1 files changed, 56 insertions, 13 deletions

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 39f2f9035c11..609ed16ae933 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -7,6 +7,7 @@
  *          Mika Westerberg <mika.westerberg@linux.intel.com>
  */
 
+#include <linux/dmi.h>
 #include <linux/errno.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
@@ -18,6 +19,12 @@
 #include <linux/pinctrl/pinctrl.h>
 
 #include "gpiolib.h"
+#include "gpiolib-acpi.h"
+
+static int run_edge_events_on_boot = -1;
+module_param(run_edge_events_on_boot, int, 0444);
+MODULE_PARM_DESC(run_edge_events_on_boot,
+		 "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");
 
 /**
  * struct acpi_gpio_event - ACPI GPIO event handler data
@@ -170,10 +177,13 @@ static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
 	event->irq_requested = true;
 
 	/* Make sure we trigger the initial state of edge-triggered IRQs */
-	value = gpiod_get_raw_value_cansleep(event->desc);
-	if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
-	    ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
-		event->handler(event->irq, event);
+	if (run_edge_events_on_boot &&
+	    (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
+		value = gpiod_get_raw_value_cansleep(event->desc);
+		if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
+		    ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
+			event->handler(event->irq, event);
+	}
 }
 
 static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
@@ -382,6 +392,13 @@ int acpi_dev_add_driver_gpios(struct acpi_device *adev,
 }
 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
 
+void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
+{
+	if (adev)
+		adev->driver_gpios = NULL;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios);
+
 static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
 {
 	acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
@@ -720,6 +737,16 @@ static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
 	return ret ? ERR_PTR(ret) : lookup.desc;
 }
 
+static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
+				     const char *con_id)
+{
+	/* Never allow fallback if the device has properties */
+	if (acpi_dev_has_props(adev) || adev->driver_gpios)
+		return false;
+
+	return con_id == NULL;
+}
+
 struct gpio_desc *acpi_find_gpio(struct device *dev,
 				 const char *con_id,
 				 unsigned int idx,
@@ -1256,15 +1283,6 @@ int acpi_gpio_count(struct device *dev, const char *con_id)
 	return count ? count : -ENOENT;
 }
 
-bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
-{
-	/* Never allow fallback if the device has properties */
-	if (acpi_dev_has_props(adev) || adev->driver_gpios)
-		return false;
-
-	return con_id == NULL;
-}
-
 /* Run deferred acpi_gpiochip_request_irqs() */
 static int acpi_gpio_handle_deferred_request_irqs(void)
 {
@@ -1283,3 +1301,28 @@ static int acpi_gpio_handle_deferred_request_irqs(void)
 }
 /* We must use _sync so that this runs after the first deferred_probe run */
 late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
+
+static const struct dmi_system_id run_edge_events_on_boot_blacklist[] = {
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
+		}
+	},
+	{} /* Terminating entry */
+};
+
+static int acpi_gpio_setup_params(void)
+{
+	if (run_edge_events_on_boot < 0) {
+		if (dmi_check_system(run_edge_events_on_boot_blacklist))
+			run_edge_events_on_boot = 0;
+		else
+			run_edge_events_on_boot = 1;
+	}
+
+	return 0;
+}
+
+/* Directly after dmi_setup() which runs as core_initcall() */
+postcore_initcall(acpi_gpio_setup_params);