST_HEAD(&event->initial_sync_list);
ret = request_threaded_irq(event->irq, NULL, handler, irqflags,
"ACPI:Event", event);
@@ -222,6 +244,18 @@
enable_irq_wake(irq);
list_add_tail(&event->node, &acpi_gpio->events);
+
+ /*
+ * Make sure we trigger the initial state of the IRQ when using RISING
+ * or FALLING. Note we run the handlers on late_init, the AML code
+ * may refer to OperationRegions from other (builtin) drivers which
+ * may be probed after us.
+ */
+ if (handler == acpi_gpio_irq_handler &&
+ (((irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
+ ((irqflags & IRQF_TRIGGER_FALLING) && value == 0)))
+ acpi_gpio_add_to_initial_sync_list(event);
+
return AE_OK;
fail_free_event:
@@ -294,6 +328,8 @@
list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
struct gpio_desc *desc;
+ acpi_gpio_del_from_initial_sync_list(event);
+
if (irqd_is_wakeup_set(irq_get_irq_data(event->irq)))
disable_irq_wake(event->irq);
@@ -1158,3 +1194,21 @@
return con_id == NULL;
}
+
+/* Sync the initial state of handlers after all builtin drivers have probed */
+static int acpi_gpio_initial_sync(void)
+{
+ struct acpi_gpio_event *event, *ep;
+
+ mutex_lock(&acpi_gpio_initial_sync_list_lock);
+ list_for_each_entry_safe(event, ep, &acpi_gpio_initial_sync_list,
+ initial_sync_list) {
+ acpi_evaluate_object(event->handle, NULL, NULL, NULL);
+ list_del_init(&event->initial_sync_list);
+ }
+ mutex_unlock(&acpi_gpio_initial_sync_list_lock);
+
+ return 0;
+}
+/* We must use _sync so that this runs after the first deferred_probe run */
+late_initcall_sync(acpi_gpio_initial_sync);
